Mock call assertions in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a mock call assertion in pytest?

A mock call assertion checks if a mocked function was called as expected during a test. It helps verify interactions without running real code.

beginner

How do you assert that a mock was called exactly once in pytest?

Use mock_function.assert_called_once() to check the mock was called exactly one time.

beginner

What does assert_called_with() do in mock assertions?

It checks that the mock was called with specific arguments at least once during the test.

intermediate

Explain the difference between assert_called_once_with() and assert_called_with().

assert_called_once_with() checks the mock was called exactly once with the given arguments. assert_called_with() checks the mock was called at least once with those arguments, but can be multiple times.

intermediate

How can you check the order of multiple calls to a mock?

Use mock_function.call_args_list to get a list of all calls in order, then assert each call's arguments.

Which method asserts a mock was called exactly once with specific arguments?

A assert_called_once()

B assert_called_with()

C assert_called_once_with()

D assert_any_call()

assert_called_once_with() checks the mock was called exactly once with the given arguments.

What does mock_function.assert_called() verify?

A Mock was called at least once

B Mock was called exactly once

C Mock was never called

D Mock was called with specific arguments

assert_called() verifies the mock was called at least once, regardless of arguments.

How do you check if a mock was called with certain arguments at least once?

A assert_called_once()

B assert_called_with()

C assert_any_call()

D assert_not_called()

assert_called_with() checks the mock was called at least once with the specified arguments.

Which attribute holds the list of all calls made to a mock?

A call_args_list

B call_args

C called

D call_count

call_args_list contains all calls made to the mock in order.

What happens if assert_called_once() is used but the mock was called twice?

A Test raises a warning but passes

B Test passes

C Test skips

D Test fails with an assertion error

assert_called_once() fails if the mock was called more than once.

Describe how to verify a mock function was called with specific arguments exactly once in pytest.

Think about the assertion method that combines call count and arguments.

Explain how to check the order and arguments of multiple calls made to a mock.

Look for a list that records all calls.