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
|
import pickle
import pytest
from pyrsistent import plist, l
def test_literalish_works():
assert l(1, 2, 3) == plist([1, 2, 3])
def test_first_and_rest():
pl = plist([1, 2])
assert pl.first == 1
assert pl.rest.first == 2
assert pl.rest.rest is plist()
def test_instantiate_large_list():
assert plist(range(1000)).first == 0
def test_iteration():
assert list(plist()) == []
assert list(plist([1, 2, 3])) == [1, 2, 3]
def test_cons():
assert plist([1, 2, 3]).cons(0) == plist([0, 1, 2, 3])
def test_cons_empty_list():
assert plist().cons(0) == plist([0])
def test_truthiness():
assert plist([1])
assert not plist()
def test_len():
assert len(plist([1, 2, 3])) == 3
assert len(plist()) == 0
def test_first_illegal_on_empty_list():
with pytest.raises(AttributeError):
plist().first
def test_rest_return_self_on_empty_list():
assert plist().rest is plist()
def test_reverse():
assert plist([1, 2, 3]).reverse() == plist([3, 2, 1])
assert reversed(plist([1, 2, 3])) == plist([3, 2, 1])
assert plist().reverse() == plist()
assert reversed(plist()) == plist()
def test_inequality():
assert plist([1, 2]) != plist([1, 3])
assert plist([1, 2]) != plist([1, 2, 3])
assert plist() != plist([1, 2, 3])
def test_repr():
assert str(plist()) == "plist([])"
assert str(plist([1, 2, 3])) == "plist([1, 2, 3])"
def test_indexing():
assert plist([1, 2, 3])[2] == 3
assert plist([1, 2, 3])[-1] == 3
def test_indexing_on_empty_list():
with pytest.raises(IndexError):
plist()[0]
def test_index_out_of_range():
with pytest.raises(IndexError):
plist([1, 2])[2]
with pytest.raises(IndexError):
plist([1, 2])[-3]
def test_index_invalid_type():
with pytest.raises(TypeError) as e:
plist([1, 2, 3])['foo'] # type: ignore
assert 'cannot be interpreted' in str(e.value)
def test_slicing_take():
assert plist([1, 2, 3])[:2] == plist([1, 2])
def test_slicing_take_out_of_range():
assert plist([1, 2, 3])[:20] == plist([1, 2, 3])
def test_slicing_drop():
li = plist([1, 2, 3])
assert li[1:] is li.rest
def test_slicing_drop_out_of_range():
assert plist([1, 2, 3])[3:] is plist()
def test_contains():
assert 2 in plist([1, 2, 3])
assert 4 not in plist([1, 2, 3])
assert 1 not in plist()
def test_count():
assert plist([1, 2, 1]).count(1) == 2
assert plist().count(1) == 0
def test_index():
assert plist([1, 2, 3]).index(3) == 2
def test_index_item_not_found():
with pytest.raises(ValueError):
plist().index(3)
with pytest.raises(ValueError):
plist([1, 2]).index(3)
def test_pickling_empty_list():
assert pickle.loads(pickle.dumps(plist(), -1)) == plist()
def test_pickling_non_empty_list():
assert pickle.loads(pickle.dumps(plist([1, 2, 3]), -1)) == plist([1, 2, 3])
def test_comparison():
assert plist([1, 2]) < plist([1, 2, 3])
assert plist([2, 1]) > plist([1, 2, 3])
assert plist() < plist([1])
assert plist([1]) > plist()
def test_comparison_with_other_type():
assert plist() != []
def test_hashing():
assert hash(plist([1, 2])) == hash(plist([1, 2]))
assert hash(plist([1, 2])) != hash(plist([2, 1]))
def test_split():
left_list, right_list = plist([1, 2, 3, 4, 5]).split(3)
assert left_list == plist([1, 2, 3])
assert right_list == plist([4, 5])
def test_split_no_split_occurred():
x = plist([1, 2])
left_list, right_list = x.split(2)
assert left_list is x
assert right_list is plist()
def test_split_empty_list():
left_list, right_list = plist().split(2)
assert left_list == plist()
assert right_list == plist()
def test_remove():
assert plist([1, 2, 3, 2]).remove(2) == plist([1, 3, 2])
assert plist([1, 2, 3]).remove(1) == plist([2, 3])
assert plist([1, 2, 3]).remove(3) == plist([1, 2])
def test_remove_missing_element():
with pytest.raises(ValueError):
plist([1, 2]).remove(3)
with pytest.raises(ValueError):
plist().remove(2)
def test_mcons():
assert plist([1, 2]).mcons([3, 4]) == plist([4, 3, 1, 2])
def test_supports_weakref():
import weakref
weakref.ref(plist())
weakref.ref(plist([1, 2]))
def test_iterable():
"""
PLists can be created from iterables even though they can't be len()
hinted.
"""
assert plist(iter("a")) == plist(iter("a"))
|
