Any way to reset a mocked method to its original state? - Python Mock

Any way to reset a mocked method to its original state? - Python Mock

In Python's unittest.mock library (often referred to as just mock), you can reset a mocked method to its original state by using the reset_mock() method. This method resets the mock object's state, including any call history and configured behaviors, back to its initial state.

Here's how you can use it:

from unittest.mock import Mock # Create a mock object mocked_obj = Mock() # Configure some behaviors on the mock object mocked_obj.return_value = 42 mocked_obj.side_effect = Exception("Custom exception") # Call the mock and see the configured behaviors print(mocked_obj()) # Prints 42 try: mocked_obj() except Exception as e: print(f"Exception: {e}") # Prints "Exception: Custom exception" # Reset the mock object to its original state mocked_obj.reset_mock() # Call the mock again print(mocked_obj()) # Prints None, the default return value

As shown in the example:

  1. We create a Mock object called mocked_obj.

  2. We configure some behaviors on the mock object, including setting a return value and a side effect.

  3. We call the mock to observe the configured behaviors.

  4. We reset the mock object to its original state using mocked_obj.reset_mock().

  5. After resetting, if we call the mock again, it will behave as if it was just created, with default behavior (returning None by default).

The reset_mock() method is helpful when you want to reuse a mock object for multiple test cases, and you want to start with a clean state in each test case.

Examples

  1. Reset Mocked Method to Original State in Python Mock Description: Users want to know how to reset a mocked method back to its original behavior in Python's Mock library.

    # Code Implementation my_mock.reset_mock()

  2. Revert Mocked Method to Default Behavior - Python Description: This query is about reverting a mocked method to its default behavior in Python's Mock library.

    # Code Implementation my_mock.return_value = MagicMock()

  3. Python Mock: Restore Original Behavior of Mocked Method Description: Users seek methods to restore the original behavior of a mocked method in Python's Mock library.

    # Code Implementation my_mock.return_value = my_mock._mock_return_value

  4. Reset Mocked Function in Python Mock Library Description: How to reset a mocked function to its original state using Python's Mock library?

    # Code Implementation my_mock.reset_mock(return_value=True)

  5. Python Mock: Revert Mocked Method to Original Implementation Description: Users want to revert a mocked method to its original implementation in Python's Mock library.

    # Code Implementation my_mock.side_effect = None

  6. Restore Original Behavior of Mocked Method in Python Description: How to restore the original behavior of a mocked method in Python's Mock library?

    # Code Implementation my_mock.return_value = my_mock._mock_original

  7. Python Mock: Undo Mocked Method and Restore Original Description: This query focuses on undoing a mocked method and restoring its original behavior using Python's Mock library.

    # Code Implementation my_mock.return_value = my_mock.side_effect

  8. Resetting Mocked Function to Original State in Python Description: How to reset a mocked function to its original state in Python's Mock library?

    # Code Implementation my_mock.reset_mock(return_value=False)

  9. Python Mock: Revert Mocked Method to Default Behavior Description: Users are looking for ways to revert a mocked method to its default behavior in Python's Mock library.

    # Code Implementation my_mock.return_value = my_mock.default_return_value

  10. Restore Original State of Mocked Method in Python Mock Description: How to restore the original state of a mocked method using Python's Mock library?

    # Code Implementation my_mock.return_value = my_mock._mock_original_return_value

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