File: mocker.py

package info (click to toggle)
mocker 1.0-2
  • links: PTS, VCS
  • area: main
  • in suites: buster, jessie, jessie-kfreebsd, sid, stretch, wheezy
  • size: 316 kB
  • ctags: 956
  • sloc: python: 4,548; makefile: 11
file content (2155 lines) | stat: -rw-r--r-- 78,755 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
"""
Mocker

Graceful platform for test doubles in Python: mocks, stubs, fakes, and dummies.

Copyright (c) 2007-2010, Gustavo Niemeyer <gustavo@niemeyer.net>

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name of the copyright holder nor the names of its
      contributors may be used to endorse or promote products derived from
      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""
import __builtin__
import tempfile
import unittest
import inspect
import shutil
import types
import sys
import os
import gc


if sys.version_info < (2, 4):
    from sets import Set as set # pragma: nocover


__all__ = ["Mocker", "Expect", "expect", "IS", "CONTAINS", "IN", "MATCH",
           "ANY", "ARGS", "KWARGS", "MockerTestCase"]


__author__ = "Gustavo Niemeyer <gustavo@niemeyer.net>"
__license__ = "BSD"
__version__ = "1.0"


ERROR_PREFIX = "[Mocker] "


# --------------------------------------------------------------------
# Exceptions

class MatchError(AssertionError):
    """Raised when an unknown expression is seen in playback mode."""


# --------------------------------------------------------------------
# Helper for chained-style calling.

class expect(object):
    """This is a simple helper that allows a different call-style.

    With this class one can comfortably do chaining of calls to the
    mocker object responsible by the object being handled. For instance::

        expect(obj.attr).result(3).count(1, 2)

    Is the same as::

        obj.attr
        mocker.result(3)
        mocker.count(1, 2)

    """

    __mocker__ = None

    def __init__(self, mock, attr=None):
        self._mock = mock
        self._attr = attr

    def __getattr__(self, attr):
        return self.__class__(self._mock, attr)

    def __call__(self, *args, **kwargs):
        mocker = self.__mocker__
        if not mocker:
            mocker = self._mock.__mocker__
        getattr(mocker, self._attr)(*args, **kwargs)
        return self


def Expect(mocker):
    """Create an expect() "function" using the given Mocker instance.

    This helper allows defining an expect() "function" which works even
    in trickier cases such as:

        expect = Expect(mymocker)
        expect(iter(mock)).generate([1, 2, 3])

    """
    return type("Expect", (expect,), {"__mocker__": mocker})


# --------------------------------------------------------------------
# Extensions to Python's unittest.

class MockerTestCase(unittest.TestCase):
    """unittest.TestCase subclass with Mocker support.

    @ivar mocker: The mocker instance.

    This is a convenience only.  Mocker may easily be used with the
    standard C{unittest.TestCase} class if wanted.

    Test methods have a Mocker instance available on C{self.mocker}.
    At the end of each test method, expectations of the mocker will
    be verified, and any requested changes made to the environment
    will be restored.

    In addition to the integration with Mocker, this class provides
    a few additional helper methods.
    """

    def __init__(self, methodName="runTest"):
        # So here is the trick: we take the real test method, wrap it on
        # a function that do the job we have to do, and insert it in the
        # *instance* dictionary, so that getattr() will return our
        # replacement rather than the class method.
        test_method = getattr(self, methodName, None)
        if test_method is not None:
            def test_method_wrapper():
                try:
                    result = test_method()
                except:
                    raise
                else:
                    if (self.mocker.is_recording() and
                        self.mocker.get_events()):
                        raise RuntimeError("Mocker must be put in replay "
                                           "mode with self.mocker.replay()")
                    if (hasattr(result, "addCallback") and
                        hasattr(result, "addErrback")):
                        def verify(result):
                            self.mocker.verify()
                            return result
                        result.addCallback(verify)
                    else:
                        self.mocker.verify()
                        self.mocker.restore()
                    return result
            # Copy all attributes from the original method..
            for attr in dir(test_method):
                # .. unless they're present in our wrapper already.
                if not hasattr(test_method_wrapper, attr) or attr == "__doc__":
                    setattr(test_method_wrapper, attr,
                            getattr(test_method, attr))
            setattr(self, methodName, test_method_wrapper)

        # We could overload run() normally, but other well-known testing
        # frameworks do it as well, and some of them won't call the super,
        # which might mean that cleanup wouldn't happen.  With that in mind,
        # we make integration easier by using the following trick.
        run_method = self.run
        def run_wrapper(*args, **kwargs):
            try:
                return run_method(*args, **kwargs)
            finally:
                self.__cleanup()
        self.run = run_wrapper

        self.mocker = Mocker()
        self.expect = Expect(self.mocker)

        self.__cleanup_funcs = []
        self.__cleanup_paths = []

        super(MockerTestCase, self).__init__(methodName)

    def __call__(self, *args, **kwargs):
        # This is necessary for Python 2.3 only, because it didn't use run(),
        # which is supported above.
        try:
            super(MockerTestCase, self).__call__(*args, **kwargs)
        finally:
            if sys.version_info < (2, 4):
                self.__cleanup()

    def __cleanup(self):
        for path in self.__cleanup_paths:
            if os.path.isfile(path):
                os.unlink(path)
            elif os.path.isdir(path):
                shutil.rmtree(path)
        self.mocker.reset()
        for func, args, kwargs in self.__cleanup_funcs:
            func(*args, **kwargs)

    def addCleanup(self, func, *args, **kwargs):
        self.__cleanup_funcs.append((func, args, kwargs))

    def makeFile(self, content=None, suffix="", prefix="tmp", basename=None,
                 dirname=None, path=None):
        """Create a temporary file and return the path to it.

        @param content: Initial content for the file.
        @param suffix: Suffix to be given to the file's basename.
        @param prefix: Prefix to be given to the file's basename.
        @param basename: Full basename for the file.
        @param dirname: Put file inside this directory.

        The file is removed after the test runs.
        """
        if path is not None:
            self.__cleanup_paths.append(path)
        elif basename is not None:
            if dirname is None:
                dirname = tempfile.mkdtemp()
                self.__cleanup_paths.append(dirname)
            path = os.path.join(dirname, basename)
        else:
            fd, path = tempfile.mkstemp(suffix, prefix, dirname)
            self.__cleanup_paths.append(path)
            os.close(fd)
            if content is None:
                os.unlink(path)
        if content is not None:
            file = open(path, "w")
            file.write(content)
            file.close()
        return path

    def makeDir(self, suffix="", prefix="tmp", dirname=None, path=None):
        """Create a temporary directory and return the path to it.

        @param suffix: Suffix to be given to the file's basename.
        @param prefix: Prefix to be given to the file's basename.
        @param dirname: Put directory inside this parent directory.

        The directory is removed after the test runs.
        """
        if path is not None:
            os.makedirs(path)
        else:
            path = tempfile.mkdtemp(suffix, prefix, dirname)
        self.__cleanup_paths.append(path)
        return path

    def failUnlessIs(self, first, second, msg=None):
        """Assert that C{first} is the same object as C{second}."""
        if first is not second:
            raise self.failureException(msg or "%r is not %r" % (first, second))

    def failIfIs(self, first, second, msg=None):
        """Assert that C{first} is not the same object as C{second}."""
        if first is second:
            raise self.failureException(msg or "%r is %r" % (first, second))

    def failUnlessIn(self, first, second, msg=None):
        """Assert that C{first} is contained in C{second}."""
        if first not in second:
            raise self.failureException(msg or "%r not in %r" % (first, second))

    def failUnlessStartsWith(self, first, second, msg=None):
        """Assert that C{first} starts with C{second}."""
        if first[:len(second)] != second:
            raise self.failureException(msg or "%r doesn't start with %r" %
                                               (first, second))

    def failIfStartsWith(self, first, second, msg=None):
        """Assert that C{first} doesn't start with C{second}."""
        if first[:len(second)] == second:
            raise self.failureException(msg or "%r starts with %r" %
                                               (first, second))

    def failUnlessEndsWith(self, first, second, msg=None):
        """Assert that C{first} starts with C{second}."""
        if first[len(first)-len(second):] != second:
            raise self.failureException(msg or "%r doesn't end with %r" %
                                               (first, second))

    def failIfEndsWith(self, first, second, msg=None):
        """Assert that C{first} doesn't start with C{second}."""
        if first[len(first)-len(second):] == second:
            raise self.failureException(msg or "%r ends with %r" %
                                               (first, second))

    def failIfIn(self, first, second, msg=None):
        """Assert that C{first} is not contained in C{second}."""
        if first in second:
            raise self.failureException(msg or "%r in %r" % (first, second))

    def failUnlessApproximates(self, first, second, tolerance, msg=None):
        """Assert that C{first} is near C{second} by at most C{tolerance}."""
        if abs(first - second) > tolerance:
            raise self.failureException(msg or "abs(%r - %r) > %r" %
                                        (first, second, tolerance))

    def failIfApproximates(self, first, second, tolerance, msg=None):
        """Assert that C{first} is far from C{second} by at least C{tolerance}.
        """
        if abs(first - second) <= tolerance:
            raise self.failureException(msg or "abs(%r - %r) <= %r" %
                                        (first, second, tolerance))

    def failUnlessMethodsMatch(self, first, second):
        """Assert that public methods in C{first} are present in C{second}.

        This method asserts that all public methods found in C{first} are also
        present in C{second} and accept the same arguments.  C{first} may
        have its own private methods, though, and may not have all methods
        found in C{second}.  Note that if a private method in C{first} matches
        the name of one in C{second}, their specification is still compared.

        This is useful to verify if a fake or stub class have the same API as
        the real class being simulated.
        """
        first_methods = dict(inspect.getmembers(first, inspect.ismethod))
        second_methods = dict(inspect.getmembers(second, inspect.ismethod))
        for name, first_method in first_methods.iteritems():
            first_argspec = inspect.getargspec(first_method)
            first_formatted = inspect.formatargspec(*first_argspec)

            second_method = second_methods.get(name)
            if second_method is None:
                if name[:1] == "_":
                    continue # First may have its own private methods.
                raise self.failureException("%s.%s%s not present in %s" %
                    (first.__name__, name, first_formatted, second.__name__))

            second_argspec = inspect.getargspec(second_method)
            if first_argspec != second_argspec:
                second_formatted = inspect.formatargspec(*second_argspec)
                raise self.failureException("%s.%s%s != %s.%s%s" %
                    (first.__name__, name, first_formatted,
                     second.__name__, name, second_formatted))

    def failUnlessRaises(self, excClass, callableObj, *args, **kwargs):
        """
        Fail unless an exception of class excClass is thrown by callableObj
        when invoked with arguments args and keyword arguments kwargs. If a
        different type of exception is thrown, it will not be caught, and the
        test case will be deemed to have suffered an error, exactly as for an
        unexpected exception. It returns the exception instance if it matches
        the given exception class.
        """
        try:
            result = callableObj(*args, **kwargs)
        except excClass, e:
            return e
        else:
            excName = excClass
            if hasattr(excClass, "__name__"):
                excName = excClass.__name__
            raise self.failureException(
                "%s not raised (%r returned)" % (excName, result))


    assertIs = failUnlessIs
    assertIsNot = failIfIs
    assertIn = failUnlessIn
    assertNotIn = failIfIn
    assertStartsWith = failUnlessStartsWith
    assertNotStartsWith = failIfStartsWith
    assertEndsWith = failUnlessEndsWith
    assertNotEndsWith = failIfEndsWith
    assertApproximates = failUnlessApproximates
    assertNotApproximates = failIfApproximates
    assertMethodsMatch = failUnlessMethodsMatch
    assertRaises = failUnlessRaises

    # The following are missing in Python < 2.4.
    assertTrue = unittest.TestCase.failUnless
    assertFalse = unittest.TestCase.failIf

    # The following is provided for compatibility with Twisted's trial.
    assertIdentical = assertIs
    assertNotIdentical = assertIsNot
    failUnlessIdentical = failUnlessIs
    failIfIdentical = failIfIs


# --------------------------------------------------------------------
# Mocker.

class classinstancemethod(object):

    def __init__(self, method):
        self.method = method

    def __get__(self, obj, cls=None):
        def bound_method(*args, **kwargs):
            return self.method(cls, obj, *args, **kwargs)
        return bound_method


class MockerBase(object):
    """Controller of mock objects.

    A mocker instance is used to command recording and replay of
    expectations on any number of mock objects.

    Expectations should be expressed for the mock object while in
    record mode (the initial one) by using the mock object itself,
    and using the mocker (and/or C{expect()} as a helper) to define
    additional behavior for each event.  For instance::

        mock = mocker.mock()
        mock.hello()
        mocker.result("Hi!")
        mocker.replay()
        assert mock.hello() == "Hi!"
        mock.restore()
        mock.verify()

    In this short excerpt a mock object is being created, then an
    expectation of a call to the C{hello()} method was recorded, and
    when called the method should return the value C{10}.  Then, the
    mocker is put in replay mode, and the expectation is satisfied by
    calling the C{hello()} method, which indeed returns 10.  Finally,
    a call to the L{restore()} method is performed to undo any needed
    changes made in the environment, and the L{verify()} method is
    called to ensure that all defined expectations were met.

    The same logic can be expressed more elegantly using the
    C{with mocker:} statement, as follows::

        mock = mocker.mock()
        mock.hello()
        mocker.result("Hi!")
        with mocker:
            assert mock.hello() == "Hi!"

    Also, the MockerTestCase class, which integrates the mocker on
    a unittest.TestCase subclass, may be used to reduce the overhead
    of controlling the mocker.  A test could be written as follows::

        class SampleTest(MockerTestCase):

            def test_hello(self):
                mock = self.mocker.mock()
                mock.hello()
                self.mocker.result("Hi!")
                self.mocker.replay()
                self.assertEquals(mock.hello(), "Hi!")
    """

    _recorders = []

    # For convenience only.
    on = expect

    class __metaclass__(type):
        def __init__(self, name, bases, dict):
            # Make independent lists on each subclass, inheriting from parent.
            self._recorders = list(getattr(self, "_recorders", ()))

    def __init__(self):
        self._recorders = self._recorders[:]
        self._events = []
        self._recording = True
        self._ordering = False
        self._last_orderer = None

    def is_recording(self):
        """Return True if in recording mode, False if in replay mode.

        Recording is the initial state.
        """
        return self._recording

    def replay(self):
        """Change to replay mode, where recorded events are reproduced.

        If already in replay mode, the mocker will be restored, with all
        expectations reset, and then put again in replay mode.

        An alternative and more comfortable way to replay changes is
        using the 'with' statement, as follows::

            mocker = Mocker()
            <record events>
            with mocker:
                <reproduce events>

        The 'with' statement will automatically put mocker in replay
        mode, and will also verify if all events were correctly reproduced
        at the end (using L{verify()}), and also restore any changes done
        in the environment (with L{restore()}).

        Also check the MockerTestCase class, which integrates the
        unittest.TestCase class with mocker.
        """
        if not self._recording:
            for event in self._events:
                event.restore()
        else:
            self._recording = False
        for event in self._events:
            event.replay()

    def restore(self):
        """Restore changes in the environment, and return to recording mode.

        This should always be called after the test is complete (succeeding
        or not).  There are ways to call this method automatically on
        completion (e.g. using a C{with mocker:} statement, or using the
        L{MockerTestCase} class.
        """
        if not self._recording:
            self._recording = True
            for event in self._events:
                event.restore()

    def reset(self):
        """Reset the mocker state.

        This will restore environment changes, if currently in replay
        mode, and then remove all events previously recorded.
        """
        if not self._recording:
            self.restore()
        self.unorder()
        del self._events[:]

    def get_events(self):
        """Return all recorded events."""
        return self._events[:]

    def add_event(self, event):
        """Add an event.

        This method is used internally by the implementation, and
        shouldn't be needed on normal mocker usage.
        """
        self._events.append(event)
        if self._ordering:
            orderer = event.add_task(Orderer(event.path))
            if self._last_orderer:
                orderer.add_dependency(self._last_orderer)
            self._last_orderer = orderer
        return event

    def verify(self):
        """Check if all expectations were met, and raise AssertionError if not.

        The exception message will include a nice description of which
        expectations were not met, and why.
        """
        errors = []
        for event in self._events:
            try:
                event.verify()
            except AssertionError, e:
                error = str(e)
                if not error:
                    raise RuntimeError("Empty error message from %r"
                                       % event)
                errors.append(error)
        if errors:
            message = [ERROR_PREFIX + "Unmet expectations:", ""]
            for error in errors:
                lines = error.splitlines()
                message.append("=> " + lines.pop(0))
                message.extend([" " + line for line in lines])
                message.append("")
            raise AssertionError(os.linesep.join(message))

    def mock(self, spec_and_type=None, spec=None, type=None,
             name=None, count=True):
        """Return a new mock object.

        @param spec_and_type: Handy positional argument which sets both
                     spec and type.
        @param spec: Method calls will be checked for correctness against
                     the given class.
        @param type: If set, the Mock's __class__ attribute will return
                     the given type.  This will make C{isinstance()} calls
                     on the object work.
        @param name: Name for the mock object, used in the representation of
                     expressions.  The name is rarely needed, as it's usually
                     guessed correctly from the variable name used.
        @param count: If set to false, expressions may be executed any number
                     of times, unless an expectation is explicitly set using
                     the L{count()} method.  By default, expressions are
                     expected once.
        """
        if spec_and_type is not None:
            spec = type = spec_and_type
        return Mock(self, spec=spec, type=type, name=name, count=count)

    def proxy(self, object, spec=True, type=True, name=None, count=True,
              passthrough=True):
        """Return a new mock object which proxies to the given object.
 
        Proxies are useful when only part of the behavior of an object
        is to be mocked.  Unknown expressions may be passed through to
        the real implementation implicitly (if the C{passthrough} argument
        is True), or explicitly (using the L{passthrough()} method
        on the event).

        @param object: Real object to be proxied, and replaced by the mock
                       on replay mode.  It may also be an "import path",
                       such as C{"time.time"}, in which case the object
                       will be the C{time} function from the C{time} module.
        @param spec: Method calls will be checked for correctness against
                     the given object, which may be a class or an instance
                     where attributes will be looked up.  Defaults to the
                     the C{object} parameter.  May be set to None explicitly,
                     in which case spec checking is disabled.  Checks may
                     also be disabled explicitly on a per-event basis with
                     the L{nospec()} method.
        @param type: If set, the Mock's __class__ attribute will return
                     the given type.  This will make C{isinstance()} calls
                     on the object work.  Defaults to the type of the
                     C{object} parameter.  May be set to None explicitly.
        @param name: Name for the mock object, used in the representation of
                     expressions.  The name is rarely needed, as it's usually
                     guessed correctly from the variable name used.
        @param count: If set to false, expressions may be executed any number
                     of times, unless an expectation is explicitly set using
                     the L{count()} method.  By default, expressions are
                     expected once.
        @param passthrough: If set to False, passthrough of actions on the
                            proxy to the real object will only happen when
                            explicitly requested via the L{passthrough()}
                            method.
        """
        if isinstance(object, basestring):
            if name is None:
                name = object
            import_stack = object.split(".")
            attr_stack = []
            while import_stack:
                module_path = ".".join(import_stack)
                try:
                    __import__(module_path)
                except ImportError:
                    attr_stack.insert(0, import_stack.pop())
                    if not import_stack:
                        raise
                    continue
                else:
                    object = sys.modules[module_path]
                    for attr in attr_stack:
                        object = getattr(object, attr)
                    break
        if isinstance(object, types.UnboundMethodType):
            object = object.im_func
        if spec is True:
            spec = object
        if type is True:
            type = __builtin__.type(object)
        return Mock(self, spec=spec, type=type, object=object,
                    name=name, count=count, passthrough=passthrough)

    def replace(self, object, spec=True, type=True, name=None, count=True,
                passthrough=True):
        """Create a proxy, and replace the original object with the mock.

        On replay, the original object will be replaced by the returned
        proxy in all dictionaries found in the running interpreter via
        the garbage collecting system.  This should cover module
        namespaces, class namespaces, instance namespaces, and so on.

        @param object: Real object to be proxied, and replaced by the mock
                       on replay mode.  It may also be an "import path",
                       such as C{"time.time"}, in which case the object
                       will be the C{time} function from the C{time} module.
        @param spec: Method calls will be checked for correctness against
                     the given object, which may be a class or an instance
                     where attributes will be looked up.  Defaults to the
                     the C{object} parameter.  May be set to None explicitly,
                     in which case spec checking is disabled.  Checks may
                     also be disabled explicitly on a per-event basis with
                     the L{nospec()} method.
        @param type: If set, the Mock's __class__ attribute will return
                     the given type.  This will make C{isinstance()} calls
                     on the object work.  Defaults to the type of the
                     C{object} parameter.  May be set to None explicitly.
        @param name: Name for the mock object, used in the representation of
                     expressions.  The name is rarely needed, as it's usually
                     guessed correctly from the variable name used.
        @param passthrough: If set to False, passthrough of actions on the
                            proxy to the real object will only happen when
                            explicitly requested via the L{passthrough()}
                            method.
        """
        mock = self.proxy(object, spec, type, name, count, passthrough)
        event = self._get_replay_restore_event()
        event.add_task(ProxyReplacer(mock))
        return mock

    def patch(self, object, spec=True):
        """Patch an existing object to reproduce recorded events.

        @param object: Class or instance to be patched.
        @param spec: Method calls will be checked for correctness against
                     the given object, which may be a class or an instance
                     where attributes will be looked up.  Defaults to the
                     the C{object} parameter.  May be set to None explicitly,
                     in which case spec checking is disabled.  Checks may
                     also be disabled explicitly on a per-event basis with
                     the L{nospec()} method.

        The result of this method is still a mock object, which can be
        used like any other mock object to record events.  The difference
        is that when the mocker is put on replay mode, the *real* object
        will be modified to behave according to recorded expectations.

        Patching works in individual instances, and also in classes.
        When an instance is patched, recorded events will only be
        considered on this specific instance, and other instances should
        behave normally.  When a class is patched, the reproduction of
        events will be considered on any instance of this class once
        created (collectively).

        Observe that, unlike with proxies which catch only events done
        through the mock object, *all* accesses to recorded expectations
        will be considered;  even these coming from the object itself
        (e.g. C{self.hello()} is considered if this method was patched).
        While this is a very powerful feature, and many times the reason
        to use patches in the first place, it's important to keep this
        behavior in mind.

        Patching of the original object only takes place when the mocker
        is put on replay mode, and the patched object will be restored
        to its original state once the L{restore()} method is called
        (explicitly, or implicitly with alternative conventions, such as
        a C{with mocker:} block, or a MockerTestCase class).
        """
        if spec is True:
            spec = object
        patcher = Patcher()
        event = self._get_replay_restore_event()
        event.add_task(patcher)
        mock = Mock(self, object=object, patcher=patcher,
                    passthrough=True, spec=spec)
        patcher.patch_attr(object, '__mocker_mock__', mock)
        return mock

    def act(self, path):
        """This is called by mock objects whenever something happens to them.

        This method is part of the implementation between the mocker
        and mock objects.
        """
        if self._recording:
            event = self.add_event(Event(path))
            for recorder in self._recorders:
                recorder(self, event)
            return Mock(self, path)
        else:
            # First run events that may run, then run unsatisfied events, then
            # ones not previously run. We put the index in the ordering tuple
            # instead of the actual event because we want a stable sort
            # (ordering between 2 events is undefined).
            events = self._events
            order = [(events[i].satisfied()*2 + events[i].has_run(), i)
                     for i in range(len(events))]
            order.sort()
            postponed = None
            for weight, i in order:
                event = events[i]
                if event.matches(path):
                    if event.may_run(path):
                        return event.run(path)
                    elif postponed is None:
                        postponed = event
            if postponed is not None:
                return postponed.run(path)
            raise MatchError(ERROR_PREFIX + "Unexpected expression: %s" % path)

    def get_recorders(cls, self):
        """Return recorders associated with this mocker class or instance.

        This method may be called on mocker instances and also on mocker
        classes.  See the L{add_recorder()} method for more information.
        """
        return (self or cls)._recorders[:]
    get_recorders = classinstancemethod(get_recorders)

    def add_recorder(cls, self, recorder):
        """Add a recorder to this mocker class or instance.

        @param recorder: Callable accepting C{(mocker, event)} as parameters.

        This is part of the implementation of mocker.

        All registered recorders are called for translating events that
        happen during recording into expectations to be met once the state
        is switched to replay mode.

        This method may be called on mocker instances and also on mocker
        classes.  When called on a class, the recorder will be used by
        all instances, and also inherited on subclassing.  When called on
        instances, the recorder is added only to the given instance.
        """
        (self or cls)._recorders.append(recorder)
        return recorder
    add_recorder = classinstancemethod(add_recorder)

    def remove_recorder(cls, self, recorder):
        """Remove the given recorder from this mocker class or instance.

        This method may be called on mocker classes and also on mocker
        instances.  See the L{add_recorder()} method for more information.
        """
        (self or cls)._recorders.remove(recorder)
    remove_recorder = classinstancemethod(remove_recorder)

    def result(self, value):
        """Make the last recorded event return the given value on replay.
        
        @param value: Object to be returned when the event is replayed.
        """
        self.call(lambda *args, **kwargs: value)

    def generate(self, sequence):
        """Last recorded event will return a generator with the given sequence.

        @param sequence: Sequence of values to be generated.
        """
        def generate(*args, **kwargs):
            for value in sequence:
                yield value
        self.call(generate)

    def throw(self, exception):
        """Make the last recorded event raise the given exception on replay.

        @param exception: Class or instance of exception to be raised.
        """
        def raise_exception(*args, **kwargs):
            raise exception
        self.call(raise_exception)

    def call(self, func):
        """Make the last recorded event cause the given function to be called.

        @param func: Function to be called.

        The result of the function will be used as the event result.
        """
        self._events[-1].add_task(FunctionRunner(func))

    def count(self, min, max=False):
        """Last recorded event must be replayed between min and max times.

        @param min: Minimum number of times that the event must happen.
        @param max: Maximum number of times that the event must happen.  If
                    not given, it defaults to the same value of the C{min}
                    parameter.  If set to None, there is no upper limit, and
                    the expectation is met as long as it happens at least
                    C{min} times.
        """
        event = self._events[-1]
        for task in event.get_tasks():
            if isinstance(task, RunCounter):
                event.remove_task(task)
        event.add_task(RunCounter(min, max))

    def is_ordering(self):
        """Return true if all events are being ordered.

        See the L{order()} method.
        """
        return self._ordering

    def unorder(self):
        """Disable the ordered mode.
        
        See the L{order()} method for more information.
        """
        self._ordering = False
        self._last_orderer = None

    def order(self, *path_holders):
        """Create an expectation of order between two or more events.

        @param path_holders: Objects returned as the result of recorded events.

        By default, mocker won't force events to happen precisely in
        the order they were recorded.  Calling this method will change
        this behavior so that events will only match if reproduced in
        the correct order.

        There are two ways in which this method may be used.  Which one
        is used in a given occasion depends only on convenience.

        If no arguments are passed, the mocker will be put in a mode where
        all the recorded events following the method call will only be met
        if they happen in order.  When that's used, the mocker may be put
        back in unordered mode by calling the L{unorder()} method, or by
        using a 'with' block, like so::

            with mocker.ordered():
                <record events>

        In this case, only expressions in <record events> will be ordered,
        and the mocker will be back in unordered mode after the 'with' block.

        The second way to use it is by specifying precisely which events
        should be ordered.  As an example::

            mock = mocker.mock()
            expr1 = mock.hello()
            expr2 = mock.world
            expr3 = mock.x.y.z
            mocker.order(expr1, expr2, expr3)

        This method of ordering only works when the expression returns
        another object.

        Also check the L{after()} and L{before()} methods, which are
        alternative ways to perform this.
        """
        if not path_holders:
            self._ordering = True
            return OrderedContext(self)

        last_orderer = None
        for path_holder in path_holders:
            if type(path_holder) is Path:
                path = path_holder
            else:
                path = path_holder.__mocker_path__
            for event in self._events:
                if event.path is path:
                    for task in event.get_tasks():
                        if isinstance(task, Orderer):
                            orderer = task
                            break
                    else:
                        orderer = Orderer(path)
                        event.add_task(orderer)
                    if last_orderer:
                        orderer.add_dependency(last_orderer)
                    last_orderer = orderer
                    break

    def after(self, *path_holders):
        """Last recorded event must happen after events referred to.

        @param path_holders: Objects returned as the result of recorded events
                             which should happen before the last recorded event

        As an example, the idiom::

            expect(mock.x).after(mock.y, mock.z)

        is an alternative way to say::

            expr_x = mock.x
            expr_y = mock.y
            expr_z = mock.z
            mocker.order(expr_y, expr_x)
            mocker.order(expr_z, expr_x)

        See L{order()} for more information.
        """
        last_path = self._events[-1].path
        for path_holder in path_holders:
            self.order(path_holder, last_path)

    def before(self, *path_holders):
        """Last recorded event must happen before events referred to.

        @param path_holders: Objects returned as the result of recorded events
                             which should happen after the last recorded event

        As an example, the idiom::

            expect(mock.x).before(mock.y, mock.z)

        is an alternative way to say::

            expr_x = mock.x
            expr_y = mock.y
            expr_z = mock.z
            mocker.order(expr_x, expr_y)
            mocker.order(expr_x, expr_z)

        See L{order()} for more information.
        """
        last_path = self._events[-1].path
        for path_holder in path_holders:
            self.order(last_path, path_holder)

    def nospec(self):
        """Don't check method specification of real object on last event.

        By default, when using a mock created as the result of a call to
        L{proxy()}, L{replace()}, and C{patch()}, or when passing the spec
        attribute to the L{mock()} method, method calls on the given object
        are checked for correctness against the specification of the real
        object (or the explicitly provided spec).

        This method will disable that check specifically for the last
        recorded event.
        """
        event = self._events[-1]
        for task in event.get_tasks():
            if isinstance(task, SpecChecker):
                event.remove_task(task)

    def passthrough(self, result_callback=None):
        """Make the last recorded event run on the real object once seen.

        @param result_callback: If given, this function will be called with
            the result of the *real* method call as the only argument.

        This can only be used on proxies, as returned by the L{proxy()}
        and L{replace()} methods, or on mocks representing patched objects,
        as returned by the L{patch()} method.
        """
        event = self._events[-1]
        if event.path.root_object is None:
            raise TypeError("Mock object isn't a proxy")
        event.add_task(PathExecuter(result_callback))

    def __enter__(self):
        """Enter in a 'with' context.  This will run replay()."""
        self.replay()
        return self

    def __exit__(self, type, value, traceback):
        """Exit from a 'with' context.

        This will run restore() at all times, but will only run verify()
        if the 'with' block itself hasn't raised an exception.  Exceptions
        in that block are never swallowed.
        """
        self.restore()
        if type is None:
            self.verify()
        return False

    def _get_replay_restore_event(self):
        """Return unique L{ReplayRestoreEvent}, creating if needed.

        Some tasks only want to replay/restore.  When that's the case,
        they shouldn't act on other events during replay.  Also, they
        can all be put in a single event when that's the case.  Thus,
        we add a single L{ReplayRestoreEvent} as the first element of
        the list.
        """
        if not self._events or type(self._events[0]) != ReplayRestoreEvent:
            self._events.insert(0, ReplayRestoreEvent())
        return self._events[0]


class OrderedContext(object):

    def __init__(self, mocker):
        self._mocker = mocker

    def __enter__(self):
        return None

    def __exit__(self, type, value, traceback):
        self._mocker.unorder()


class Mocker(MockerBase):
    __doc__ = MockerBase.__doc__

# Decorator to add recorders on the standard Mocker class.
recorder = Mocker.add_recorder


# --------------------------------------------------------------------
# Mock object.

class Mock(object):

    def __init__(self, mocker, path=None, name=None, spec=None, type=None,
                 object=None, passthrough=False, patcher=None, count=True):
        self.__mocker__ = mocker
        self.__mocker_path__ = path or Path(self, object)
        self.__mocker_name__ = name
        self.__mocker_spec__ = spec
        self.__mocker_object__ = object
        self.__mocker_passthrough__ = passthrough
        self.__mocker_patcher__ = patcher
        self.__mocker_replace__ = False
        self.__mocker_type__ = type
        self.__mocker_count__ = count

    def __mocker_act__(self, kind, args=(), kwargs={}, object=None):
        if self.__mocker_name__ is None:
            self.__mocker_name__ = find_object_name(self, 2)
        action = Action(kind, args, kwargs, self.__mocker_path__)
        path = self.__mocker_path__ + action
        if object is not None:
            path.root_object = object
        try:
            return self.__mocker__.act(path)
        except MatchError, exception:
            root_mock = path.root_mock
            if (path.root_object is not None and
                root_mock.__mocker_passthrough__):
                return path.execute(path.root_object)
            # Reinstantiate to show raise statement on traceback, and
            # also to make the traceback shown shorter.
            raise MatchError(str(exception))
        except AssertionError, e:
            lines = str(e).splitlines()
            message = [ERROR_PREFIX + "Unmet expectation:", ""]
            message.append("=> " + lines.pop(0))
            message.extend([" " + line for line in lines])
            message.append("")
            raise AssertionError(os.linesep.join(message))

    def __getattribute__(self, name):
        if name.startswith("__mocker_"):
            return super(Mock, self).__getattribute__(name)
        if name == "__class__":
            if self.__mocker__.is_recording() or self.__mocker_type__ is None:
                return type(self)
            return self.__mocker_type__
        if name == "__length_hint__":
            # This is used by Python 2.6+ to optimize the allocation
            # of arrays in certain cases.  Pretend it doesn't exist.
            raise AttributeError("No __length_hint__ here!")
        return self.__mocker_act__("getattr", (name,))

    def __setattr__(self, name, value):
        if name.startswith("__mocker_"):
            return super(Mock, self).__setattr__(name, value)
        return self.__mocker_act__("setattr", (name, value))

    def __delattr__(self, name):
        return self.__mocker_act__("delattr", (name,))

    def __call__(self, *args, **kwargs):
        return self.__mocker_act__("call", args, kwargs)

    def __contains__(self, value):
        return self.__mocker_act__("contains", (value,))

    def __getitem__(self, key):
        return self.__mocker_act__("getitem", (key,))

    def __setitem__(self, key, value):
        return self.__mocker_act__("setitem", (key, value))

    def __delitem__(self, key):
        return self.__mocker_act__("delitem", (key,))

    def __len__(self):
        # MatchError is turned on an AttributeError so that list() and
        # friends act properly when trying to get length hints on
        # something that doesn't offer them.
        try:
            result = self.__mocker_act__("len")
        except MatchError, e:
            raise AttributeError(str(e))
        if type(result) is Mock:
            return 0
        return result

    def __nonzero__(self):
        try:
            result = self.__mocker_act__("nonzero")
        except MatchError, e:
            return True
        if type(result) is Mock:
            return True
        return result

    def __iter__(self):
        # XXX On py3k, when next() becomes __next__(), we'll be able
        #     to return the mock itself because it will be considered
        #     an iterator (we'll be mocking __next__ as well, which we
        #     can't now).
        result = self.__mocker_act__("iter")
        if type(result) is Mock:
            return iter([])
        return result

    # When adding a new action kind here, also add support for it on
    # Action.execute() and Path.__str__().


def find_object_name(obj, depth=0):
    """Try to detect how the object is named on a previous scope."""
    try:
        frame = sys._getframe(depth+1)
    except:
        return None
    for name, frame_obj in frame.f_locals.iteritems():
        if frame_obj is obj:
            return name
    self = frame.f_locals.get("self")
    if self is not None:
        try:
            items = list(self.__dict__.iteritems())
        except:
            pass
        else:
            for name, self_obj in items:
                if self_obj is obj:
                    return name
    return None


# --------------------------------------------------------------------
# Action and path.

class Action(object):

    def __init__(self, kind, args, kwargs, path=None):
        self.kind = kind
        self.args = args
        self.kwargs = kwargs
        self.path = path
        self._execute_cache = {}

    def __repr__(self):
        if self.path is None:
            return "Action(%r, %r, %r)" % (self.kind, self.args, self.kwargs)
        return "Action(%r, %r, %r, %r)" % \
               (self.kind, self.args, self.kwargs, self.path)

    def __eq__(self, other):
        return (self.kind == other.kind and
                self.args == other.args and
                self.kwargs == other.kwargs)

    def __ne__(self, other):
        return not self.__eq__(other)

    def matches(self, other):
        return (self.kind == other.kind and
                match_params(self.args, self.kwargs, other.args, other.kwargs))

    def execute(self, object):
        # This caching scheme may fail if the object gets deallocated before
        # the action, as the id might get reused.  It's somewhat easy to fix
        # that with a weakref callback.  For our uses, though, the object
        # should never get deallocated before the action itself, so we'll
        # just keep it simple.
        if id(object) in self._execute_cache:
            return self._execute_cache[id(object)]
        execute = getattr(object, "__mocker_execute__", None)
        if execute is not None:
            result = execute(self, object)
        else:
            kind = self.kind
            if kind == "getattr":
                result = getattr(object, self.args[0])
            elif kind == "setattr":
                result = setattr(object, self.args[0], self.args[1])
            elif kind == "delattr":
                result = delattr(object, self.args[0])
            elif kind == "call":
                result = object(*self.args, **self.kwargs)
            elif kind == "contains":
                result = self.args[0] in object
            elif kind == "getitem":
                result = object[self.args[0]]
            elif kind == "setitem":
                result = object[self.args[0]] = self.args[1]
            elif kind == "delitem":
                del object[self.args[0]]
                result = None
            elif kind == "len":
                result = len(object)
            elif kind == "nonzero":
                result = bool(object)
            elif kind == "iter":
                result = iter(object)
            else:
                raise RuntimeError("Don't know how to execute %r kind." % kind)
        self._execute_cache[id(object)] = result
        return result


class Path(object):

    def __init__(self, root_mock, root_object=None, actions=()):
        self.root_mock = root_mock
        self.root_object = root_object
        self.actions = tuple(actions)
        self.__mocker_replace__ = False

    def parent_path(self):
        if not self.actions:
            return None
        return self.actions[-1].path
    parent_path = property(parent_path)
 
    def __add__(self, action):
        """Return a new path which includes the given action at the end."""
        return self.__class__(self.root_mock, self.root_object,
                              self.actions + (action,))

    def __eq__(self, other):
        """Verify if the two paths are equal.
        
        Two paths are equal if they refer to the same mock object, and
        have the actions with equal kind, args and kwargs.
        """
        if (self.root_mock is not other.root_mock or
            self.root_object is not other.root_object or
            len(self.actions) != len(other.actions)):
            return False
        for action, other_action in zip(self.actions, other.actions):
            if action != other_action:
                return False
        return True

    def matches(self, other):
        """Verify if the two paths are equivalent.
        
        Two paths are equal if they refer to the same mock object, and
        have the same actions performed on them.
        """
        if (self.root_mock is not other.root_mock or
            len(self.actions) != len(other.actions)):
            return False
        for action, other_action in zip(self.actions, other.actions):
            if not action.matches(other_action):
                return False
        return True

    def execute(self, object):
        """Execute all actions sequentially on object, and return result.
        """
        for action in self.actions:
            object = action.execute(object)
        return object

    def __str__(self):
        """Transform the path into a nice string such as obj.x.y('z')."""
        result = self.root_mock.__mocker_name__ or "<mock>"
        for action in self.actions:
            if action.kind == "getattr":
                result = "%s.%s" % (result, action.args[0])
            elif action.kind == "setattr":
                result = "%s.%s = %r" % (result, action.args[0], action.args[1])
            elif action.kind == "delattr":
                result = "del %s.%s" % (result, action.args[0])
            elif action.kind == "call":
                args = [repr(x) for x in action.args]
                items = list(action.kwargs.iteritems())
                items.sort()
                for pair in items:
                    args.append("%s=%r" % pair)
                result = "%s(%s)" % (result, ", ".join(args))
            elif action.kind == "contains":
                result = "%r in %s" % (action.args[0], result)
            elif action.kind == "getitem":
                result = "%s[%r]" % (result, action.args[0])
            elif action.kind == "setitem":
                result = "%s[%r] = %r" % (result, action.args[0],
                                          action.args[1])
            elif action.kind == "delitem":
                result = "del %s[%r]" % (result, action.args[0])
            elif action.kind == "len":
                result = "len(%s)" % result
            elif action.kind == "nonzero":
                result = "bool(%s)" % result
            elif action.kind == "iter":
                result = "iter(%s)" % result
            else:
                raise RuntimeError("Don't know how to format kind %r" %
                                   action.kind)
        return result


class SpecialArgument(object):
    """Base for special arguments for matching parameters."""

    def __init__(self, object=None):
        self.object = object

    def __repr__(self):
        if self.object is None:
            return self.__class__.__name__
        else:
            return "%s(%r)" % (self.__class__.__name__, self.object)

    def matches(self, other):
        return True

    def __eq__(self, other):
        return type(other) == type(self) and self.object == other.object


class ANY(SpecialArgument):
    """Matches any single argument."""

ANY = ANY()


class ARGS(SpecialArgument):
    """Matches zero or more positional arguments."""

ARGS = ARGS()


class KWARGS(SpecialArgument):
    """Matches zero or more keyword arguments."""

KWARGS = KWARGS()


class IS(SpecialArgument):

    def matches(self, other):
        return self.object is other

    def __eq__(self, other):
        return type(other) == type(self) and self.object is other.object


class CONTAINS(SpecialArgument):

    def matches(self, other):
        try:
            other.__contains__
        except AttributeError:
            try:
                iter(other)
            except TypeError:
                # If an object can't be iterated, and has no __contains__
                # hook, it'd blow up on the test below.  We test this in
                # advance to prevent catching more errors than we really
                # want.
                return False
        return self.object in other


class IN(SpecialArgument):

    def matches(self, other):
        return other in self.object


class MATCH(SpecialArgument):

    def matches(self, other):
        return bool(self.object(other))

    def __eq__(self, other):
        return type(other) == type(self) and self.object is other.object


def match_params(args1, kwargs1, args2, kwargs2):
    """Match the two sets of parameters, considering special parameters."""

    has_args = ARGS in args1
    has_kwargs = KWARGS in args1

    if has_kwargs:
        args1 = [arg1 for arg1 in args1 if arg1 is not KWARGS]
    elif len(kwargs1) != len(kwargs2):
        return False

    if not has_args and len(args1) != len(args2):
        return False

    # Either we have the same number of kwargs, or unknown keywords are
    # accepted (KWARGS was used), so check just the ones in kwargs1.
    for key, arg1 in kwargs1.iteritems():
        if key not in kwargs2:
            return False
        arg2 = kwargs2[key]
        if isinstance(arg1, SpecialArgument):
            if not arg1.matches(arg2):
                return False
        elif arg1 != arg2:
            return False

    # Keywords match.  Now either we have the same number of
    # arguments, or ARGS was used.  If ARGS wasn't used, arguments
    # must match one-on-one necessarily.
    if not has_args:
        for arg1, arg2 in zip(args1, args2):
            if isinstance(arg1, SpecialArgument):
                if not arg1.matches(arg2):
                    return False
            elif arg1 != arg2:
                return False
        return True

    # Easy choice. Keywords are matching, and anything on args is accepted.
    if (ARGS,) == args1:
        return True

    # We have something different there. If we don't have positional
    # arguments on the original call, it can't match.
    if not args2:
        # Unless we have just several ARGS (which is bizarre, but..).
        for arg1 in args1:
            if arg1 is not ARGS:
                return False
        return True

    # Ok, all bets are lost.  We have to actually do the more expensive
    # matching.  This is an algorithm based on the idea of the Levenshtein
    # Distance between two strings, but heavily hacked for this purpose.
    args2l = len(args2)
    if args1[0] is ARGS:
        args1 = args1[1:]
        array = [0]*args2l
    else:
        array = [1]*args2l
    for i in range(len(args1)):
        last = array[0]
        if args1[i] is ARGS:
            for j in range(1, args2l):
                last, array[j] = array[j], min(array[j-1], array[j], last)
        else:
            array[0] = i or int(args1[i] != args2[0])
            for j in range(1, args2l):
                last, array[j] = array[j], last or int(args1[i] != args2[j])
        if 0 not in array:
            return False
    if array[-1] != 0:
        return False
    return True


# --------------------------------------------------------------------
# Event and task base.

class Event(object):
    """Aggregation of tasks that keep track of a recorded action.

    An event represents something that may or may not happen while the
    mocked environment is running, such as an attribute access, or a
    method call.  The event is composed of several tasks that are
    orchestrated together to create a composed meaning for the event,
    including for which actions it should be run, what happens when it
    runs, and what's the expectations about the actions run.
    """

    def __init__(self, path=None):
        self.path = path
        self._tasks = []
        self._has_run = False

    def add_task(self, task):
        """Add a new task to this taks."""
        self._tasks.append(task)
        return task

    def remove_task(self, task):
        self._tasks.remove(task)

    def get_tasks(self):
        return self._tasks[:]

    def matches(self, path):
        """Return true if *all* tasks match the given path."""
        for task in self._tasks:
            if not task.matches(path):
                return False
        return bool(self._tasks)

    def has_run(self):
        return self._has_run

    def may_run(self, path):
        """Verify if any task would certainly raise an error if run.

        This will call the C{may_run()} method on each task and return
        false if any of them returns false.
        """
        for task in self._tasks:
            if not task.may_run(path):
                return False
        return True

    def run(self, path):
        """Run all tasks with the given action.

        @param path: The path of the expression run.

        Running an event means running all of its tasks individually and in
        order.  An event should only ever be run if all of its tasks claim to
        match the given action.

        The result of this method will be the last result of a task
        which isn't None, or None if they're all None.
        """
        self._has_run = True
        result = None
        errors = []
        for task in self._tasks:
            try:
                task_result = task.run(path)
            except AssertionError, e:
                error = str(e)
                if not error:
                    raise RuntimeError("Empty error message from %r" % task)
                errors.append(error)
            else:
                if task_result is not None:
                    result = task_result
        if errors:
            message = [str(self.path)]
            if str(path) != message[0]:
                message.append("- Run: %s" % path)
            for error in errors:
                lines = error.splitlines()
                message.append("- " + lines.pop(0))
                message.extend(["  " + line for line in lines])
            raise AssertionError(os.linesep.join(message))
        return result

    def satisfied(self):
        """Return true if all tasks are satisfied.

        Being satisfied means that there are no unmet expectations.
        """
        for task in self._tasks:
            try:
                task.verify()
            except AssertionError:
                return False
        return True

    def verify(self):
        """Run verify on all tasks.

        The verify method is supposed to raise an AssertionError if the
        task has unmet expectations, with a one-line explanation about
        why this item is unmet.  This method should be safe to be called
        multiple times without side effects.
        """
        errors = []
        for task in self._tasks:
            try:
                task.verify()
            except AssertionError, e:
                error = str(e)
                if not error:
                    raise RuntimeError("Empty error message from %r" % task)
                errors.append(error)
        if errors:
            message = [str(self.path)]
            for error in errors:
                lines = error.splitlines()
                message.append("- " + lines.pop(0))
                message.extend(["  " + line for line in lines])
            raise AssertionError(os.linesep.join(message))

    def replay(self):
        """Put all tasks in replay mode."""
        self._has_run = False
        for task in self._tasks:
            task.replay()

    def restore(self):
        """Restore the state of all tasks."""
        for task in self._tasks:
            task.restore()


class ReplayRestoreEvent(Event):
    """Helper event for tasks which need replay/restore but shouldn't match."""

    def matches(self, path):
        return False


class Task(object):
    """Element used to track one specific aspect on an event.

    A task is responsible for adding any kind of logic to an event.
    Examples of that are counting the number of times the event was
    made, verifying parameters if any, and so on.
    """

    def matches(self, path):
        """Return true if the task is supposed to be run for the given path.
        """
        return True

    def may_run(self, path):
        """Return false if running this task would certainly raise an error."""
        return True

    def run(self, path):
        """Perform the task item, considering that the given action happened.
        """

    def verify(self):
        """Raise AssertionError if expectations for this item are unmet.

        The verify method is supposed to raise an AssertionError if the
        task has unmet expectations, with a one-line explanation about
        why this item is unmet.  This method should be safe to be called
        multiple times without side effects.
        """

    def replay(self):
        """Put the task in replay mode.

        Any expectations of the task should be reset.
        """

    def restore(self):
        """Restore any environmental changes made by the task.

        Verify should continue to work after this is called.
        """


# --------------------------------------------------------------------
# Task implementations.

class OnRestoreCaller(Task):
    """Call a given callback when restoring."""

    def __init__(self, callback):
        self._callback = callback

    def restore(self):
        self._callback()


class PathMatcher(Task):
    """Match the action path against a given path."""

    def __init__(self, path):
        self.path = path

    def matches(self, path):
        return self.path.matches(path)

def path_matcher_recorder(mocker, event):
    event.add_task(PathMatcher(event.path))

Mocker.add_recorder(path_matcher_recorder)


class RunCounter(Task):
    """Task which verifies if the number of runs are within given boundaries.
    """

    def __init__(self, min, max=False):
        self.min = min
        if max is None:
            self.max = sys.maxint
        elif max is False:
            self.max = min
        else:
            self.max = max
        self._runs = 0

    def replay(self):
        self._runs = 0

    def may_run(self, path):
        return self._runs < self.max

    def run(self, path):
        self._runs += 1
        if self._runs > self.max:
            self.verify()

    def verify(self):
        if not self.min <= self._runs <= self.max:
            if self._runs < self.min:
                raise AssertionError("Performed fewer times than expected.")
            raise AssertionError("Performed more times than expected.")


class ImplicitRunCounter(RunCounter):
    """RunCounter inserted by default on any event.

    This is a way to differentiate explicitly added counters and
    implicit ones.
    """

def run_counter_recorder(mocker, event):
    """Any event may be repeated once, unless disabled by default."""
    if event.path.root_mock.__mocker_count__:
        event.add_task(ImplicitRunCounter(1))

Mocker.add_recorder(run_counter_recorder)

def run_counter_removal_recorder(mocker, event):
    """
    Events created by getattr actions which lead to other events
    may be repeated any number of times. For that, we remove implicit
    run counters of any getattr actions leading to the current one.
    """
    parent_path = event.path.parent_path
    for event in mocker.get_events()[::-1]:
        if (event.path is parent_path and
            event.path.actions[-1].kind == "getattr"):
            for task in event.get_tasks():
                if type(task) is ImplicitRunCounter:
                    event.remove_task(task)

Mocker.add_recorder(run_counter_removal_recorder)


class MockReturner(Task):
    """Return a mock based on the action path."""

    def __init__(self, mocker):
        self.mocker = mocker

    def run(self, path):
        return Mock(self.mocker, path)

def mock_returner_recorder(mocker, event):
    """Events that lead to other events must return mock objects."""
    parent_path = event.path.parent_path
    for event in mocker.get_events():
        if event.path is parent_path:
            for task in event.get_tasks():
                if isinstance(task, MockReturner):
                    break
            else:
                event.add_task(MockReturner(mocker))
            break

Mocker.add_recorder(mock_returner_recorder)


class FunctionRunner(Task):
    """Task that runs a function everything it's run.

    Arguments of the last action in the path are passed to the function,
    and the function result is also returned.
    """

    def __init__(self, func):
        self._func = func

    def run(self, path):
        action = path.actions[-1]
        return self._func(*action.args, **action.kwargs)


class PathExecuter(Task):
    """Task that executes a path in the real object, and returns the result."""

    def __init__(self, result_callback=None):
        self._result_callback = result_callback

    def get_result_callback(self):
        return self._result_callback

    def run(self, path):
        result = path.execute(path.root_object)
        if self._result_callback is not None:
            self._result_callback(result)
        return result


class Orderer(Task):
    """Task to establish an order relation between two events.

    An orderer task will only match once all its dependencies have
    been run.
    """

    def __init__(self, path):
        self.path = path
        self._run = False 
        self._dependencies = []

    def replay(self):
        self._run = False

    def has_run(self):
        return self._run

    def may_run(self, path):
        for dependency in self._dependencies:
            if not dependency.has_run():
                return False
        return True

    def run(self, path):
        for dependency in self._dependencies:
            if not dependency.has_run():
                raise AssertionError("Should be after: %s" % dependency.path)
        self._run = True

    def add_dependency(self, orderer):
        self._dependencies.append(orderer)

    def get_dependencies(self):
        return self._dependencies


class SpecChecker(Task):
    """Task to check if arguments of the last action conform to a real method.
    """

    def __init__(self, method):
        self._method = method
        self._unsupported = False

        if method:
            try:
                self._args, self._varargs, self._varkwargs, self._defaults = \
                    inspect.getargspec(method)
            except TypeError:
                self._unsupported = True
            else:
                if self._defaults is None:
                    self._defaults = ()
                if type(method) is type(self.run):
                    self._args = self._args[1:]

    def get_method(self):
        return self._method

    def _raise(self, message):
        spec = inspect.formatargspec(self._args, self._varargs,
                                     self._varkwargs, self._defaults)
        raise AssertionError("Specification is %s%s: %s" %
                             (self._method.__name__, spec, message))

    def verify(self):
        if not self._method:
            raise AssertionError("Method not found in real specification")

    def may_run(self, path):
        try:
            self.run(path)
        except AssertionError:
            return False
        return True

    def run(self, path):
        if not self._method:
            raise AssertionError("Method not found in real specification")
        if self._unsupported:
            return # Can't check it. Happens with builtin functions. :-(
        action = path.actions[-1]
        obtained_len = len(action.args)
        obtained_kwargs = action.kwargs.copy()
        nodefaults_len = len(self._args) - len(self._defaults)
        for i, name in enumerate(self._args):
            if i < obtained_len and name in action.kwargs:
                self._raise("%r provided twice" % name)
            if (i >= obtained_len and i < nodefaults_len and
                name not in action.kwargs):
                self._raise("%r not provided" % name)
            obtained_kwargs.pop(name, None)
        if obtained_len > len(self._args) and not self._varargs:
            self._raise("too many args provided")
        if obtained_kwargs and not self._varkwargs:
            self._raise("unknown kwargs: %s" % ", ".join(obtained_kwargs))

def spec_checker_recorder(mocker, event):
    spec = event.path.root_mock.__mocker_spec__
    if spec:
        actions = event.path.actions
        if len(actions) == 1:
            if actions[0].kind == "call":
                method = getattr(spec, "__call__", None)
                event.add_task(SpecChecker(method))
        elif len(actions) == 2:
            if actions[0].kind == "getattr" and actions[1].kind == "call":
                method = getattr(spec, actions[0].args[0], None)
                event.add_task(SpecChecker(method))

Mocker.add_recorder(spec_checker_recorder)


class ProxyReplacer(Task):
    """Task which installs and deinstalls proxy mocks.

    This task will replace a real object by a mock in all dictionaries
    found in the running interpreter via the garbage collecting system.
    """

    def __init__(self, mock):
        self.mock = mock
        self.__mocker_replace__ = False

    def replay(self):
        global_replace(self.mock.__mocker_object__, self.mock)

    def restore(self):
        global_replace(self.mock, self.mock.__mocker_object__)


def global_replace(remove, install):
    """Replace object 'remove' with object 'install' on all dictionaries."""
    for referrer in gc.get_referrers(remove):
        if (type(referrer) is dict and
            referrer.get("__mocker_replace__", True)):
            for key, value in list(referrer.iteritems()):
                if value is remove:
                    referrer[key] = install


class Undefined(object):

    def __repr__(self):
        return "Undefined"

Undefined = Undefined()


class Patcher(Task):

    def __init__(self):
        super(Patcher, self).__init__()
        self._monitored = {} # {kind: {id(object): object}}
        self._patched = {}

    def is_monitoring(self, obj, kind):
        monitored = self._monitored.get(kind)
        if monitored:
            if id(obj) in monitored:
                return True
            cls = type(obj)
            if issubclass(cls, type):
                cls = obj
            bases = set([id(base) for base in cls.__mro__])
            bases.intersection_update(monitored)
            return bool(bases)
        return False

    def monitor(self, obj, kind):
        if kind not in self._monitored:
            self._monitored[kind] = {}
        self._monitored[kind][id(obj)] = obj

    def patch_attr(self, obj, attr, value):
        original = obj.__dict__.get(attr, Undefined)
        self._patched[id(obj), attr] = obj, attr, original
        setattr(obj, attr, value)

    def get_unpatched_attr(self, obj, attr):
        cls = type(obj)
        if issubclass(cls, type):
            cls = obj
        result = Undefined
        for mro_cls in cls.__mro__:
            key = (id(mro_cls), attr)
            if key in self._patched:
                result = self._patched[key][2]
                if result is not Undefined:
                    break
            elif attr in mro_cls.__dict__:
                result = mro_cls.__dict__.get(attr, Undefined)
                break
        if isinstance(result, object) and hasattr(type(result), "__get__"):
            if cls is obj:
                obj = None
            return result.__get__(obj, cls)
        return result

    def _get_kind_attr(self, kind):
        if kind == "getattr":
            return "__getattribute__"
        return "__%s__" % kind

    def replay(self):
        for kind in self._monitored:
            attr = self._get_kind_attr(kind)
            seen = set()
            for obj in self._monitored[kind].itervalues():
                cls = type(obj)
                if issubclass(cls, type):
                    cls = obj
                if cls not in seen:
                    seen.add(cls)
                    unpatched = getattr(cls, attr, Undefined)
                    self.patch_attr(cls, attr,
                                    PatchedMethod(kind, unpatched,
                                                  self.is_monitoring))
                    self.patch_attr(cls, "__mocker_execute__",
                                    self.execute)

    def restore(self):
        for obj, attr, original in self._patched.itervalues():
            if original is Undefined:
                delattr(obj, attr)
            else:
                setattr(obj, attr, original)
        self._patched.clear()

    def execute(self, action, object):
        attr = self._get_kind_attr(action.kind)
        unpatched = self.get_unpatched_attr(object, attr)
        try:
            return unpatched(*action.args, **action.kwargs)
        except AttributeError:
            type, value, traceback = sys.exc_info()
            if action.kind == "getattr":
                # The normal behavior of Python is to try __getattribute__,
                # and if it raises AttributeError, try __getattr__.   We've
                # tried the unpatched __getattribute__ above, and we'll now
                # try __getattr__.
                try:
                    __getattr__ = unpatched("__getattr__")
                except AttributeError:
                    pass
                else:
                    return __getattr__(*action.args, **action.kwargs)
            raise type, value, traceback


class PatchedMethod(object):

    def __init__(self, kind, unpatched, is_monitoring):
        self._kind = kind
        self._unpatched = unpatched
        self._is_monitoring = is_monitoring

    def __get__(self, obj, cls=None):
        object = obj or cls
        if not self._is_monitoring(object, self._kind):
            return self._unpatched.__get__(obj, cls)
        def method(*args, **kwargs):
            if self._kind == "getattr" and args[0].startswith("__mocker_"):
                return self._unpatched.__get__(obj, cls)(args[0])
            mock = object.__mocker_mock__
            return mock.__mocker_act__(self._kind, args, kwargs, object)
        return method

    def __call__(self, obj, *args, **kwargs):
        # At least with __getattribute__, Python seems to use *both* the
        # descriptor API and also call the class attribute directly.  It
        # looks like an interpreter bug, or at least an undocumented
        # inconsistency.
        return self.__get__(obj)(*args, **kwargs)


def patcher_recorder(mocker, event):
    mock = event.path.root_mock
    if mock.__mocker_patcher__ and len(event.path.actions) == 1:
        patcher = mock.__mocker_patcher__
        patcher.monitor(mock.__mocker_object__, event.path.actions[0].kind)

Mocker.add_recorder(patcher_recorder)