Using python s mock patch object to change the return value of a method
There are two ways you can do this with patch and with patch object Patch assumes that you are not directly importing the object but that it is being used by the object you are testing as in the following
Unittest mock mock object library Python 3 12 1 documentation, If the mock has an explicit return value set then calls are not passed to the wrapped object and the return value is returned instead name If the mock has a name then it will be used in the repr of the mock This can be useful for debugging patch object patch object target attribute new DEFAULT
Unittest mock getting started Python 3 12 1 documentation
It also optionally takes a value that you want the attribute or class or whatever to be replaced with patch object takes an object and the name of the attribute you would like patched plus optionally the value to patch it with patch object
Python returns MagicMock object instead of return value, When you mock patch a A you are replacing the class A in the code under test with mock a In B method b you then set a A which is now a mock a i e a is the return value of mock a As you haven t specified this value it s a regular MagicMock this isn t configured either so you get the default response yet another MagicMock when calling methods on it
Trying to mock method in Object gives AttributeError
Trying to mock method in Object gives AttributeError , 6 I am trying to test a method in an already existing class Within inputStreamThread method in the Foo crawler crawlerapp CrawlerApp class the method addUrl is called inputStreamThread reads from stdin and then calls addUrl addUrl is also in the CrawlerApp class I was hoping to be able to use assert called with on a mock addUrl to check
AttributeError list Object Has No Attribute reshape Solved
Python mock class attributes are not accessible Stack Overflow
Python mock class attributes are not accessible Stack Overflow 3 When mocking a class object I can t access it s attributes I ve read a lot of documentation but I m new to mocking and don t see the problem with this code I expect x and y to return the same value 1e 15 class test user data scale 1e 15 class test signal unittest TestCase patch xx user data autospec test user data spec set
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The Python Mock Library The Python mock object library is unittest mock It provides an easy way to introduce mocks into your tests Note The standard library includes unittest mock in Python 3 3 and later If you re using an older version of Python you ll need to install the official backport of the library Understanding the Python Mock Object Library Real Python. Again by default mock patch object just creates a new mock object to use On line 9 by assigning an exception to the side effect attribute of the mock object we indicate that when called instead of returning a value the exception should be raised Our function is supposed to catch the exception and return None so we check in the usual From unittest mock import patch def test function b mock an object of class with patch object MyClass sayhi return value hi i m a mock object the MyClass object used within function b will be replaced by a mock defined in the patch object call above assert function b hi i m a mock object
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