Mock call assertions in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assert the mock was called exactly once.

PyTest

mock_function.[1]()

Drag options to blanks, or click blank then click option'

Aassert_called

Bassert_called_once

Cassert_called_once_with

Dassert_not_called

Attempts:

3 left

💡 Hint

Common Mistakes

Using assert_called_once_with without specifying arguments

Using assert_called which only checks if called at least once

The assert_called_once() method checks that the mock was called exactly one time.

2fill in blank

medium

Complete the code to assert the mock was called with specific arguments.

PyTest

mock_function.[1](42, 'test')

Drag options to blanks, or click blank then click option'

Aassert_not_called

Bassert_called

Cassert_called_with

Dassert_called_once_with

Attempts:

3 left

💡 Hint

Common Mistakes

Using assert_called_with which allows multiple calls

Using assert_called which ignores arguments

The assert_called_once_with() method asserts the mock was called exactly once with the given arguments.

3fill in blank

hard

Fix the error in the assertion to check the mock was never called.

PyTest

mock_function.[1]()

Drag options to blanks, or click blank then click option'

Aassert_not_called

Bassert_called

Cassert_called_once

Dassert_called_once_with

Attempts:

3 left

💡 Hint

Common Mistakes

Using assert_called which expects at least one call

Using assert_called_once which expects exactly one call

The assert_not_called() method asserts the mock was never called.

4fill in blank

hard

Fill both blanks to assert the mock was called twice and with specific arguments on the second call.

PyTest

assert mock_function.call_count == [1]
mock_function.[2](100, key='value')

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A2

Bassert_called_once_with

Cassert_any_call

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using assert_called_once_with which only checks one call

Checking call_count equals 3 instead of 2

First, we check the call count equals 2. Then, assert_any_call() checks if the mock was called with the given arguments at least once (e.g., the second call).

5fill in blank

hard

Fill all three blanks to assert the mock was called with specific arguments and check the first call's arguments.

PyTest

mock_function.[1](5, 10)
assert mock_function.call_args == [2]
assert mock_function.call_args_list[0] == [3]

Drag options to blanks, or click blank then click option'

Aassert_called_with

B(5, 10)

C((5, 10), {})

Dassert_called_once_with

Attempts:

3 left

💡 Hint

Common Mistakes

Using assert_called_with which allows multiple calls

Using (5, 10) instead of ((5, 10), {}) for the Call object

assert_called_once_with asserts the mock was called once with the arguments (5, 10). call_args holds the last call's Call ((5, 10), {}). call_args_list[0] holds the first call's Call ((5, 10), {}).