The problem is writing unit tests and need to apply patches to selected objects in order to make assertions about how they were used in the test (e.g., assertions about being called with certain parameters, access to selected attributes, etc.).
To do so, the
unittest.mock.patch() function can be used to help with this problem. It’s a little unusual, but
patch() can be used as a decorator, a context manager, or stand-alone.
unittest.mock.patchas a decorator
Code #2: Using
unittest.mock.patch as a decorator
Code #3: Using
unittest.mock.patch to patch things manually.
Code #4: Stacking decorators and context managers to patch multiple objects
patch() works by taking an existing object with the fully qualified name that you provide and replacing it with a new value. The original value is then restored after the completion of the decorated function or context manager. By default, values are replaced with MagicMock instances.
Code #5 : Example
<MagicMock name='x' id='4314230032'> 42
- Python | Unit Test Objects Patching | Set-2
- Monkey Patching in Python (Dynamic Behavior)
- Reading Python File-Like Objects from C | Python
- Unit Testing in Python - Unittest
- Barrier Objects in Python
- Timer Objects in Python
- File Objects in Python
- Mutable vs Immutable Objects in Python
- Byte Objects vs String in Python
- Python | Counter Objects | elements()
- Python | Exceptional Conditions Testing in Unit Tests
- Phyllotaxis pattern in Python | A unit of Algorithmic Botany
- Python | Draw rectangular shape and extract objects using OpenCV
- Python Tkinter | Moving objects using Canvas.move() method
- Python | Test for nested list
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.