How to check if a function was called in a unit test using pytest-mock?

How to check if a function was called in a unit test using pytest-mock?

To check if a function was called in a unit test using pytest-mock, you can use the assert_called method provided by the mocker object. pytest-mock provides functionality to work with the unittest.mock library, which is now part of the Python standard library as unittest.mock.

Here's how you can use pytest-mock to assert that a function was called in a unit test:

  • Install pytest and pytest-mock:

    If you haven't already, install pytest and pytest-mock using pip:

    pip install pytest pytest-mock

  • Write the Unit Test:

    Let's assume you have a simple function multiply that multiplies two numbers and calls another function log_product to log the product. Here's how you can write a unit test to check if log_product is called using pytest-mock:

    # main_module.py def multiply(a, b): product = a * b log_product(product) def log_product(product): print("Product:", product) # test_main_module.py import pytest from main_module import multiply, log_product def test_multiply_called_log_product(mocker): mocker.patch('main_module.log_product') # Mock the log_product function multiply(2, 3) log_product.assert_called_once()

    In this example, we're using mocker.patch to mock the log_product function. Then, we call the multiply function and use log_product.assert_called_once() to assert that the log_product function was called exactly once.

Remember to replace 'main_module.log_product' with the correct import path to the function you want to mock.

  • Run the Test:

    Run the test using the pytest command:

    pytest test_main_module.py

The pytest-mock library simplifies the process of mocking functions and methods in unit tests using the unittest.mock library. It provides a convenient interface to perform assertions on mocked objects and their method calls.

Examples

  1. "pytest-mock check if function was called" Description: Learn how to use pytest-mock to check if a specific function was called during a unit test in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call def test_function_call(mocker): # Call function my_function() # Check if function was called mocker.assert_called_once_with(my_function)

  2. "pytest-mock assert function call" Description: Understand how to assert that a particular function was called during a unit test using pytest-mock in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call def test_function_call(mocker): # Call function my_function() # Assert function call mocker.assert_called_once_with(my_function)

  3. "pytest-mock check if function was not called" Description: Find out how to use pytest-mock to verify if a specific function was not called during a unit test in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call def test_function_not_called(mocker): # Do not call function # Check if function was not called mocker.assert_not_called(my_function)

  4. "pytest-mock assert function not called" Description: Explore how to assert that a particular function was not called during a unit test using pytest-mock in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call def test_function_not_called(mocker): # Do not call function # Assert function was not called mocker.assert_not_called(my_function)

  5. "pytest-mock check function call count" Description: Learn how to check the number of times a specific function was called during a unit test using pytest-mock in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call count def test_function_call_count(mocker): # Call function multiple times my_function() my_function() # Check function call count assert mocker.call_count == 2

  6. "pytest-mock assert function call count" Description: Understand how to assert the number of times a particular function was called during a unit test using pytest-mock in Python. Code:

    import pytest # Define function to test def my_function(): pass # Test function call count def test_function_call_count(mocker): # Call function multiple times my_function() my_function() # Assert function call count assert mocker.call_count == 2

  7. "pytest-mock check function call arguments" Description: Find out how to use pytest-mock to check the arguments with which a specific function was called during a unit test in Python. Code:

    import pytest # Define function to test def my_function(x, y): pass # Test function call with arguments def test_function_call_with_arguments(mocker): # Call function with arguments my_function(10, 20) # Check function call with arguments mocker.assert_called_once_with(my_function, 10, 20)

  8. "pytest-mock assert function call arguments" Description: Explore how to assert the arguments with which a particular function was called during a unit test using pytest-mock in Python. Code:

    import pytest # Define function to test def my_function(x, y): pass # Test function call with arguments def test_function_call_with_arguments(mocker): # Call function with arguments my_function(10, 20) # Assert function call with arguments mocker.assert_called_once_with(my_function, 10, 20)

  9. "pytest-mock check function call order" Description: Learn how to use pytest-mock to check the order of function calls during a unit test in Python. Code:

    import pytest # Define functions to test def function1(): pass def function2(): pass # Test function call order def test_function_call_order(mocker): # Call functions in specific order function1() function2() # Check function call order mocker.assert_has_calls([mocker.call(function1()), mocker.call(function2())])

  10. "pytest-mock assert function call order" Description: Understand how to assert the order of function calls during a unit test using pytest-mock in Python. Code:

    import pytest # Define functions to test def function1(): pass def function2(): pass # Test function call order def test_function_call_order(mocker): # Call functions in specific order function1() function2() # Assert function call order mocker.assert_has_calls([mocker.call(function1()), mocker.call(function2())])

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