Fixture teardown (yield) in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of using yield in a pytest fixture?

Using yield in a pytest fixture allows you to separate setup and teardown code. The code before yield runs before the test, and the code after yield runs after the test to clean up.

beginner

How does pytest know when to run the teardown code in a fixture using yield?

Pytest runs the code after yield automatically after the test that uses the fixture finishes, even if the test fails or raises an error.

beginner

Write a simple pytest fixture using yield that prints 'Setup' before the test and 'Teardown' after the test.

import pytest

@pytest.fixture
def my_fixture():
    print('Setup')
    yield
    print('Teardown')

intermediate

Why is using yield in fixtures better than using request.addfinalizer() for teardown?

Using yield keeps setup and teardown code together in one place, making the fixture easier to read and maintain. It also works naturally with Python's generator syntax.

intermediate

Can the teardown code after yield in a pytest fixture modify the value returned to the test?

No. The value yielded is sent to the test function before the teardown code runs. The teardown code runs after the test and cannot change the yielded value.

What happens to the code after yield in a pytest fixture?

A It runs only if the test passes

B It runs before the test starts

C It runs after the test finishes

D It never runs

The code after yield runs after the test finishes, regardless of test outcome.

Which keyword is used in pytest fixtures to separate setup and teardown code?

A return

B break

C continue

D yield

yield separates setup (before) and teardown (after) code in pytest fixtures.

If a pytest fixture uses yield, when is the setup code executed?

A Before the test

B Never

C Only if the test fails

D After the test

Setup code runs before the test, before the yield statement.

What is a benefit of using yield in pytest fixtures?

A It allows multiple tests to run in parallel

B It combines setup and teardown in one function

C It skips the test automatically

D It disables fixture caching

yield lets you write setup and teardown code together in one fixture function.

Can teardown code after yield modify the fixture value used by the test?

A No, teardown runs after test uses the value

B Yes, anytime

C Only if the test passes

D Only if the test fails

Teardown code runs after the test uses the yielded value, so it cannot change it.

Explain how to use yield in a pytest fixture to handle setup and teardown.

Think of yield as a pause between setup and cleanup.

Describe why using yield in fixtures is preferred over request.addfinalizer().

Focus on code clarity and maintenance.