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# -*- coding: utf-8; -*-
#
# test/helper.py
# Part of ‘dput’, a Debian package upload toolkit.
#
# This is free software, and you are welcome to redistribute it under
# certain conditions; see the end of this file for copyright
# information, grant of license, and disclaimer of warranty.
""" Helper functionality for Dput test suite. """
from __future__ import (absolute_import, unicode_literals)
import sys
if sys.version_info >= (3, 3):
import builtins
import collections.abc as collections_abc
import configparser
from io import StringIO as StringIO
import unittest
import unittest.mock as mock
elif sys.version_info >= (3, 0):
raise RuntimeError("Python 3 earlier than 3.3 is not supported.")
elif sys.version_info >= (2, 7):
# Python 2 standard library.
import __builtin__ as builtins
import collections as collections_abc
import ConfigParser as configparser
from StringIO import StringIO as BaseStringIO
# Third-party backport of Python 3 unittest improvements.
import unittest2 as unittest
# Third-party mock library.
import mock
else:
raise RuntimeError("Python earlier than 2.7 is not supported.")
import base64
import collections
import errno
import functools
import io
import itertools
import os
import os.path
import pwd
import shlex
import shutil
import signal
import subprocess
import tempfile
import time
import weakref
__metaclass__ = type
try:
# Python 2 types.
basestring
unicode
except NameError:
# Alias for Python 3 types.
basestring = str
unicode = str
def make_unique_slug(testcase):
""" Make a unique slug for the test case. """
text = base64.b64encode(
testcase.getUniqueString().encode('utf-8')
).decode('utf-8')
result = text[-30:]
return result
try:
StringIO
except NameError:
# We don't yet have the StringIO we want. Create it.
class StringIO(BaseStringIO, object):
""" StringIO with a context manager. """
def __enter__(self):
return self
def __exit__(self, *args):
self.close()
return False
def readable(self):
return True
def writable(self):
return True
def seekable(self):
return True
def patch_stdout(testcase):
""" Patch `sys.stdout` for the specified test case. """
patcher = mock.patch.object(
sys, "stdout", wraps=StringIO())
patcher.start()
testcase.addCleanup(patcher.stop)
def patch_stderr(testcase):
""" Patch `sys.stderr` for the specified test case. """
patcher = mock.patch.object(
sys, "stderr", wraps=StringIO())
patcher.start()
testcase.addCleanup(patcher.stop)
def patch_signal_signal(testcase):
""" Patch `signal.signal` for the specified test case. """
func_patcher = mock.patch.object(signal, "signal", autospec=True)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
class FakeSystemExit(Exception):
""" Fake double for `SystemExit` exception. """
EXIT_STATUS_SUCCESS = 0
EXIT_STATUS_FAILURE = 1
EXIT_STATUS_COMMAND_NOT_FOUND = 127
def patch_sys_exit(testcase):
""" Patch `sys.exit` for the specified test case. """
func_patcher = mock.patch.object(
sys, "exit", autospec=True,
side_effect=FakeSystemExit())
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_sys_argv(testcase):
""" Patch the `sys.argv` sequence for the test case. """
if not hasattr(testcase, 'progname'):
testcase.progname = make_unique_slug(testcase)
if not hasattr(testcase, 'sys_argv'):
testcase.sys_argv = [testcase.progname]
patcher = mock.patch.object(
sys, "argv",
new=list(testcase.sys_argv))
patcher.start()
testcase.addCleanup(patcher.stop)
def patch_system_interfaces(testcase):
""" Patch system interfaces that are disruptive to the test runner. """
patch_stdout(testcase)
patch_stderr(testcase)
patch_sys_exit(testcase)
patch_sys_argv(testcase)
def patch_time_time(testcase, values=None):
""" Patch the `time.time` function for the specified test case.
:param testcase: The `TestCase` instance for binding to the patch.
:param values: An iterable to provide return values.
:return: None.
"""
if values is None:
values = itertools.count()
def generator_fake_time():
while True:
yield next(values)
func_patcher = mock.patch.object(time, "time", autospec=True)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
time.time.side_effect = generator_fake_time()
def patch_os_environ(testcase):
""" Patch the `os.environ` mapping. """
if not hasattr(testcase, 'os_environ'):
testcase.os_environ = {}
patcher = mock.patch.object(os, "environ", new=testcase.os_environ)
patcher.start()
testcase.addCleanup(patcher.stop)
def patch_os_getpid(testcase):
""" Patch `os.getpid` for the specified test case. """
func_patcher = mock.patch.object(os, "getpid", autospec=True)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_getuid(testcase):
""" Patch the `os.getuid` function. """
if not hasattr(testcase, 'os_getuid_return_value'):
testcase.os_getuid_return_value = testcase.getUniqueInteger()
func_patcher = mock.patch.object(
os, "getuid", autospec=True,
return_value=testcase.os_getuid_return_value)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
PasswdEntry = collections.namedtuple(
"PasswdEntry",
"pw_name pw_passwd pw_uid pw_gid pw_gecos pw_dir pw_shell")
def patch_pwd_getpwuid(testcase):
""" Patch the `pwd.getpwuid` function. """
if not hasattr(testcase, 'pwd_getpwuid_return_value'):
testcase.pwd_getpwuid_return_value = PasswdEntry(
pw_name=make_unique_slug(testcase),
pw_passwd=make_unique_slug(testcase),
pw_uid=testcase.getUniqueInteger(),
pw_gid=testcase.getUniqueInteger(),
pw_gecos=testcase.getUniqueString(),
pw_dir=tempfile.mktemp(),
pw_shell=tempfile.mktemp())
if not isinstance(testcase.pwd_getpwuid_return_value, pwd.struct_passwd):
pwent = pwd.struct_passwd(testcase.pwd_getpwuid_return_value)
else:
pwent = testcase.pwd_getpwuid_return_value
func_patcher = mock.patch.object(
pwd, "getpwuid", autospec=True,
return_value=pwent)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_path_exists(testcase):
""" Patch `os.path.exists` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_path_exists = os.path.exists
def fake_os_path_exists(path):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_path_exists_scenario.call_hook()
else:
result = orig_os_path_exists(path)
return result
func_patcher = mock.patch.object(
os.path, "exists", autospec=True,
side_effect=fake_os_path_exists)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_access(testcase):
""" Patch `os.access` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_access = os.access
def fake_os_access(path, mode):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_access_scenario.call_hook(mode)
else:
result = orig_os_access(path, mode)
return result
func_patcher = mock.patch.object(
os, "access", autospec=True,
side_effect=fake_os_access)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
StatResult = collections.namedtuple(
'StatResult', [
'st_mode',
'st_ino', 'st_dev', 'st_nlink',
'st_uid', 'st_gid',
'st_size',
'st_atime', 'st_mtime', 'st_ctime',
])
def patch_os_stat(testcase):
""" Patch `os.stat` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_stat = os.stat
def fake_os_stat(path):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_stat_scenario.call_hook()
else:
result = orig_os_stat(path)
return result
func_patcher = mock.patch.object(
os, "stat", autospec=True,
side_effect=fake_os_stat)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_lstat(testcase):
""" Patch `os.lstat` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_lstat = os.lstat
def fake_os_lstat(path):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_lstat_scenario.call_hook()
else:
result = orig_os_lstat(path)
return result
func_patcher = mock.patch.object(
os, "lstat", autospec=True,
side_effect=fake_os_lstat)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_unlink(testcase):
""" Patch `os.unlink` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_unlink = os.unlink
def fake_os_unlink(path):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_unlink_scenario.call_hook()
else:
result = orig_os_unlink(path)
return result
func_patcher = mock.patch.object(
os, "unlink", autospec=True,
side_effect=fake_os_unlink)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_rmdir(testcase):
""" Patch `os.rmdir` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_os_rmdir = os.rmdir
def fake_os_rmdir(path):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.os_rmdir_scenario.call_hook()
else:
result = orig_os_rmdir(path)
return result
func_patcher = mock.patch.object(
os, "rmdir", autospec=True,
side_effect=fake_os_rmdir)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_shutil_rmtree(testcase):
""" Patch `shutil.rmtree` behaviour for this test case.
When the patched function is called, the registry of
`FileDouble` instances for this test case will be used to get
the instance for the path specified.
"""
orig_shutil_rmtree = os.rmdir
def fake_shutil_rmtree(path, ignore_errors=False, onerror=None):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.shutil_rmtree_scenario.call_hook()
else:
result = orig_shutil_rmtree(path)
return result
func_patcher = mock.patch.object(
shutil, "rmtree", autospec=True,
side_effect=fake_shutil_rmtree)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_tempfile_mkdtemp(testcase):
""" Patch the `tempfile.mkdtemp` function for this test case. """
if not hasattr(testcase, 'tempfile_mkdtemp_file_double'):
testcase.tempfile_mkdtemp_file_double = FileDouble(tempfile.mktemp())
double = testcase.tempfile_mkdtemp_file_double
double.set_os_unlink_scenario('okay')
double.set_os_rmdir_scenario('okay')
double.register_for_testcase(testcase)
func_patcher = mock.patch.object(tempfile, "mkdtemp", autospec=True)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
tempfile.mkdtemp.return_value = testcase.tempfile_mkdtemp_file_double.path
try:
FileNotFoundError
FileExistsError
PermissionError
except NameError:
# Python 2 uses IOError.
def _ensure_ioerror_args(init_args, init_kwargs, errno_value):
result_kwargs = init_kwargs
result_errno = errno_value
result_strerror = os.strerror(errno_value)
result_filename = None
if len(init_args) >= 3:
result_errno = init_args[0]
result_filename = init_args[2]
if 'errno' in init_kwargs:
result_errno = init_kwargs['errno']
del result_kwargs['errno']
if 'filename' in init_kwargs:
result_filename = init_kwargs['filename']
del result_kwargs['filename']
if len(init_args) >= 2:
result_strerror = init_args[1]
if 'strerror' in init_kwargs:
result_strerror = init_kwargs['strerror']
del result_kwargs['strerror']
result_args = (result_errno, result_strerror, result_filename)
return (result_args, result_kwargs)
class FileNotFoundError(IOError):
def __init__(self, *args, **kwargs):
(args, kwargs) = _ensure_ioerror_args(
args, kwargs, errno_value=errno.ENOENT)
super(FileNotFoundError, self).__init__(*args, **kwargs)
class FileExistsError(IOError):
def __init__(self, *args, **kwargs):
(args, kwargs) = _ensure_ioerror_args(
args, kwargs, errno_value=errno.EEXIST)
super(FileExistsError, self).__init__(*args, **kwargs)
class PermissionError(IOError):
def __init__(self, *args, **kwargs):
(args, kwargs) = _ensure_ioerror_args(
args, kwargs, errno_value=errno.EPERM)
super(PermissionError, self).__init__(*args, **kwargs)
def make_fake_file_scenarios(path=None):
""" Make a collection of scenarios for testing with fake files.
:path: The filesystem path of the fake file. If not specified,
a valid random path will be generated.
:return: A collection of scenarios for tests involving input files.
The collection is a mapping from scenario name to a dictionary of
scenario attributes.
"""
if path is None:
file_path = tempfile.mktemp()
else:
file_path = path
fake_file_empty = StringIO()
fake_file_minimal = StringIO("Lorem ipsum.")
fake_file_large = StringIO("\n".join(
"ABCDEFGH" * 100
for __ in range(1000)))
default_scenario_params = {
'open_scenario_name': 'okay',
'file_double_params': dict(
path=file_path, fake_file=fake_file_minimal),
}
scenarios = {
'default': {},
'error-not-exist': {
'open_scenario_name': 'nonexist',
},
'error-exist': {
'open_scenario_name': 'exist_error',
},
'error-read-denied': {
'open_scenario_name': 'read_denied',
},
'not-found': {
'file_double_params': dict(
path=file_path, fake_file=fake_file_empty),
},
'exist-empty': {
'file_double_params': dict(
path=file_path, fake_file=fake_file_empty),
},
'exist-minimal': {
'file_double_params': dict(
path=file_path, fake_file=fake_file_minimal),
},
'exist-large': {
'file_double_params': dict(
path=file_path, fake_file=fake_file_large),
},
}
for (name, scenario) in scenarios.items():
params = default_scenario_params.copy()
params.update(scenario)
scenario.update(params)
scenario['file_double'] = FileDouble(**scenario['file_double_params'])
scenario['file_double'].set_open_scenario(params['open_scenario_name'])
scenario['fake_file_scenario_name'] = name
return scenarios
def get_file_doubles_from_fake_file_scenarios(scenarios):
""" Get the `FileDouble` instances from fake file scenarios.
:param scenarios: Collection of fake file scenarios.
:return: Collection of `FileDouble` instances.
"""
doubles = set(
scenario['file_double']
for scenario in scenarios
if scenario['file_double'] is not None)
return doubles
def setup_file_double_behaviour(testcase, doubles=None):
""" Set up file double instances and behaviour.
:param testcase: The `TestCase` instance to modify.
:param doubles: Collection of `FileDouble` instances.
:return: None.
If `doubles` is ``None``, a default collection will be made
from the result of `make_fake_file_scenarios` result.
"""
if doubles is None:
scenarios = make_fake_file_scenarios()
doubles = get_file_doubles_from_fake_file_scenarios(
scenarios.values())
for file_double in doubles:
file_double.register_for_testcase(testcase)
orig_open = builtins.open
def fake_open(path, mode='rt', buffering=-1):
registry = FileDouble.get_registry_for_testcase(testcase)
if path in registry:
file_double = registry[path]
result = file_double.builtins_open_scenario.call_hook(
mode, buffering)
else:
result = orig_open(path, mode, buffering)
return result
mock_open = mock.mock_open()
mock_open.side_effect = fake_open
func_patcher = mock.patch.object(
builtins, "open", new=mock_open)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def setup_fake_file_fixtures(testcase):
""" Set up fixtures for fake file doubles.
:param testcase: The `TestCase` instance to modify.
:return: None.
"""
scenarios = make_fake_file_scenarios()
testcase.fake_file_scenarios = scenarios
file_doubles = get_file_doubles_from_fake_file_scenarios(
scenarios.values())
setup_file_double_behaviour(testcase, file_doubles)
def set_fake_file_scenario(testcase, name):
""" Set the named fake file scenario for the test case. """
scenario = testcase.fake_file_scenarios[name]
testcase.fake_file_scenario = scenario
testcase.file_double = scenario['file_double']
testcase.file_double.register_for_testcase(testcase)
class TestDoubleFunctionScenario:
""" Scenario for fake behaviour of a specific function. """
def __init__(self, scenario_name, double):
self.scenario_name = scenario_name
self.double = double
self.call_hook = getattr(
self, "_hook_{name}".format(name=self.scenario_name))
def __repr__(self):
text = (
"<{class_name} instance: {id}"
" name: {name!r},"
" call_hook name: {hook_name!r}"
" double: {double!r}"
">").format(
class_name=self.__class__.__name__, id=id(self),
name=self.scenario_name, double=self.double,
hook_name=self.call_hook.__name__)
return text
def __eq__(self, other):
result = True
if not self.scenario_name == other.scenario_name:
result = False
if not self.double == other.double:
result = False
if not self.call_hook.__name__ == other.call_hook.__name__:
result = False
return result
def __ne__(self, other):
result = not self.__eq__(other)
return result
class os_path_exists_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.path.exists` behaviour. """
def _hook_exist(self):
return True
def _hook_not_exist(self):
return False
class os_access_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.access` behaviour. """
def _hook_okay(self, mode):
return True
def _hook_not_exist(self, mode):
return False
def _hook_read_only(self, mode):
if mode & (os.W_OK | os.X_OK):
result = False
else:
result = True
return result
def _hook_denied(self, mode):
if mode & (os.R_OK | os.W_OK | os.X_OK):
result = False
else:
result = True
return result
class os_stat_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.stat` behaviour. """
def _hook_okay(self):
return self.double.stat_result
def _hook_notfound_error(self):
raise FileNotFoundError(
self.double.path,
"No such file or directory: {path!r}".format(
path=self.double.path))
def _hook_denied_error(self):
raise PermissionError(
self.double.path,
"Permission denied")
class os_lstat_scenario(os_stat_scenario):
""" Scenario for `os.lstat` behaviour. """
class os_unlink_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.unlink` behaviour. """
def _hook_okay(self):
return None
def _hook_nonexist(self):
error = FileNotFoundError(
self.double.path,
"No such file or directory: {path!r}".format(
path=self.double.path))
raise error
def _hook_denied(self):
error = PermissionError(
self.double.path,
"Permission denied")
raise error
class os_rmdir_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.rmdir` behaviour. """
def _hook_okay(self):
return None
def _hook_nonexist(self):
error = FileNotFoundError(
self.double.path,
"No such file or directory: {path!r}".format(
path=self.double.path))
raise error
def _hook_denied(self):
error = PermissionError(
self.double.path,
"Permission denied")
raise error
class shutil_rmtree_scenario(TestDoubleFunctionScenario):
""" Scenario for `shutil.rmtree` behaviour. """
def _hook_okay(self):
return None
def _hook_nonexist(self):
error = FileNotFoundError(
self.double.path,
"No such file or directory: {path!r}".format(
path=self.double.path))
raise error
def _hook_denied(self):
error = PermissionError(
self.double.path,
"Permission denied")
raise error
class builtins_open_scenario(TestDoubleFunctionScenario):
""" Scenario for `builtins.open` behaviour. """
def _hook_okay(self, mode, buffering):
result = self.double.fake_file
return result
def _hook_nonexist(self, mode, buffering):
if mode.startswith('r'):
error = FileNotFoundError(
self.double.path,
"No such file or directory: {path!r}".format(
path=self.double.path))
raise error
result = self.double.fake_file
return result
def _hook_exist_error(self, mode, buffering):
if mode.startswith('w') or mode.startswith('a'):
error = FileExistsError(
self.double.path,
"File already exists: {path!r}".format(
path=self.double.path))
raise error
result = self.double.fake_file
return result
def _hook_read_denied(self, mode, buffering):
if mode.startswith('r'):
error = PermissionError(
self.double.path,
"Read denied on {path!r}".format(
path=self.double.path))
raise error
result = self.double.fake_file
return result
def _hook_write_denied(self, mode, buffering):
if mode.startswith('w') or mode.startswith('a'):
error = PermissionError(
self.double.path,
"Write denied on {path!r}".format(
path=self.double.path))
raise error
result = self.double.fake_file
return result
class TestDoubleWithRegistry:
""" Abstract base class for a test double with a test case registry. """
registry_class = NotImplemented
registries = NotImplemented
function_scenario_params_by_class = NotImplemented
def __new__(cls, *args, **kwargs):
superclass = super(TestDoubleWithRegistry, cls)
if superclass.__new__ is object.__new__:
# The ‘object’ implementation complains about extra arguments.
instance = superclass.__new__(cls)
else:
instance = superclass.__new__(cls, *args, **kwargs)
instance.make_set_scenario_methods()
return instance
def __init__(self, *args, **kwargs):
super(TestDoubleWithRegistry, self).__init__(*args, **kwargs)
self._set_method_per_scenario()
def _make_set_scenario_method(self, scenario_class, params):
def method(self, name):
scenario = scenario_class(name, double=self)
setattr(self, scenario_class.__name__, scenario)
method.__doc__ = (
""" Set the scenario for `{name}` behaviour. """
).format(name=scenario_class.__name__)
method.__name__ = str(params['set_scenario_method_name'])
return method
def make_set_scenario_methods(self):
""" Make `set_<scenario_class_name>` methods on this class. """
for (function_scenario_class, function_scenario_params) in (
self.function_scenario_params_by_class.items()):
method = self._make_set_scenario_method(
function_scenario_class, function_scenario_params)
setattr(self.__class__, method.__name__, method)
function_scenario_params['set_scenario_method'] = method
def _set_method_per_scenario(self):
""" Set the method to be called for each scenario. """
for function_scenario_params in (
self.function_scenario_params_by_class.values()):
function_scenario_params['set_scenario_method'](
self, function_scenario_params['default_scenario_name'])
@classmethod
def get_registry_for_testcase(cls, testcase):
""" Get the FileDouble registry for the specified test case. """
# Key in a dict must be hashable.
key = (testcase.__class__, id(testcase))
registry = cls.registries.setdefault(key, cls.registry_class())
return registry
def get_registry_key(self):
""" Get the registry key for this double. """
raise NotImplementedError
def register_for_testcase(self, testcase):
""" Add this instance to registry for the specified testcase. """
registry = self.get_registry_for_testcase(testcase)
key = self.get_registry_key()
registry[key] = self
unregister_func = functools.partial(
self.unregister_for_testcase, testcase)
testcase.addCleanup(unregister_func)
def unregister_for_testcase(self, testcase):
""" Remove this instance from registry for the specified testcase. """
registry = self.get_registry_for_testcase(testcase)
key = self.get_registry_key()
if key in registry:
registry.pop(key)
def copy_fake_file(fake_file):
""" Make a copy of the StringIO instance. """
fake_file_type = StringIO
content = ""
if fake_file is not None:
fake_file_type = type(fake_file)
content = fake_file.getvalue()
assert issubclass(fake_file_type, object)
result = fake_file_type(content)
if hasattr(fake_file, 'encoding'):
if not hasattr(result, 'encoding'):
result.encoding = fake_file.encoding
return result
class FileDouble(TestDoubleWithRegistry):
""" A testing double for a file. """
registry_class = dict
registries = {}
function_scenario_params_by_class = {
os_path_exists_scenario: {
'default_scenario_name': 'not_exist',
'set_scenario_method_name': 'set_os_path_exists_scenario',
},
os_access_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_os_access_scenario',
},
os_stat_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_os_stat_scenario',
},
os_lstat_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_os_lstat_scenario',
},
builtins_open_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_open_scenario',
},
os_unlink_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_os_unlink_scenario',
},
os_rmdir_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_os_rmdir_scenario',
},
shutil_rmtree_scenario: {
'default_scenario_name': 'okay',
'set_scenario_method_name': 'set_shutil_rmtree_scenario',
},
}
def __init__(self, path=None, fake_file=None, *args, **kwargs):
self.path = path
self.fake_file = copy_fake_file(fake_file)
self.fake_file.name = path
self._set_stat_result()
super(FileDouble, self).__init__(*args, **kwargs)
def _set_stat_result(self):
""" Set the `os.stat` result for this file. """
size = len(self.fake_file.getvalue())
self.stat_result = StatResult(
st_mode=0,
st_ino=None, st_dev=None, st_nlink=None,
st_uid=0, st_gid=0,
st_size=size,
st_atime=None, st_mtime=None, st_ctime=None,
)
def __repr__(self):
text = "FileDouble(path={path!r}, fake_file={fake_file!r})".format(
path=self.path, fake_file=self.fake_file)
return text
def get_registry_key(self):
""" Get the registry key for this double. """
result = self.path
return result
class os_popen_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.popen` behaviour. """
stream_name_by_mode = {
'w': 'stdin',
'r': 'stdout',
}
def _hook_success(self, argv, mode, buffering):
stream_name = self.stream_name_by_mode[mode]
stream_double = getattr(
self.double, stream_name + '_double')
result = stream_double.fake_file
return result
def _hook_failure(self, argv, mode, buffering):
result = StringIO()
return result
def _hook_not_found(self, argv, mode, buffering):
result = StringIO()
return result
class os_waitpid_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.waitpid` behaviour. """
def _hook_success(self, pid, options):
result = (pid, EXIT_STATUS_SUCCESS)
return result
def _hook_failure(self, pid, options):
result = (pid, EXIT_STATUS_FAILURE)
return result
def _hook_not_found(self, pid, options):
error = OSError(errno.ECHILD)
raise error
class os_system_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.system` behaviour. """
def _hook_success(self, command):
result = EXIT_STATUS_SUCCESS
return result
def _hook_failure(self, command):
result = EXIT_STATUS_FAILURE
return result
def _hook_not_found(self, command):
result = EXIT_STATUS_COMMAND_NOT_FOUND
return result
class os_spawnv_scenario(TestDoubleFunctionScenario):
""" Scenario for `os.spawnv` behaviour. """
def _hook_success(self, mode, file, args):
result = EXIT_STATUS_SUCCESS
return result
def _hook_failure(self, mode, file, args):
result = EXIT_STATUS_FAILURE
return result
def _hook_not_found(self, mode, file, args):
result = EXIT_STATUS_COMMAND_NOT_FOUND
return result
ARG_ANY = object()
ARG_MORE = object()
class PopenDouble:
""" A testing double for `subprocess.Popen`. """
def __init__(self, args, *posargs, **kwargs):
self.stdin = None
self.stdout = None
self.stderr = None
self.pid = None
self.returncode = None
if kwargs.get('shell', False):
self.argv = shlex.split(args)
else:
# The paramter is already a sequence of command-line arguments.
self.argv = args
def set_streams(self, subprocess_double, popen_kwargs):
""" Set the streams on the `PopenDouble`.
:param subprocess_double: The `SubprocessDouble` from
which to get existing stream doubles.
:param popen_kwargs: The keyword arguments to the
`subprocess.Popen` call.
:return: ``None``.
"""
for stream_name in (
name for name in ['stdin', 'stdout', 'stderr']
if name in popen_kwargs):
stream_spec = popen_kwargs[stream_name]
if stream_spec is subprocess.PIPE:
stream_double = getattr(
subprocess_double,
"{name}_double".format(name=stream_name))
stream_file = stream_double.fake_file
elif stream_spec is subprocess.STDOUT:
stream_file = subprocess_double.stdout_double.fake_file
else:
stream_file = stream_spec
setattr(self, stream_name, stream_file)
def wait(self):
""" Wait for subprocess to terminate. """
return self.returncode
class subprocess_popen_scenario(TestDoubleFunctionScenario):
""" Scenario for `subprocess.Popen` behaviour. """
def _hook_success(self, testcase, args, *posargs, **kwargs):
double = self.double.popen_double
double.set_streams(self.double, kwargs)
return double
def patch_subprocess_popen(testcase):
""" Patch `subprocess.Popen` constructor for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_subprocess_popen = subprocess.Popen
def fake_subprocess_popen(args, *posargs, **kwargs):
if kwargs.get('shell', False):
argv = shlex.split(args)
else:
argv = args
registry = SubprocessDouble.get_registry_for_testcase(testcase)
if argv in registry:
subprocess_double = registry[argv]
result = subprocess_double.subprocess_popen_scenario.call_hook(
testcase, args, *posargs, **kwargs)
else:
result = orig_subprocess_popen(args, *posargs, **kwargs)
return result
func_patcher = mock.patch.object(
subprocess, "Popen", autospec=True,
side_effect=fake_subprocess_popen)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
class subprocess_call_scenario(TestDoubleFunctionScenario):
""" Scenario for `subprocess.call` behaviour. """
def _hook_success(self, command):
result = EXIT_STATUS_SUCCESS
return result
def _hook_failure(self, command):
result = EXIT_STATUS_FAILURE
return result
def _hook_not_found(self, command):
result = EXIT_STATUS_COMMAND_NOT_FOUND
return result
def patch_subprocess_call(testcase):
""" Patch `subprocess.call` function for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_subprocess_call = subprocess.call
def fake_subprocess_call(command, *posargs, **kwargs):
if kwargs.get('shell', False):
command_argv = shlex.split(command)
else:
command_argv = command
registry = SubprocessDouble.get_registry_for_testcase(testcase)
if command_argv in registry:
subprocess_double = registry[command_argv]
result = subprocess_double.subprocess_call_scenario.call_hook(
command)
else:
result = orig_subprocess_call(command, *posargs, **kwargs)
return result
func_patcher = mock.patch.object(
subprocess, "call", autospec=True,
side_effect=fake_subprocess_call)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
class subprocess_check_call_scenario(TestDoubleFunctionScenario):
""" Scenario for `subprocess.check_call` behaviour. """
def _hook_success(self, command):
return None
def _hook_failure(self, command):
result = EXIT_STATUS_FAILURE
error = subprocess.CalledProcessError(result, command)
raise error
def _hook_not_found(self, command):
result = EXIT_STATUS_COMMAND_NOT_FOUND
error = subprocess.CalledProcessError(result, command)
raise error
def patch_subprocess_check_call(testcase):
""" Patch `subprocess.check_call` function for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_subprocess_check_call = subprocess.check_call
def fake_subprocess_check_call(command, *posargs, **kwargs):
if kwargs.get('shell', False):
command_argv = shlex.split(command)
else:
command_argv = command
registry = SubprocessDouble.get_registry_for_testcase(testcase)
if command_argv in registry:
subprocess_double = registry[command_argv]
scenario = subprocess_double.subprocess_check_call_scenario
result = scenario.call_hook(command)
else:
result = orig_subprocess_check_call(command, *posargs, **kwargs)
return result
func_patcher = mock.patch.object(
subprocess, "check_call", autospec=True,
side_effect=fake_subprocess_check_call)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
class SubprocessDoubleRegistry(collections_abc.MutableMapping):
""" Registry of `SubprocessDouble` instances by `argv`. """
def __init__(self, *args, **kwargs):
items = []
if args:
if isinstance(args[0], collections_abc.Mapping):
items = args[0].items()
if isinstance(args[0], collections_abc.Iterable):
items = args[0]
self._mapping = dict(items)
def __repr__(self):
text = "<{class_name} object: {mapping}>".format(
class_name=self.__class__.__name__, mapping=self._mapping)
return text
def _match_argv(self, argv):
""" Match the specified `argv` with our registered keys. """
match = None
if not isinstance(argv, collections_abc.Sequence):
return match
candidates = iter(self._mapping)
while match is None:
try:
candidate = next(candidates)
except StopIteration:
break
found = None
if candidate == argv:
# An exact match.
found = True
word_iter = enumerate(candidate)
while found is None:
try:
(word_index, candidate_word) = next(word_iter)
except StopIteration:
break
if candidate_word is ARG_MORE:
# Candiate matches any remaining words. We have a match.
found = True
elif word_index > len(argv):
# Candidate is too long for the specified argv.
found = False
elif candidate_word is ARG_ANY:
# Candidate matches any word at this position.
continue
elif candidate_word == argv[word_index]:
# Candidate matches the word at this position.
continue
else:
# This candidate does not match.
found = False
if found is None:
# Reached the end of the candidate without a mismatch.
found = True
if found:
match = candidate
return match
def __getitem__(self, key):
match = self._match_argv(key)
if match is None:
raise KeyError(key)
result = self._mapping[match]
return result
def __setitem__(self, key, value):
if key in self:
del self[key]
self._mapping[key] = value
def __delitem__(self, key):
match = self._match_argv(key)
if match is not None:
del self._mapping[match]
def __iter__(self):
return self._mapping.__iter__()
def __len__(self):
return self._mapping.__len__()
class SubprocessDouble(TestDoubleWithRegistry):
""" A testing double for a subprocess. """
registry_class = SubprocessDoubleRegistry
registries = {}
double_by_pid = weakref.WeakValueDictionary()
function_scenario_params_by_class = {
subprocess_popen_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_subprocess_popen_scenario',
},
subprocess_call_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_subprocess_call_scenario',
},
subprocess_check_call_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name':
'set_subprocess_check_call_scenario',
},
os_popen_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_os_popen_scenario',
},
os_waitpid_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_os_waitpid_scenario',
},
os_system_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_os_system_scenario',
},
os_spawnv_scenario: {
'default_scenario_name': 'success',
'set_scenario_method_name': 'set_os_spawnv_scenario',
},
}
def __init__(self, path=None, argv=None, *args, **kwargs):
if path is None:
path = tempfile.mktemp()
self.path = path
if argv is None:
command_name = os.path.basename(path)
argv = [command_name]
self.argv = argv
self.pid = self._make_pid()
self._register_by_pid()
self.set_popen_double()
stream_class = SubprocessDouble.stream_class
for stream_name in ['stdin', 'stdout', 'stderr']:
fake_file = stream_class()
file_double = FileDouble(fake_file=fake_file)
stream_double_name = '{name}_double'.format(name=stream_name)
setattr(self, stream_double_name, file_double)
super(SubprocessDouble, self).__init__(*args, **kwargs)
def set_popen_double(self):
""" Set the `PopenDouble` for this instance. """
double = PopenDouble(self.argv)
double.pid = self.pid
self.popen_double = double
def __repr__(self):
text = (
"<SubprocessDouble instance: {id}"
" path: {path!r},"
" argv: {argv!r}"
" stdin_double: {stdin_double!r}"
" stdout_double: {stdout_double!r}"
" stderr_double: {stderr_double!r}"
">").format(
id=id(self),
path=self.path, argv=self.argv,
stdin_double=self.stdin_double,
stdout_double=self.stdout_double,
stderr_double=self.stderr_double)
return text
@classmethod
def _make_pid(cls):
""" Make a unique PID for a subprocess. """
for pid in itertools.count(1):
yield pid
def _register_by_pid(self):
""" Register this subprocess by its PID. """
self.__class__.double_by_pid[self.pid] = self
def get_registry_key(self):
""" Get the registry key for this double. """
result = tuple(self.argv)
return result
stream_class = io.BytesIO
stream_encoding = "utf-8"
def set_stdin_content(self, text, bytes_encoding=stream_encoding):
""" Set the content of the `stdin` stream for this double. """
content = text.encode(bytes_encoding)
fake_file = self.stream_class(content)
self.stdin_double.fake_file = fake_file
def set_stdout_content(self, text, bytes_encoding=stream_encoding):
""" Set the content of the `stdout` stream for this double. """
content = text.encode(bytes_encoding)
fake_file = self.stream_class(content)
self.stdout_double.fake_file = fake_file
def set_stderr_content(self, text, bytes_encoding=stream_encoding):
""" Set the content of the `stderr` stream for this double. """
content = text.encode(bytes_encoding)
fake_file = self.stream_class(content)
self.stderr_double.fake_file = fake_file
def make_fake_subprocess_scenarios(path=None):
""" Make a collection of scenarios for testing with fake files.
:path: The filesystem path of the fake program. If not specified,
a valid random path will be generated.
:return: A collection of scenarios for tests involving subprocesses.
The collection is a mapping from scenario name to a dictionary of
scenario attributes.
"""
if path is None:
file_path = tempfile.mktemp()
else:
file_path = path
default_scenario_params = {
'return_value': EXIT_STATUS_SUCCESS,
'program_path': file_path,
'argv_after_command_name': [],
}
scenarios = {
'default': {},
'not-found': {
'return_value': EXIT_STATUS_COMMAND_NOT_FOUND,
},
}
for (name, scenario) in scenarios.items():
params = default_scenario_params.copy()
params.update(scenario)
scenario.update(params)
program_path = params['program_path']
program_name = os.path.basename(params['program_path'])
argv = [program_name]
argv.extend(params['argv_after_command_name'])
subprocess_double_params = dict(
path=program_path,
argv=argv,
)
subprocess_double = SubprocessDouble(**subprocess_double_params)
scenario['subprocess_double'] = subprocess_double
scenario['fake_file_scenario_name'] = name
return scenarios
def get_subprocess_doubles_from_fake_subprocess_scenarios(scenarios):
""" Get the `SubprocessDouble` instances from fake subprocess scenarios.
:param scenarios: Collection of fake subprocess scenarios.
:return: Collection of `SubprocessDouble` instances.
"""
doubles = set(
scenario['subprocess_double']
for scenario in scenarios
if scenario['subprocess_double'] is not None)
return doubles
def setup_subprocess_double_behaviour(testcase, doubles=None):
""" Set up subprocess double instances and behaviour.
:param testcase: The `TestCase` instance to modify.
:param doubles: Collection of `SubprocessDouble` instances.
:return: None.
If `doubles` is ``None``, a default collection will be made
from the return value of `make_fake_subprocess_scenarios`.
"""
if doubles is None:
scenarios = make_fake_subprocess_scenarios()
doubles = get_subprocess_doubles_from_fake_subprocess_scenarios(
scenarios.values())
for double in doubles:
double.register_for_testcase(testcase)
def setup_fake_subprocess_fixtures(testcase):
""" Set up fixtures for fake subprocess doubles.
:param testcase: The `TestCase` instance to modify.
:return: None.
"""
scenarios = make_fake_subprocess_scenarios()
testcase.fake_subprocess_scenarios = scenarios
doubles = get_subprocess_doubles_from_fake_subprocess_scenarios(
scenarios.values())
setup_subprocess_double_behaviour(testcase, doubles)
def patch_os_popen(testcase):
""" Patch `os.popen` behaviour for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_os_popen = os.popen
def fake_os_popen(cmd, mode='r', buffering=-1):
registry = SubprocessDouble.get_registry_for_testcase(testcase)
if isinstance(cmd, basestring):
command_argv = shlex.split(cmd)
else:
command_argv = cmd
if command_argv in registry:
subprocess_double = registry[command_argv]
result = subprocess_double.os_popen_scenario.call_hook(
command_argv, mode, buffering)
else:
result = orig_os_popen(cmd, mode, buffering)
return result
func_patcher = mock.patch.object(
os, "popen", autospec=True,
side_effect=fake_os_popen)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_waitpid(testcase):
""" Patch `os.waitpid` behaviour for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_os_waitpid = os.waitpid
def fake_os_waitpid(pid, options):
registry = SubprocessDouble.double_by_pid
if pid in registry:
subprocess_double = registry[pid]
result = subprocess_double.os_waitpid_scenario.call_hook(
pid, options)
else:
result = orig_os_waitpid(pid, options)
return result
func_patcher = mock.patch.object(
os, "waitpid", autospec=True,
side_effect=fake_os_waitpid)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_system(testcase):
""" Patch `os.system` behaviour for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_os_system = os.system
def fake_os_system(command):
registry = SubprocessDouble.get_registry_for_testcase(testcase)
command_argv = shlex.split(command)
if command_argv in registry:
subprocess_double = registry[command_argv]
result = subprocess_double.os_system_scenario.call_hook(
command)
else:
result = orig_os_system(command)
return result
func_patcher = mock.patch.object(
os, "system", autospec=True,
side_effect=fake_os_system)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
def patch_os_spawnv(testcase):
""" Patch `os.spawnv` behaviour for this test case.
:param testcase: The `TestCase` instance to modify.
:return: None.
When the patched function is called, the registry of
`SubprocessDouble` instances for this test case will be used
to get the instance for the program path specified.
"""
orig_os_spawnv = os.spawnv
def fake_os_spawnv(mode, file, args):
registry = SubprocessDouble.get_registry_for_testcase(testcase)
registry_key = tuple(args)
if registry_key in registry:
subprocess_double = registry[registry_key]
result = subprocess_double.os_spawnv_scenario.call_hook(
mode, file, args)
else:
result = orig_os_spawnv(mode, file, args)
return result
func_patcher = mock.patch.object(
os, "spawnv", autospec=True,
side_effect=fake_os_spawnv)
func_patcher.start()
testcase.addCleanup(func_patcher.stop)
# Copyright © 2015–2016 Ben Finney <bignose@debian.org>
#
# This is free software: you may copy, modify, and/or distribute this work
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 3 of that license or any later version.
# No warranty expressed or implied. See the file ‘LICENSE.GPL-3’ for details.
# Local variables:
# coding: utf-8
# mode: python
# End:
# vim: fileencoding=utf-8 filetype=python :
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