unittest.mock provides a class called Mock which you will use to imitate real objects in your codebase.Mock offers incredible flexibility and insightful data. patch will forward keyword arguments to the Mock class, so to configure a return_value we simply add it as one: Mocking classes It’s quite common to patch classes completely or partially. Here are the examples of the python api mock.return_value taken from open source projects. How to return a Enum value from a string? os_stat.return_value by default, returns a new Mock object instance that will be substituted for the constructor method's return value (the stat object instance) - in the scope of def test, which includes the nested function call to original_func. However, it turns out side_effect has more interesting applications…. I want to mock out this class using the Python Mock library. How to Mock a javax.servlet.ServletInputStream; To Verify a mock, is a return required to verify; How to return a particular value from a method? This, along with its subclasses, will meet most Python mocking needs that you will face in your tests. My favorite documentation is objective-based: I’m trying to achieve X objective, here are some examples of how library Y can help. The Mock class has a few input arguments, most of them (like return_value ) are easy to remember. class Foo: def method_1(): results = uses_some_other_method() def method_n(): results = uses_some_other_method() Okay, suppose the above code is in foo.py, uses_some_other_method … How do I attach the return value of mock.patch(…).start() to a parent mock? The rule is simple – if a value passed as side_effect is an Exception class or instance, it will get raised. But then there is name , which nobody ever remembers. It doesn’t happen all that often, but sometimes when writing unit tests you want to mock a property and specify a return value. How to mock properties in Python using PropertyMock. Instead of calling the actual method, you want to mock the return value. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Questions: I have a class that I’m testing which has as a dependency another class (an instance of which gets passed to the CUT’s init method). By voting up you can indicate which examples are most useful and appropriate. The following are 30 code examples for showing how to use unittest.mock.return_value().These examples are extracted from open source projects. The library also provides a function, called patch(), which replaces the real objects in your code with Mock instances. Returning a few different values from Mock, raising different exceptions . 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