Index: tools/telemetry/third_party/mox3/mox3/mox.py |
diff --git a/tools/telemetry/third_party/mox3/mox3/mox.py b/tools/telemetry/third_party/mox3/mox3/mox.py |
deleted file mode 100644 |
index 3c10cc8b92ffa31e34cbc93f9adbd884998cafee..0000000000000000000000000000000000000000 |
--- a/tools/telemetry/third_party/mox3/mox3/mox.py |
+++ /dev/null |
@@ -1,2168 +0,0 @@ |
-# Copyright 2008 Google Inc. |
-# |
-# Licensed under the Apache License, Version 2.0 (the "License"); |
-# you may not use this file except in compliance with the License. |
-# You may obtain a copy of the License at |
-# |
-# http://www.apache.org/licenses/LICENSE-2.0 |
-# |
-# Unless required by applicable law or agreed to in writing, software |
-# distributed under the License is distributed on an "AS IS" BASIS, |
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
-# See the License for the specific language governing permissions and |
-# limitations under the License. |
-# |
-# This is a fork of the pymox library intended to work with Python 3. |
-# The file was modified by quermit@gmail.com and dawid.fatyga@gmail.com |
- |
-"""Mox, an object-mocking framework for Python. |
- |
-Mox works in the record-replay-verify paradigm. When you first create |
-a mock object, it is in record mode. You then programmatically set |
-the expected behavior of the mock object (what methods are to be |
-called on it, with what parameters, what they should return, and in |
-what order). |
- |
-Once you have set up the expected mock behavior, you put it in replay |
-mode. Now the mock responds to method calls just as you told it to. |
-If an unexpected method (or an expected method with unexpected |
-parameters) is called, then an exception will be raised. |
- |
-Once you are done interacting with the mock, you need to verify that |
-all the expected interactions occured. (Maybe your code exited |
-prematurely without calling some cleanup method!) The verify phase |
-ensures that every expected method was called; otherwise, an exception |
-will be raised. |
- |
-WARNING! Mock objects created by Mox are not thread-safe. If you are |
-call a mock in multiple threads, it should be guarded by a mutex. |
- |
-TODO(stevepm): Add the option to make mocks thread-safe! |
- |
-Suggested usage / workflow: |
- |
- # Create Mox factory |
- my_mox = Mox() |
- |
- # Create a mock data access object |
- mock_dao = my_mox.CreateMock(DAOClass) |
- |
- # Set up expected behavior |
- mock_dao.RetrievePersonWithIdentifier('1').AndReturn(person) |
- mock_dao.DeletePerson(person) |
- |
- # Put mocks in replay mode |
- my_mox.ReplayAll() |
- |
- # Inject mock object and run test |
- controller.SetDao(mock_dao) |
- controller.DeletePersonById('1') |
- |
- # Verify all methods were called as expected |
- my_mox.VerifyAll() |
-""" |
- |
-import collections |
-import difflib |
-import inspect |
-import re |
-import types |
-import unittest |
- |
-from mox3 import stubout |
- |
- |
-class Error(AssertionError): |
- """Base exception for this module.""" |
- |
- pass |
- |
- |
-class ExpectedMethodCallsError(Error): |
- """Raised when an expected method wasn't called. |
- |
- This can occur if Verify() is called before all expected methods have been |
- called. |
- """ |
- |
- def __init__(self, expected_methods): |
- """Init exception. |
- |
- Args: |
- # expected_methods: A sequence of MockMethod objects that should |
- # have been called. |
- expected_methods: [MockMethod] |
- |
- Raises: |
- ValueError: if expected_methods contains no methods. |
- """ |
- |
- if not expected_methods: |
- raise ValueError("There must be at least one expected method") |
- Error.__init__(self) |
- self._expected_methods = expected_methods |
- |
- def __str__(self): |
- calls = "\n".join(["%3d. %s" % (i, m) |
- for i, m in enumerate(self._expected_methods)]) |
- return "Verify: Expected methods never called:\n%s" % (calls,) |
- |
- |
-class UnexpectedMethodCallError(Error): |
- """Raised when an unexpected method is called. |
- |
- This can occur if a method is called with incorrect parameters, or out of |
- the specified order. |
- """ |
- |
- def __init__(self, unexpected_method, expected): |
- """Init exception. |
- |
- Args: |
- # unexpected_method: MockMethod that was called but was not at the |
- # head of the expected_method queue. |
- # expected: MockMethod or UnorderedGroup the method should have |
- # been in. |
- unexpected_method: MockMethod |
- expected: MockMethod or UnorderedGroup |
- """ |
- |
- Error.__init__(self) |
- if expected is None: |
- self._str = "Unexpected method call %s" % (unexpected_method,) |
- else: |
- differ = difflib.Differ() |
- diff = differ.compare(str(unexpected_method).splitlines(True), |
- str(expected).splitlines(True)) |
- self._str = ("Unexpected method call." |
- " unexpected:- expected:+\n%s" |
- % ("\n".join(line.rstrip() for line in diff),)) |
- |
- def __str__(self): |
- return self._str |
- |
- |
-class UnknownMethodCallError(Error): |
- """Raised if an unknown method is requested of the mock object.""" |
- |
- def __init__(self, unknown_method_name): |
- """Init exception. |
- |
- Args: |
- # unknown_method_name: Method call that is not part of the mocked |
- # class's public interface. |
- unknown_method_name: str |
- """ |
- |
- Error.__init__(self) |
- self._unknown_method_name = unknown_method_name |
- |
- def __str__(self): |
- return ("Method called is not a member of the object: %s" % |
- self._unknown_method_name) |
- |
- |
-class PrivateAttributeError(Error): |
- """Raised if a MockObject is passed a private additional attribute name.""" |
- |
- def __init__(self, attr): |
- Error.__init__(self) |
- self._attr = attr |
- |
- def __str__(self): |
- return ("Attribute '%s' is private and should not be available" |
- "in a mock object." % self._attr) |
- |
- |
-class ExpectedMockCreationError(Error): |
- """Raised if mocks should have been created by StubOutClassWithMocks.""" |
- |
- def __init__(self, expected_mocks): |
- """Init exception. |
- |
- Args: |
- # expected_mocks: A sequence of MockObjects that should have been |
- # created |
- |
- Raises: |
- ValueError: if expected_mocks contains no methods. |
- """ |
- |
- if not expected_mocks: |
- raise ValueError("There must be at least one expected method") |
- Error.__init__(self) |
- self._expected_mocks = expected_mocks |
- |
- def __str__(self): |
- mocks = "\n".join(["%3d. %s" % (i, m) |
- for i, m in enumerate(self._expected_mocks)]) |
- return "Verify: Expected mocks never created:\n%s" % (mocks,) |
- |
- |
-class UnexpectedMockCreationError(Error): |
- """Raised if too many mocks were created by StubOutClassWithMocks.""" |
- |
- def __init__(self, instance, *params, **named_params): |
- """Init exception. |
- |
- Args: |
- # instance: the type of obejct that was created |
- # params: parameters given during instantiation |
- # named_params: named parameters given during instantiation |
- """ |
- |
- Error.__init__(self) |
- self._instance = instance |
- self._params = params |
- self._named_params = named_params |
- |
- def __str__(self): |
- args = ", ".join(["%s" % v for i, v in enumerate(self._params)]) |
- error = "Unexpected mock creation: %s(%s" % (self._instance, args) |
- |
- if self._named_params: |
- error += ", " + ", ".join(["%s=%s" % (k, v) for k, v in |
- self._named_params.items()]) |
- |
- error += ")" |
- return error |
- |
- |
-class Mox(object): |
- """Mox: a factory for creating mock objects.""" |
- |
- # A list of types that should be stubbed out with MockObjects (as |
- # opposed to MockAnythings). |
- _USE_MOCK_OBJECT = [types.FunctionType, types.ModuleType, types.MethodType] |
- |
- def __init__(self): |
- """Initialize a new Mox.""" |
- |
- self._mock_objects = [] |
- self.stubs = stubout.StubOutForTesting() |
- |
- def CreateMock(self, class_to_mock, attrs=None, bounded_to=None): |
- """Create a new mock object. |
- |
- Args: |
- # class_to_mock: the class to be mocked |
- class_to_mock: class |
- attrs: dict of attribute names to values that will be |
- set on the mock object. Only public attributes may be set. |
- bounded_to: optionally, when class_to_mock is not a class, |
- it points to a real class object, to which |
- attribute is bound |
- |
- Returns: |
- MockObject that can be used as the class_to_mock would be. |
- """ |
- if attrs is None: |
- attrs = {} |
- new_mock = MockObject(class_to_mock, attrs=attrs, |
- class_to_bind=bounded_to) |
- self._mock_objects.append(new_mock) |
- return new_mock |
- |
- def CreateMockAnything(self, description=None): |
- """Create a mock that will accept any method calls. |
- |
- This does not enforce an interface. |
- |
- Args: |
- description: str. Optionally, a descriptive name for the mock object |
- being created, for debugging output purposes. |
- """ |
- new_mock = MockAnything(description=description) |
- self._mock_objects.append(new_mock) |
- return new_mock |
- |
- def ReplayAll(self): |
- """Set all mock objects to replay mode.""" |
- |
- for mock_obj in self._mock_objects: |
- mock_obj._Replay() |
- |
- def VerifyAll(self): |
- """Call verify on all mock objects created.""" |
- |
- for mock_obj in self._mock_objects: |
- mock_obj._Verify() |
- |
- def ResetAll(self): |
- """Call reset on all mock objects. This does not unset stubs.""" |
- |
- for mock_obj in self._mock_objects: |
- mock_obj._Reset() |
- |
- def StubOutWithMock(self, obj, attr_name, use_mock_anything=False): |
- """Replace a method, attribute, etc. with a Mock. |
- |
- This will replace a class or module with a MockObject, and everything |
- else (method, function, etc) with a MockAnything. This can be |
- overridden to always use a MockAnything by setting use_mock_anything |
- to True. |
- |
- Args: |
- obj: A Python object (class, module, instance, callable). |
- attr_name: str. The name of the attribute to replace with a mock. |
- use_mock_anything: bool. True if a MockAnything should be used |
- regardless of the type of attribute. |
- """ |
- |
- if inspect.isclass(obj): |
- class_to_bind = obj |
- else: |
- class_to_bind = None |
- |
- attr_to_replace = getattr(obj, attr_name) |
- attr_type = type(attr_to_replace) |
- |
- if attr_type == MockAnything or attr_type == MockObject: |
- raise TypeError('Cannot mock a MockAnything! Did you remember to ' |
- 'call UnsetStubs in your previous test?') |
- |
- type_check = ( |
- attr_type in self._USE_MOCK_OBJECT or |
- inspect.isclass(attr_to_replace) or |
- isinstance(attr_to_replace, object)) |
- if type_check and not use_mock_anything: |
- stub = self.CreateMock(attr_to_replace, bounded_to=class_to_bind) |
- else: |
- stub = self.CreateMockAnything( |
- description='Stub for %s' % attr_to_replace) |
- stub.__name__ = attr_name |
- |
- self.stubs.Set(obj, attr_name, stub) |
- |
- def StubOutClassWithMocks(self, obj, attr_name): |
- """Replace a class with a "mock factory" that will create mock objects. |
- |
- This is useful if the code-under-test directly instantiates |
- dependencies. Previously some boilder plate was necessary to |
- create a mock that would act as a factory. Using |
- StubOutClassWithMocks, once you've stubbed out the class you may |
- use the stubbed class as you would any other mock created by mox: |
- during the record phase, new mock instances will be created, and |
- during replay, the recorded mocks will be returned. |
- |
- In replay mode |
- |
- # Example using StubOutWithMock (the old, clunky way): |
- |
- mock1 = mox.CreateMock(my_import.FooClass) |
- mock2 = mox.CreateMock(my_import.FooClass) |
- foo_factory = mox.StubOutWithMock(my_import, 'FooClass', |
- use_mock_anything=True) |
- foo_factory(1, 2).AndReturn(mock1) |
- foo_factory(9, 10).AndReturn(mock2) |
- mox.ReplayAll() |
- |
- my_import.FooClass(1, 2) # Returns mock1 again. |
- my_import.FooClass(9, 10) # Returns mock2 again. |
- mox.VerifyAll() |
- |
- # Example using StubOutClassWithMocks: |
- |
- mox.StubOutClassWithMocks(my_import, 'FooClass') |
- mock1 = my_import.FooClass(1, 2) # Returns a new mock of FooClass |
- mock2 = my_import.FooClass(9, 10) # Returns another mock instance |
- mox.ReplayAll() |
- |
- my_import.FooClass(1, 2) # Returns mock1 again. |
- my_import.FooClass(9, 10) # Returns mock2 again. |
- mox.VerifyAll() |
- """ |
- attr_to_replace = getattr(obj, attr_name) |
- attr_type = type(attr_to_replace) |
- |
- if attr_type == MockAnything or attr_type == MockObject: |
- raise TypeError('Cannot mock a MockAnything! Did you remember to ' |
- 'call UnsetStubs in your previous test?') |
- |
- if not inspect.isclass(attr_to_replace): |
- raise TypeError('Given attr is not a Class. Use StubOutWithMock.') |
- |
- factory = _MockObjectFactory(attr_to_replace, self) |
- self._mock_objects.append(factory) |
- self.stubs.Set(obj, attr_name, factory) |
- |
- def UnsetStubs(self): |
- """Restore stubs to their original state.""" |
- |
- self.stubs.UnsetAll() |
- |
- |
-def Replay(*args): |
- """Put mocks into Replay mode. |
- |
- Args: |
- # args is any number of mocks to put into replay mode. |
- """ |
- |
- for mock in args: |
- mock._Replay() |
- |
- |
-def Verify(*args): |
- """Verify mocks. |
- |
- Args: |
- # args is any number of mocks to be verified. |
- """ |
- |
- for mock in args: |
- mock._Verify() |
- |
- |
-def Reset(*args): |
- """Reset mocks. |
- |
- Args: |
- # args is any number of mocks to be reset. |
- """ |
- |
- for mock in args: |
- mock._Reset() |
- |
- |
-class MockAnything(object): |
- """A mock that can be used to mock anything. |
- |
- This is helpful for mocking classes that do not provide a public interface. |
- """ |
- |
- def __init__(self, description=None): |
- """Initialize a new MockAnything. |
- |
- Args: |
- description: str. Optionally, a descriptive name for the mock |
- object being created, for debugging output purposes. |
- """ |
- self._description = description |
- self._Reset() |
- |
- def __repr__(self): |
- if self._description: |
- return '<MockAnything instance of %s>' % self._description |
- else: |
- return '<MockAnything instance>' |
- |
- def __getattr__(self, method_name): |
- """Intercept method calls on this object. |
- |
- A new MockMethod is returned that is aware of the MockAnything's |
- state (record or replay). The call will be recorded or replayed |
- by the MockMethod's __call__. |
- |
- Args: |
- # method name: the name of the method being called. |
- method_name: str |
- |
- Returns: |
- A new MockMethod aware of MockAnything's state (record or replay). |
- """ |
- if method_name == '__dir__': |
- return self.__class__.__dir__.__get__(self, self.__class__) |
- |
- return self._CreateMockMethod(method_name) |
- |
- def __str__(self): |
- return self._CreateMockMethod('__str__')() |
- |
- def __call__(self, *args, **kwargs): |
- return self._CreateMockMethod('__call__')(*args, **kwargs) |
- |
- def __getitem__(self, i): |
- return self._CreateMockMethod('__getitem__')(i) |
- |
- def _CreateMockMethod(self, method_name, method_to_mock=None, |
- class_to_bind=object): |
- """Create a new mock method call and return it. |
- |
- Args: |
- # method_name: the name of the method being called. |
- # method_to_mock: The actual method being mocked, used for |
- # introspection. |
- # class_to_bind: Class to which method is bounded |
- # (object by default) |
- method_name: str |
- method_to_mock: a method object |
- |
- Returns: |
- A new MockMethod aware of MockAnything's state (record or replay). |
- """ |
- |
- return MockMethod(method_name, self._expected_calls_queue, |
- self._replay_mode, method_to_mock=method_to_mock, |
- description=self._description, |
- class_to_bind=class_to_bind) |
- |
- def __nonzero__(self): |
- """Return 1 for nonzero so the mock can be used as a conditional.""" |
- |
- return 1 |
- |
- def __bool__(self): |
- """Return True for nonzero so the mock can be used as a conditional.""" |
- return True |
- |
- def __eq__(self, rhs): |
- """Provide custom logic to compare objects.""" |
- |
- return (isinstance(rhs, MockAnything) and |
- self._replay_mode == rhs._replay_mode and |
- self._expected_calls_queue == rhs._expected_calls_queue) |
- |
- def __ne__(self, rhs): |
- """Provide custom logic to compare objects.""" |
- |
- return not self == rhs |
- |
- def _Replay(self): |
- """Start replaying expected method calls.""" |
- |
- self._replay_mode = True |
- |
- def _Verify(self): |
- """Verify that all of the expected calls have been made. |
- |
- Raises: |
- ExpectedMethodCallsError: if there are still more method calls in |
- the expected queue. |
- """ |
- |
- # If the list of expected calls is not empty, raise an exception |
- if self._expected_calls_queue: |
- # The last MultipleTimesGroup is not popped from the queue. |
- if (len(self._expected_calls_queue) == 1 and |
- isinstance(self._expected_calls_queue[0], |
- MultipleTimesGroup) and |
- self._expected_calls_queue[0].IsSatisfied()): |
- pass |
- else: |
- raise ExpectedMethodCallsError(self._expected_calls_queue) |
- |
- def _Reset(self): |
- """Reset the state of this mock to record mode with an empty queue.""" |
- |
- # Maintain a list of method calls we are expecting |
- self._expected_calls_queue = collections.deque() |
- |
- # Make sure we are in setup mode, not replay mode |
- self._replay_mode = False |
- |
- |
-class MockObject(MockAnything): |
- """Mock object that simulates the public/protected interface of a class.""" |
- |
- def __init__(self, class_to_mock, attrs=None, class_to_bind=None): |
- """Initialize a mock object. |
- |
- Determines the methods and properties of the class and stores them. |
- |
- Args: |
- # class_to_mock: class to be mocked |
- class_to_mock: class |
- attrs: dict of attribute names to values that will be set on the |
- mock object. Only public attributes may be set. |
- class_to_bind: optionally, when class_to_mock is not a class at |
- all, it points to a real class |
- |
- Raises: |
- PrivateAttributeError: if a supplied attribute is not public. |
- ValueError: if an attribute would mask an existing method. |
- """ |
- if attrs is None: |
- attrs = {} |
- |
- # Used to hack around the mixin/inheritance of MockAnything, which |
- # is not a proper object (it can be anything. :-) |
- MockAnything.__dict__['__init__'](self) |
- |
- # Get a list of all the public and special methods we should mock. |
- self._known_methods = set() |
- self._known_vars = set() |
- self._class_to_mock = class_to_mock |
- |
- if inspect.isclass(class_to_mock): |
- self._class_to_bind = self._class_to_mock |
- else: |
- self._class_to_bind = class_to_bind |
- |
- try: |
- if inspect.isclass(self._class_to_mock): |
- self._description = class_to_mock.__name__ |
- else: |
- self._description = type(class_to_mock).__name__ |
- except Exception: |
- pass |
- |
- for method in dir(class_to_mock): |
- attr = getattr(class_to_mock, method) |
- if callable(attr): |
- self._known_methods.add(method) |
- elif not (type(attr) is property): |
- # treating properties as class vars makes little sense. |
- self._known_vars.add(method) |
- |
- # Set additional attributes at instantiation time; this is quicker |
- # than manually setting attributes that are normally created in |
- # __init__. |
- for attr, value in attrs.items(): |
- if attr.startswith("_"): |
- raise PrivateAttributeError(attr) |
- elif attr in self._known_methods: |
- raise ValueError("'%s' is a method of '%s' objects." % (attr, |
- class_to_mock)) |
- else: |
- setattr(self, attr, value) |
- |
- def _CreateMockMethod(self, *args, **kwargs): |
- """Overridden to provide self._class_to_mock to class_to_bind.""" |
- kwargs.setdefault("class_to_bind", self._class_to_bind) |
- return super(MockObject, self)._CreateMockMethod(*args, **kwargs) |
- |
- def __getattr__(self, name): |
- """Intercept attribute request on this object. |
- |
- If the attribute is a public class variable, it will be returned and |
- not recorded as a call. |
- |
- If the attribute is not a variable, it is handled like a method |
- call. The method name is checked against the set of mockable |
- methods, and a new MockMethod is returned that is aware of the |
- MockObject's state (record or replay). The call will be recorded |
- or replayed by the MockMethod's __call__. |
- |
- Args: |
- # name: the name of the attribute being requested. |
- name: str |
- |
- Returns: |
- Either a class variable or a new MockMethod that is aware of the |
- state of the mock (record or replay). |
- |
- Raises: |
- UnknownMethodCallError if the MockObject does not mock the |
- requested method. |
- """ |
- |
- if name in self._known_vars: |
- return getattr(self._class_to_mock, name) |
- |
- if name in self._known_methods: |
- return self._CreateMockMethod( |
- name, |
- method_to_mock=getattr(self._class_to_mock, name)) |
- |
- raise UnknownMethodCallError(name) |
- |
- def __eq__(self, rhs): |
- """Provide custom logic to compare objects.""" |
- |
- return (isinstance(rhs, MockObject) and |
- self._class_to_mock == rhs._class_to_mock and |
- self._replay_mode == rhs._replay_mode and |
- self._expected_calls_queue == rhs._expected_calls_queue) |
- |
- def __setitem__(self, key, value): |
- """Custom logic for mocking classes that support item assignment. |
- |
- Args: |
- key: Key to set the value for. |
- value: Value to set. |
- |
- Returns: |
- Expected return value in replay mode. A MockMethod object for the |
- __setitem__ method that has already been called if not in replay |
- mode. |
- |
- Raises: |
- TypeError if the underlying class does not support item assignment. |
- UnexpectedMethodCallError if the object does not expect the call to |
- __setitem__. |
- |
- """ |
- # Verify the class supports item assignment. |
- if '__setitem__' not in dir(self._class_to_mock): |
- raise TypeError('object does not support item assignment') |
- |
- # If we are in replay mode then simply call the mock __setitem__ method |
- if self._replay_mode: |
- return MockMethod('__setitem__', self._expected_calls_queue, |
- self._replay_mode)(key, value) |
- |
- # Otherwise, create a mock method __setitem__. |
- return self._CreateMockMethod('__setitem__')(key, value) |
- |
- def __getitem__(self, key): |
- """Provide custom logic for mocking classes that are subscriptable. |
- |
- Args: |
- key: Key to return the value for. |
- |
- Returns: |
- Expected return value in replay mode. A MockMethod object for the |
- __getitem__ method that has already been called if not in replay |
- mode. |
- |
- Raises: |
- TypeError if the underlying class is not subscriptable. |
- UnexpectedMethodCallError if the object does not expect the call to |
- __getitem__. |
- |
- """ |
- # Verify the class supports item assignment. |
- if '__getitem__' not in dir(self._class_to_mock): |
- raise TypeError('unsubscriptable object') |
- |
- # If we are in replay mode then simply call the mock __getitem__ method |
- if self._replay_mode: |
- return MockMethod('__getitem__', self._expected_calls_queue, |
- self._replay_mode)(key) |
- |
- # Otherwise, create a mock method __getitem__. |
- return self._CreateMockMethod('__getitem__')(key) |
- |
- def __iter__(self): |
- """Provide custom logic for mocking classes that are iterable. |
- |
- Returns: |
- Expected return value in replay mode. A MockMethod object for the |
- __iter__ method that has already been called if not in replay mode. |
- |
- Raises: |
- TypeError if the underlying class is not iterable. |
- UnexpectedMethodCallError if the object does not expect the call to |
- __iter__. |
- |
- """ |
- methods = dir(self._class_to_mock) |
- |
- # Verify the class supports iteration. |
- if '__iter__' not in methods: |
- # If it doesn't have iter method and we are in replay method, |
- # then try to iterate using subscripts. |
- if '__getitem__' not in methods or not self._replay_mode: |
- raise TypeError('not iterable object') |
- else: |
- results = [] |
- index = 0 |
- try: |
- while True: |
- results.append(self[index]) |
- index += 1 |
- except IndexError: |
- return iter(results) |
- |
- # If we are in replay mode then simply call the mock __iter__ method. |
- if self._replay_mode: |
- return MockMethod('__iter__', self._expected_calls_queue, |
- self._replay_mode)() |
- |
- # Otherwise, create a mock method __iter__. |
- return self._CreateMockMethod('__iter__')() |
- |
- def __contains__(self, key): |
- """Provide custom logic for mocking classes that contain items. |
- |
- Args: |
- key: Key to look in container for. |
- |
- Returns: |
- Expected return value in replay mode. A MockMethod object for the |
- __contains__ method that has already been called if not in replay |
- mode. |
- |
- Raises: |
- TypeError if the underlying class does not implement __contains__ |
- UnexpectedMethodCaller if the object does not expect the call to |
- __contains__. |
- |
- """ |
- contains = self._class_to_mock.__dict__.get('__contains__', None) |
- |
- if contains is None: |
- raise TypeError('unsubscriptable object') |
- |
- if self._replay_mode: |
- return MockMethod('__contains__', self._expected_calls_queue, |
- self._replay_mode)(key) |
- |
- return self._CreateMockMethod('__contains__')(key) |
- |
- def __call__(self, *params, **named_params): |
- """Provide custom logic for mocking classes that are callable.""" |
- |
- # Verify the class we are mocking is callable. |
- is_callable = hasattr(self._class_to_mock, '__call__') |
- if not is_callable: |
- raise TypeError('Not callable') |
- |
- # Because the call is happening directly on this object instead of |
- # a method, the call on the mock method is made right here |
- |
- # If we are mocking a Function, then use the function, and not the |
- # __call__ method |
- method = None |
- if type(self._class_to_mock) in (types.FunctionType, types.MethodType): |
- method = self._class_to_mock |
- else: |
- method = getattr(self._class_to_mock, '__call__') |
- mock_method = self._CreateMockMethod('__call__', method_to_mock=method) |
- |
- return mock_method(*params, **named_params) |
- |
- @property |
- def __name__(self): |
- """Return the name that is being mocked.""" |
- return self._description |
- |
- # TODO(dejw): this property stopped to work after I introduced changes with |
- # binding classes. Fortunately I found a solution in the form of |
- # __getattribute__ method below, but this issue should be investigated |
- @property |
- def __class__(self): |
- return self._class_to_mock |
- |
- def __dir__(self): |
- """Return only attributes of a class to mock.""" |
- return dir(self._class_to_mock) |
- |
- def __getattribute__(self, name): |
- """Return _class_to_mock on __class__ attribute.""" |
- if name == "__class__": |
- return super(MockObject, self).__getattribute__("_class_to_mock") |
- |
- return super(MockObject, self).__getattribute__(name) |
- |
- |
-class _MockObjectFactory(MockObject): |
- """A MockObjectFactory creates mocks and verifies __init__ params. |
- |
- A MockObjectFactory removes the boiler plate code that was previously |
- necessary to stub out direction instantiation of a class. |
- |
- The MockObjectFactory creates new MockObjects when called and verifies the |
- __init__ params are correct when in record mode. When replaying, |
- existing mocks are returned, and the __init__ params are verified. |
- |
- See StubOutWithMock vs StubOutClassWithMocks for more detail. |
- """ |
- |
- def __init__(self, class_to_mock, mox_instance): |
- MockObject.__init__(self, class_to_mock) |
- self._mox = mox_instance |
- self._instance_queue = collections.deque() |
- |
- def __call__(self, *params, **named_params): |
- """Instantiate and record that a new mock has been created.""" |
- |
- method = getattr(self._class_to_mock, '__init__') |
- mock_method = self._CreateMockMethod('__init__', method_to_mock=method) |
- # Note: calling mock_method() is deferred in order to catch the |
- # empty instance_queue first. |
- |
- if self._replay_mode: |
- if not self._instance_queue: |
- raise UnexpectedMockCreationError(self._class_to_mock, *params, |
- **named_params) |
- |
- mock_method(*params, **named_params) |
- |
- return self._instance_queue.pop() |
- else: |
- mock_method(*params, **named_params) |
- |
- instance = self._mox.CreateMock(self._class_to_mock) |
- self._instance_queue.appendleft(instance) |
- return instance |
- |
- def _Verify(self): |
- """Verify that all mocks have been created.""" |
- if self._instance_queue: |
- raise ExpectedMockCreationError(self._instance_queue) |
- super(_MockObjectFactory, self)._Verify() |
- |
- |
-class MethodSignatureChecker(object): |
- """Ensures that methods are called correctly.""" |
- |
- _NEEDED, _DEFAULT, _GIVEN = range(3) |
- |
- def __init__(self, method, class_to_bind=None): |
- """Creates a checker. |
- |
- Args: |
- # method: A method to check. |
- # class_to_bind: optionally, a class used to type check first |
- # method parameter, only used with unbound methods |
- method: function |
- class_to_bind: type or None |
- |
- Raises: |
- ValueError: method could not be inspected, so checks aren't |
- possible. Some methods and functions like built-ins |
- can't be inspected. |
- """ |
- try: |
- self._args, varargs, varkw, defaults = inspect.getargspec(method) |
- except TypeError: |
- raise ValueError('Could not get argument specification for %r' |
- % (method,)) |
- if inspect.ismethod(method) or class_to_bind: |
- self._args = self._args[1:] # Skip 'self'. |
- self._method = method |
- self._instance = None # May contain the instance this is bound to. |
- self._instance = getattr(method, "__self__", None) |
- |
- # _bounded_to determines whether the method is bound or not |
- if self._instance: |
- self._bounded_to = self._instance.__class__ |
- else: |
- self._bounded_to = class_to_bind or getattr(method, "im_class", |
- None) |
- |
- self._has_varargs = varargs is not None |
- self._has_varkw = varkw is not None |
- if defaults is None: |
- self._required_args = self._args |
- self._default_args = [] |
- else: |
- self._required_args = self._args[:-len(defaults)] |
- self._default_args = self._args[-len(defaults):] |
- |
- def _RecordArgumentGiven(self, arg_name, arg_status): |
- """Mark an argument as being given. |
- |
- Args: |
- # arg_name: The name of the argument to mark in arg_status. |
- # arg_status: Maps argument names to one of |
- # _NEEDED, _DEFAULT, _GIVEN. |
- arg_name: string |
- arg_status: dict |
- |
- Raises: |
- AttributeError: arg_name is already marked as _GIVEN. |
- """ |
- if arg_status.get(arg_name, None) == MethodSignatureChecker._GIVEN: |
- raise AttributeError('%s provided more than once' % (arg_name,)) |
- arg_status[arg_name] = MethodSignatureChecker._GIVEN |
- |
- def Check(self, params, named_params): |
- """Ensures that the parameters used while recording a call are valid. |
- |
- Args: |
- # params: A list of positional parameters. |
- # named_params: A dict of named parameters. |
- params: list |
- named_params: dict |
- |
- Raises: |
- AttributeError: the given parameters don't work with the given |
- method. |
- """ |
- arg_status = dict((a, MethodSignatureChecker._NEEDED) |
- for a in self._required_args) |
- for arg in self._default_args: |
- arg_status[arg] = MethodSignatureChecker._DEFAULT |
- |
- # WARNING: Suspect hack ahead. |
- # |
- # Check to see if this is an unbound method, where the instance |
- # should be bound as the first argument. We try to determine if |
- # the first argument (param[0]) is an instance of the class, or it |
- # is equivalent to the class (used to account for Comparators). |
- # |
- # NOTE: If a Func() comparator is used, and the signature is not |
- # correct, this will cause extra executions of the function. |
- if inspect.ismethod(self._method) or self._bounded_to: |
- # The extra param accounts for the bound instance. |
- if len(params) > len(self._required_args): |
- expected = self._bounded_to |
- |
- # Check if the param is an instance of the expected class, |
- # or check equality (useful for checking Comparators). |
- |
- # This is a hack to work around the fact that the first |
- # parameter can be a Comparator, and the comparison may raise |
- # an exception during this comparison, which is OK. |
- try: |
- param_equality = (params[0] == expected) |
- except Exception: |
- param_equality = False |
- |
- if isinstance(params[0], expected) or param_equality: |
- params = params[1:] |
- # If the IsA() comparator is being used, we need to check the |
- # inverse of the usual case - that the given instance is a |
- # subclass of the expected class. For example, the code under |
- # test does late binding to a subclass. |
- elif (isinstance(params[0], IsA) and |
- params[0]._IsSubClass(expected)): |
- params = params[1:] |
- |
- # Check that each positional param is valid. |
- for i in range(len(params)): |
- try: |
- arg_name = self._args[i] |
- except IndexError: |
- if not self._has_varargs: |
- raise AttributeError( |
- '%s does not take %d or more positional ' |
- 'arguments' % (self._method.__name__, i)) |
- else: |
- self._RecordArgumentGiven(arg_name, arg_status) |
- |
- # Check each keyword argument. |
- for arg_name in named_params: |
- if arg_name not in arg_status and not self._has_varkw: |
- raise AttributeError('%s is not expecting keyword argument %s' |
- % (self._method.__name__, arg_name)) |
- self._RecordArgumentGiven(arg_name, arg_status) |
- |
- # Ensure all the required arguments have been given. |
- still_needed = [k for k, v in arg_status.items() |
- if v == MethodSignatureChecker._NEEDED] |
- if still_needed: |
- raise AttributeError('No values given for arguments: %s' |
- % (' '.join(sorted(still_needed)))) |
- |
- |
-class MockMethod(object): |
- """Callable mock method. |
- |
- A MockMethod should act exactly like the method it mocks, accepting |
- parameters and returning a value, or throwing an exception (as specified). |
- When this method is called, it can optionally verify whether the called |
- method (name and signature) matches the expected method. |
- """ |
- |
- def __init__(self, method_name, call_queue, replay_mode, |
- method_to_mock=None, description=None, class_to_bind=None): |
- """Construct a new mock method. |
- |
- Args: |
- # method_name: the name of the method |
- # call_queue: deque of calls, verify this call against the head, |
- # or add this call to the queue. |
- # replay_mode: False if we are recording, True if we are verifying |
- # calls against the call queue. |
- # method_to_mock: The actual method being mocked, used for |
- # introspection. |
- # description: optionally, a descriptive name for this method. |
- # Typically this is equal to the descriptive name of |
- # the method's class. |
- # class_to_bind: optionally, a class that is used for unbound |
- # methods (or functions in Python3) to which method |
- # is bound, in order not to loose binding |
- # information. If given, it will be used for |
- # checking the type of first method parameter |
- method_name: str |
- call_queue: list or deque |
- replay_mode: bool |
- method_to_mock: a method object |
- description: str or None |
- class_to_bind: type or None |
- """ |
- |
- self._name = method_name |
- self.__name__ = method_name |
- self._call_queue = call_queue |
- if not isinstance(call_queue, collections.deque): |
- self._call_queue = collections.deque(self._call_queue) |
- self._replay_mode = replay_mode |
- self._description = description |
- |
- self._params = None |
- self._named_params = None |
- self._return_value = None |
- self._exception = None |
- self._side_effects = None |
- |
- try: |
- self._checker = MethodSignatureChecker(method_to_mock, |
- class_to_bind=class_to_bind) |
- except ValueError: |
- self._checker = None |
- |
- def __call__(self, *params, **named_params): |
- """Log parameters and return the specified return value. |
- |
- If the Mock(Anything/Object) associated with this call is in record |
- mode, this MockMethod will be pushed onto the expected call queue. |
- If the mock is in replay mode, this will pop a MockMethod off the |
- top of the queue and verify this call is equal to the expected call. |
- |
- Raises: |
- UnexpectedMethodCall if this call is supposed to match an expected |
- method call and it does not. |
- """ |
- |
- self._params = params |
- self._named_params = named_params |
- |
- if not self._replay_mode: |
- if self._checker is not None: |
- self._checker.Check(params, named_params) |
- self._call_queue.append(self) |
- return self |
- |
- expected_method = self._VerifyMethodCall() |
- |
- if expected_method._side_effects: |
- result = expected_method._side_effects(*params, **named_params) |
- if expected_method._return_value is None: |
- expected_method._return_value = result |
- |
- if expected_method._exception: |
- raise expected_method._exception |
- |
- return expected_method._return_value |
- |
- def __getattr__(self, name): |
- """Raise an AttributeError with a helpful message.""" |
- |
- raise AttributeError( |
- 'MockMethod has no attribute "%s". ' |
- 'Did you remember to put your mocks in replay mode?' % name) |
- |
- def __iter__(self): |
- """Raise a TypeError with a helpful message.""" |
- raise TypeError( |
- 'MockMethod cannot be iterated. ' |
- 'Did you remember to put your mocks in replay mode?') |
- |
- def next(self): |
- """Raise a TypeError with a helpful message.""" |
- raise TypeError( |
- 'MockMethod cannot be iterated. ' |
- 'Did you remember to put your mocks in replay mode?') |
- |
- def __next__(self): |
- """Raise a TypeError with a helpful message.""" |
- raise TypeError( |
- 'MockMethod cannot be iterated. ' |
- 'Did you remember to put your mocks in replay mode?') |
- |
- def _PopNextMethod(self): |
- """Pop the next method from our call queue.""" |
- try: |
- return self._call_queue.popleft() |
- except IndexError: |
- raise UnexpectedMethodCallError(self, None) |
- |
- def _VerifyMethodCall(self): |
- """Verify the called method is expected. |
- |
- This can be an ordered method, or part of an unordered set. |
- |
- Returns: |
- The expected mock method. |
- |
- Raises: |
- UnexpectedMethodCall if the method called was not expected. |
- """ |
- |
- expected = self._PopNextMethod() |
- |
- # Loop here, because we might have a MethodGroup followed by another |
- # group. |
- while isinstance(expected, MethodGroup): |
- expected, method = expected.MethodCalled(self) |
- if method is not None: |
- return method |
- |
- # This is a mock method, so just check equality. |
- if expected != self: |
- raise UnexpectedMethodCallError(self, expected) |
- |
- return expected |
- |
- def __str__(self): |
- params = ', '.join( |
- [repr(p) for p in self._params or []] + |
- ['%s=%r' % x for x in sorted((self._named_params or {}).items())]) |
- full_desc = "%s(%s) -> %r" % (self._name, params, self._return_value) |
- if self._description: |
- full_desc = "%s.%s" % (self._description, full_desc) |
- return full_desc |
- |
- def __hash__(self): |
- return id(self) |
- |
- def __eq__(self, rhs): |
- """Test whether this MockMethod is equivalent to another MockMethod. |
- |
- Args: |
- # rhs: the right hand side of the test |
- rhs: MockMethod |
- """ |
- |
- return (isinstance(rhs, MockMethod) and |
- self._name == rhs._name and |
- self._params == rhs._params and |
- self._named_params == rhs._named_params) |
- |
- def __ne__(self, rhs): |
- """Test if this MockMethod is not equivalent to another MockMethod. |
- |
- Args: |
- # rhs: the right hand side of the test |
- rhs: MockMethod |
- """ |
- |
- return not self == rhs |
- |
- def GetPossibleGroup(self): |
- """Returns a possible group from the end of the call queue. |
- |
- Return None if no other methods are on the stack. |
- """ |
- |
- # Remove this method from the tail of the queue so we can add it |
- # to a group. |
- this_method = self._call_queue.pop() |
- assert this_method == self |
- |
- # Determine if the tail of the queue is a group, or just a regular |
- # ordered mock method. |
- group = None |
- try: |
- group = self._call_queue[-1] |
- except IndexError: |
- pass |
- |
- return group |
- |
- def _CheckAndCreateNewGroup(self, group_name, group_class): |
- """Checks if the last method (a possible group) is an instance of our |
- group_class. Adds the current method to this group or creates a |
- new one. |
- |
- Args: |
- |
- group_name: the name of the group. |
- group_class: the class used to create instance of this new group |
- """ |
- group = self.GetPossibleGroup() |
- |
- # If this is a group, and it is the correct group, add the method. |
- if isinstance(group, group_class) and group.group_name() == group_name: |
- group.AddMethod(self) |
- return self |
- |
- # Create a new group and add the method. |
- new_group = group_class(group_name) |
- new_group.AddMethod(self) |
- self._call_queue.append(new_group) |
- return self |
- |
- def InAnyOrder(self, group_name="default"): |
- """Move this method into a group of unordered calls. |
- |
- A group of unordered calls must be defined together, and must be |
- executed in full before the next expected method can be called. |
- There can be multiple groups that are expected serially, if they are |
- given different group names. The same group name can be reused if there |
- is a standard method call, or a group with a different name, spliced |
- between usages. |
- |
- Args: |
- group_name: the name of the unordered group. |
- |
- Returns: |
- self |
- """ |
- return self._CheckAndCreateNewGroup(group_name, UnorderedGroup) |
- |
- def MultipleTimes(self, group_name="default"): |
- """Move method into group of calls which may be called multiple times. |
- |
- A group of repeating calls must be defined together, and must be |
- executed in full before the next expected method can be called. |
- |
- Args: |
- group_name: the name of the unordered group. |
- |
- Returns: |
- self |
- """ |
- return self._CheckAndCreateNewGroup(group_name, MultipleTimesGroup) |
- |
- def AndReturn(self, return_value): |
- """Set the value to return when this method is called. |
- |
- Args: |
- # return_value can be anything. |
- """ |
- |
- self._return_value = return_value |
- return return_value |
- |
- def AndRaise(self, exception): |
- """Set the exception to raise when this method is called. |
- |
- Args: |
- # exception: the exception to raise when this method is called. |
- exception: Exception |
- """ |
- |
- self._exception = exception |
- |
- def WithSideEffects(self, side_effects): |
- """Set the side effects that are simulated when this method is called. |
- |
- Args: |
- side_effects: A callable which modifies the parameters or other |
- relevant state which a given test case depends on. |
- |
- Returns: |
- Self for chaining with AndReturn and AndRaise. |
- """ |
- self._side_effects = side_effects |
- return self |
- |
- |
-class Comparator: |
- """Base class for all Mox comparators. |
- |
- A Comparator can be used as a parameter to a mocked method when the exact |
- value is not known. For example, the code you are testing might build up |
- a long SQL string that is passed to your mock DAO. You're only interested |
- that the IN clause contains the proper primary keys, so you can set your |
- mock up as follows: |
- |
- mock_dao.RunQuery(StrContains('IN (1, 2, 4, 5)')).AndReturn(mock_result) |
- |
- Now whatever query is passed in must contain the string 'IN (1, 2, 4, 5)'. |
- |
- A Comparator may replace one or more parameters, for example: |
- # return at most 10 rows |
- mock_dao.RunQuery(StrContains('SELECT'), 10) |
- |
- or |
- |
- # Return some non-deterministic number of rows |
- mock_dao.RunQuery(StrContains('SELECT'), IsA(int)) |
- """ |
- |
- def equals(self, rhs): |
- """Special equals method that all comparators must implement. |
- |
- Args: |
- rhs: any python object |
- """ |
- |
- raise NotImplementedError('method must be implemented by a subclass.') |
- |
- def __eq__(self, rhs): |
- return self.equals(rhs) |
- |
- def __ne__(self, rhs): |
- return not self.equals(rhs) |
- |
- |
-class Is(Comparator): |
- """Comparison class used to check identity, instead of equality.""" |
- |
- def __init__(self, obj): |
- self._obj = obj |
- |
- def equals(self, rhs): |
- return rhs is self._obj |
- |
- def __repr__(self): |
- return "<is %r (%s)>" % (self._obj, id(self._obj)) |
- |
- |
-class IsA(Comparator): |
- """This class wraps a basic Python type or class. It is used to verify |
- that a parameter is of the given type or class. |
- |
- Example: |
- mock_dao.Connect(IsA(DbConnectInfo)) |
- """ |
- |
- def __init__(self, class_name): |
- """Initialize IsA |
- |
- Args: |
- class_name: basic python type or a class |
- """ |
- |
- self._class_name = class_name |
- |
- def equals(self, rhs): |
- """Check to see if the RHS is an instance of class_name. |
- |
- Args: |
- # rhs: the right hand side of the test |
- rhs: object |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return isinstance(rhs, self._class_name) |
- except TypeError: |
- # Check raw types if there was a type error. This is helpful for |
- # things like cStringIO.StringIO. |
- return type(rhs) == type(self._class_name) |
- |
- def _IsSubClass(self, clazz): |
- """Check to see if the IsA comparators class is a subclass of clazz. |
- |
- Args: |
- # clazz: a class object |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return issubclass(self._class_name, clazz) |
- except TypeError: |
- # Check raw types if there was a type error. This is helpful for |
- # things like cStringIO.StringIO. |
- return type(clazz) == type(self._class_name) |
- |
- def __repr__(self): |
- return 'mox.IsA(%s) ' % str(self._class_name) |
- |
- |
-class IsAlmost(Comparator): |
- """Comparison class used to check whether a parameter is nearly equal |
- to a given value. Generally useful for floating point numbers. |
- |
- Example mock_dao.SetTimeout((IsAlmost(3.9))) |
- """ |
- |
- def __init__(self, float_value, places=7): |
- """Initialize IsAlmost. |
- |
- Args: |
- float_value: The value for making the comparison. |
- places: The number of decimal places to round to. |
- """ |
- |
- self._float_value = float_value |
- self._places = places |
- |
- def equals(self, rhs): |
- """Check to see if RHS is almost equal to float_value |
- |
- Args: |
- rhs: the value to compare to float_value |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return round(rhs - self._float_value, self._places) == 0 |
- except Exception: |
- # Probably because either float_value or rhs is not a number. |
- return False |
- |
- def __repr__(self): |
- return str(self._float_value) |
- |
- |
-class StrContains(Comparator): |
- """Comparison class used to check whether a substring exists in a |
- string parameter. This can be useful in mocking a database with SQL |
- passed in as a string parameter, for example. |
- |
- Example: |
- mock_dao.RunQuery(StrContains('IN (1, 2, 4, 5)')).AndReturn(mock_result) |
- """ |
- |
- def __init__(self, search_string): |
- """Initialize. |
- |
- Args: |
- # search_string: the string you are searching for |
- search_string: str |
- """ |
- |
- self._search_string = search_string |
- |
- def equals(self, rhs): |
- """Check to see if the search_string is contained in the rhs string. |
- |
- Args: |
- # rhs: the right hand side of the test |
- rhs: object |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return rhs.find(self._search_string) > -1 |
- except Exception: |
- return False |
- |
- def __repr__(self): |
- return '<str containing \'%s\'>' % self._search_string |
- |
- |
-class Regex(Comparator): |
- """Checks if a string matches a regular expression. |
- |
- This uses a given regular expression to determine equality. |
- """ |
- |
- def __init__(self, pattern, flags=0): |
- """Initialize. |
- |
- Args: |
- # pattern is the regular expression to search for |
- pattern: str |
- # flags passed to re.compile function as the second argument |
- flags: int |
- """ |
- self.flags = flags |
- self.regex = re.compile(pattern, flags=flags) |
- |
- def equals(self, rhs): |
- """Check to see if rhs matches regular expression pattern. |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return self.regex.search(rhs) is not None |
- except Exception: |
- return False |
- |
- def __repr__(self): |
- s = '<regular expression \'%s\'' % self.regex.pattern |
- if self.flags: |
- s += ', flags=%d' % self.flags |
- s += '>' |
- return s |
- |
- |
-class In(Comparator): |
- """Checks whether an item (or key) is in a list (or dict) parameter. |
- |
- Example: |
- mock_dao.GetUsersInfo(In('expectedUserName')).AndReturn(mock_result) |
- """ |
- |
- def __init__(self, key): |
- """Initialize. |
- |
- Args: |
- # key is any thing that could be in a list or a key in a dict |
- """ |
- |
- self._key = key |
- |
- def equals(self, rhs): |
- """Check to see whether key is in rhs. |
- |
- Args: |
- rhs: dict |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return self._key in rhs |
- except Exception: |
- return False |
- |
- def __repr__(self): |
- return '<sequence or map containing \'%s\'>' % str(self._key) |
- |
- |
-class Not(Comparator): |
- """Checks whether a predicates is False. |
- |
- Example: |
- mock_dao.UpdateUsers(Not(ContainsKeyValue('stevepm', |
- stevepm_user_info))) |
- """ |
- |
- def __init__(self, predicate): |
- """Initialize. |
- |
- Args: |
- # predicate: a Comparator instance. |
- """ |
- |
- assert isinstance(predicate, Comparator), ("predicate %r must be a" |
- " Comparator." % predicate) |
- self._predicate = predicate |
- |
- def equals(self, rhs): |
- """Check to see whether the predicate is False. |
- |
- Args: |
- rhs: A value that will be given in argument of the predicate. |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return not self._predicate.equals(rhs) |
- except Exception: |
- return False |
- |
- def __repr__(self): |
- return '<not \'%s\'>' % self._predicate |
- |
- |
-class ContainsKeyValue(Comparator): |
- """Checks whether a key/value pair is in a dict parameter. |
- |
- Example: |
- mock_dao.UpdateUsers(ContainsKeyValue('stevepm', stevepm_user_info)) |
- """ |
- |
- def __init__(self, key, value): |
- """Initialize. |
- |
- Args: |
- # key: a key in a dict |
- # value: the corresponding value |
- """ |
- |
- self._key = key |
- self._value = value |
- |
- def equals(self, rhs): |
- """Check whether the given key/value pair is in the rhs dict. |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return rhs[self._key] == self._value |
- except Exception: |
- return False |
- |
- def __repr__(self): |
- return '<map containing the entry \'%s: %s\'>' % (str(self._key), |
- str(self._value)) |
- |
- |
-class ContainsAttributeValue(Comparator): |
- """Checks whether passed parameter contains attributes with a given value. |
- |
- Example: |
- mock_dao.UpdateSomething(ContainsAttribute('stevepm', stevepm_user_info)) |
- """ |
- |
- def __init__(self, key, value): |
- """Initialize. |
- |
- Args: |
- # key: an attribute name of an object |
- # value: the corresponding value |
- """ |
- |
- self._key = key |
- self._value = value |
- |
- def equals(self, rhs): |
- """Check if the given attribute has a matching value in the rhs object. |
- |
- Returns: |
- bool |
- """ |
- |
- try: |
- return getattr(rhs, self._key) == self._value |
- except Exception: |
- return False |
- |
- |
-class SameElementsAs(Comparator): |
- """Checks whether sequences contain the same elements (ignoring order). |
- |
- Example: |
- mock_dao.ProcessUsers(SameElementsAs('stevepm', 'salomaki')) |
- """ |
- |
- def __init__(self, expected_seq): |
- """Initialize. |
- |
- Args: |
- expected_seq: a sequence |
- """ |
- # Store in case expected_seq is an iterator. |
- self._expected_list = list(expected_seq) |
- |
- def equals(self, actual_seq): |
- """Check to see whether actual_seq has same elements as expected_seq. |
- |
- Args: |
- actual_seq: sequence |
- |
- Returns: |
- bool |
- """ |
- try: |
- # Store in case actual_seq is an iterator. We potentially iterate |
- # twice: once to make the dict, once in the list fallback. |
- actual_list = list(actual_seq) |
- except TypeError: |
- # actual_seq cannot be read as a sequence. |
- # |
- # This happens because Mox uses __eq__ both to check object |
- # equality (in MethodSignatureChecker) and to invoke Comparators. |
- return False |
- |
- try: |
- return set(self._expected_list) == set(actual_list) |
- except TypeError: |
- # Fall back to slower list-compare if any of the objects |
- # are unhashable. |
- if len(self._expected_list) != len(actual_list): |
- return False |
- for el in actual_list: |
- if el not in self._expected_list: |
- return False |
- return True |
- |
- def __repr__(self): |
- return '<sequence with same elements as \'%s\'>' % self._expected_list |
- |
- |
-class And(Comparator): |
- """Evaluates one or more Comparators on RHS, returns an AND of the results. |
- """ |
- |
- def __init__(self, *args): |
- """Initialize. |
- |
- Args: |
- *args: One or more Comparator |
- """ |
- |
- self._comparators = args |
- |
- def equals(self, rhs): |
- """Checks whether all Comparators are equal to rhs. |
- |
- Args: |
- # rhs: can be anything |
- |
- Returns: |
- bool |
- """ |
- |
- for comparator in self._comparators: |
- if not comparator.equals(rhs): |
- return False |
- |
- return True |
- |
- def __repr__(self): |
- return '<AND %s>' % str(self._comparators) |
- |
- |
-class Or(Comparator): |
- """Evaluates one or more Comparators on RHS; returns OR of the results.""" |
- |
- def __init__(self, *args): |
- """Initialize. |
- |
- Args: |
- *args: One or more Mox comparators |
- """ |
- |
- self._comparators = args |
- |
- def equals(self, rhs): |
- """Checks whether any Comparator is equal to rhs. |
- |
- Args: |
- # rhs: can be anything |
- |
- Returns: |
- bool |
- """ |
- |
- for comparator in self._comparators: |
- if comparator.equals(rhs): |
- return True |
- |
- return False |
- |
- def __repr__(self): |
- return '<OR %s>' % str(self._comparators) |
- |
- |
-class Func(Comparator): |
- """Call a function that should verify the parameter passed in is correct. |
- |
- You may need the ability to perform more advanced operations on the |
- parameter in order to validate it. You can use this to have a callable |
- validate any parameter. The callable should return either True or False. |
- |
- |
- Example: |
- |
- def myParamValidator(param): |
- # Advanced logic here |
- return True |
- |
- mock_dao.DoSomething(Func(myParamValidator), true) |
- """ |
- |
- def __init__(self, func): |
- """Initialize. |
- |
- Args: |
- func: callable that takes one parameter and returns a bool |
- """ |
- |
- self._func = func |
- |
- def equals(self, rhs): |
- """Test whether rhs passes the function test. |
- |
- rhs is passed into func. |
- |
- Args: |
- rhs: any python object |
- |
- Returns: |
- the result of func(rhs) |
- """ |
- |
- return self._func(rhs) |
- |
- def __repr__(self): |
- return str(self._func) |
- |
- |
-class IgnoreArg(Comparator): |
- """Ignore an argument. |
- |
- This can be used when we don't care about an argument of a method call. |
- |
- Example: |
- # Check if CastMagic is called with 3 as first arg and |
- # 'disappear' as third. |
- mymock.CastMagic(3, IgnoreArg(), 'disappear') |
- """ |
- |
- def equals(self, unused_rhs): |
- """Ignores arguments and returns True. |
- |
- Args: |
- unused_rhs: any python object |
- |
- Returns: |
- always returns True |
- """ |
- |
- return True |
- |
- def __repr__(self): |
- return '<IgnoreArg>' |
- |
- |
-class Value(Comparator): |
- """Compares argument against a remembered value. |
- |
- To be used in conjunction with Remember comparator. See Remember() |
- for example. |
- """ |
- |
- def __init__(self): |
- self._value = None |
- self._has_value = False |
- |
- def store_value(self, rhs): |
- self._value = rhs |
- self._has_value = True |
- |
- def equals(self, rhs): |
- if not self._has_value: |
- return False |
- else: |
- return rhs == self._value |
- |
- def __repr__(self): |
- if self._has_value: |
- return "<Value %r>" % self._value |
- else: |
- return "<Value>" |
- |
- |
-class Remember(Comparator): |
- """Remembers the argument to a value store. |
- |
- To be used in conjunction with Value comparator. |
- |
- Example: |
- # Remember the argument for one method call. |
- users_list = Value() |
- mock_dao.ProcessUsers(Remember(users_list)) |
- |
- # Check argument against remembered value. |
- mock_dao.ReportUsers(users_list) |
- """ |
- |
- def __init__(self, value_store): |
- if not isinstance(value_store, Value): |
- raise TypeError( |
- "value_store is not an instance of the Value class") |
- self._value_store = value_store |
- |
- def equals(self, rhs): |
- self._value_store.store_value(rhs) |
- return True |
- |
- def __repr__(self): |
- return "<Remember %d>" % id(self._value_store) |
- |
- |
-class MethodGroup(object): |
- """Base class containing common behaviour for MethodGroups.""" |
- |
- def __init__(self, group_name): |
- self._group_name = group_name |
- |
- def group_name(self): |
- return self._group_name |
- |
- def __str__(self): |
- return '<%s "%s">' % (self.__class__.__name__, self._group_name) |
- |
- def AddMethod(self, mock_method): |
- raise NotImplementedError |
- |
- def MethodCalled(self, mock_method): |
- raise NotImplementedError |
- |
- def IsSatisfied(self): |
- raise NotImplementedError |
- |
- |
-class UnorderedGroup(MethodGroup): |
- """UnorderedGroup holds a set of method calls that may occur in any order. |
- |
- This construct is helpful for non-deterministic events, such as iterating |
- over the keys of a dict. |
- """ |
- |
- def __init__(self, group_name): |
- super(UnorderedGroup, self).__init__(group_name) |
- self._methods = [] |
- |
- def __str__(self): |
- return '%s "%s" pending calls:\n%s' % ( |
- self.__class__.__name__, |
- self._group_name, |
- "\n".join(str(method) for method in self._methods)) |
- |
- def AddMethod(self, mock_method): |
- """Add a method to this group. |
- |
- Args: |
- mock_method: A mock method to be added to this group. |
- """ |
- |
- self._methods.append(mock_method) |
- |
- def MethodCalled(self, mock_method): |
- """Remove a method call from the group. |
- |
- If the method is not in the set, an UnexpectedMethodCallError will be |
- raised. |
- |
- Args: |
- mock_method: a mock method that should be equal to a method in the |
- group. |
- |
- Returns: |
- The mock method from the group |
- |
- Raises: |
- UnexpectedMethodCallError if the mock_method was not in the group. |
- """ |
- |
- # Check to see if this method exists, and if so, remove it from the set |
- # and return it. |
- for method in self._methods: |
- if method == mock_method: |
- # Remove the called mock_method instead of the method in the |
- # group. The called method will match any comparators when |
- # equality is checked during removal. The method in the group |
- # could pass a comparator to another comparator during the |
- # equality check. |
- self._methods.remove(mock_method) |
- |
- # If group is not empty, put it back at the head of the queue. |
- if not self.IsSatisfied(): |
- mock_method._call_queue.appendleft(self) |
- |
- return self, method |
- |
- raise UnexpectedMethodCallError(mock_method, self) |
- |
- def IsSatisfied(self): |
- """Return True if there are not any methods in this group.""" |
- |
- return len(self._methods) == 0 |
- |
- |
-class MultipleTimesGroup(MethodGroup): |
- """MultipleTimesGroup holds methods that may be called any number of times. |
- |
- Note: Each method must be called at least once. |
- |
- This is helpful, if you don't know or care how many times a method is |
- called. |
- """ |
- |
- def __init__(self, group_name): |
- super(MultipleTimesGroup, self).__init__(group_name) |
- self._methods = set() |
- self._methods_left = set() |
- |
- def AddMethod(self, mock_method): |
- """Add a method to this group. |
- |
- Args: |
- mock_method: A mock method to be added to this group. |
- """ |
- |
- self._methods.add(mock_method) |
- self._methods_left.add(mock_method) |
- |
- def MethodCalled(self, mock_method): |
- """Remove a method call from the group. |
- |
- If the method is not in the set, an UnexpectedMethodCallError will be |
- raised. |
- |
- Args: |
- mock_method: a mock method that should be equal to a method in the |
- group. |
- |
- Returns: |
- The mock method from the group |
- |
- Raises: |
- UnexpectedMethodCallError if the mock_method was not in the group. |
- """ |
- |
- # Check to see if this method exists, and if so add it to the set of |
- # called methods. |
- for method in self._methods: |
- if method == mock_method: |
- self._methods_left.discard(method) |
- # Always put this group back on top of the queue, |
- # because we don't know when we are done. |
- mock_method._call_queue.appendleft(self) |
- return self, method |
- |
- if self.IsSatisfied(): |
- next_method = mock_method._PopNextMethod() |
- return next_method, None |
- else: |
- raise UnexpectedMethodCallError(mock_method, self) |
- |
- def IsSatisfied(self): |
- """Return True if all methods in group are called at least once.""" |
- return len(self._methods_left) == 0 |
- |
- |
-class MoxMetaTestBase(type): |
- """Metaclass to add mox cleanup and verification to every test. |
- |
- As the mox unit testing class is being constructed (MoxTestBase or a |
- subclass), this metaclass will modify all test functions to call the |
- CleanUpMox method of the test class after they finish. This means that |
- unstubbing and verifying will happen for every test with no additional |
- code, and any failures will result in test failures as opposed to errors. |
- """ |
- |
- def __init__(cls, name, bases, d): |
- type.__init__(cls, name, bases, d) |
- |
- # also get all the attributes from the base classes to account |
- # for a case when test class is not the immediate child of MoxTestBase |
- for base in bases: |
- for attr_name in dir(base): |
- if attr_name not in d: |
- d[attr_name] = getattr(base, attr_name) |
- |
- for func_name, func in d.items(): |
- if func_name.startswith('test') and callable(func): |
- |
- setattr(cls, func_name, MoxMetaTestBase.CleanUpTest(cls, func)) |
- |
- @staticmethod |
- def CleanUpTest(cls, func): |
- """Adds Mox cleanup code to any MoxTestBase method. |
- |
- Always unsets stubs after a test. Will verify all mocks for tests that |
- otherwise pass. |
- |
- Args: |
- cls: MoxTestBase or subclass; the class whose method we are |
- altering. |
- func: method; the method of the MoxTestBase test class we wish to |
- alter. |
- |
- Returns: |
- The modified method. |
- """ |
- def new_method(self, *args, **kwargs): |
- mox_obj = getattr(self, 'mox', None) |
- stubout_obj = getattr(self, 'stubs', None) |
- cleanup_mox = False |
- cleanup_stubout = False |
- if mox_obj and isinstance(mox_obj, Mox): |
- cleanup_mox = True |
- if stubout_obj and isinstance(stubout_obj, |
- stubout.StubOutForTesting): |
- cleanup_stubout = True |
- try: |
- func(self, *args, **kwargs) |
- finally: |
- if cleanup_mox: |
- mox_obj.UnsetStubs() |
- if cleanup_stubout: |
- stubout_obj.UnsetAll() |
- stubout_obj.SmartUnsetAll() |
- if cleanup_mox: |
- mox_obj.VerifyAll() |
- new_method.__name__ = func.__name__ |
- new_method.__doc__ = func.__doc__ |
- new_method.__module__ = func.__module__ |
- return new_method |
- |
- |
-_MoxTestBase = MoxMetaTestBase('_MoxTestBase', (unittest.TestCase, ), {}) |
- |
- |
-class MoxTestBase(_MoxTestBase): |
- """Convenience test class to make stubbing easier. |
- |
- Sets up a "mox" attribute which is an instance of Mox (any mox tests will |
- want this), and a "stubs" attribute that is an instance of |
- StubOutForTesting (needed at times). Also automatically unsets any stubs |
- and verifies that all mock methods have been called at the end of each |
- test, eliminating boilerplate code. |
- """ |
- |
- def setUp(self): |
- super(MoxTestBase, self).setUp() |
- self.mox = Mox() |
- self.stubs = stubout.StubOutForTesting() |