Dynamic fixture selection in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a fixture in pytest?

A fixture in pytest is a function that sets up some context or data needed for tests. It helps prepare the environment before a test runs and can clean up afterward.

intermediate

What does dynamic fixture selection mean in pytest?

Dynamic fixture selection means choosing which fixture to use during a test run based on some condition, like test parameters or environment, instead of always using the same fixture.

intermediate

How can you select a fixture dynamically in pytest?

You can select a fixture dynamically by using the `request` object inside a fixture or test, or by using `pytest` hooks or parameterization to decide which fixture to use.

advanced

Example: How to use `request.getfixturevalue` for dynamic fixture selection?

Inside a fixture or test, you can call `request.getfixturevalue('fixture_name')` where `'fixture_name'` is a string chosen at runtime. This lets you call different fixtures based on conditions.

beginner

Why is dynamic fixture selection useful?

It helps write flexible tests that can adapt to different setups or inputs without repeating code. This saves time and keeps tests clean and maintainable.

What pytest feature allows you to choose a fixture at runtime?

A assert statement

B request.getfixturevalue()

C pytest.mark.skip

D pytest.raises()

The request object has a method getfixturevalue() that lets you get a fixture by name dynamically during test execution.

Which pytest object is commonly used for dynamic fixture selection?

A request

B capfd

C tmp_path

D monkeypatch

The request object provides access to test context and fixtures, enabling dynamic fixture selection.

Dynamic fixture selection helps to:

A Run the same fixture for all tests

B Generate test reports

C Skip tests automatically

D Choose fixtures based on conditions during test run

Dynamic fixture selection allows choosing which fixture to use based on runtime conditions.

Which of these is NOT a way to select fixtures dynamically?

A Using request.getfixturevalue()

B Using pytest hooks

C Using assert statements

D Using parameterization

Assert statements check conditions but do not select fixtures dynamically.

What is the main benefit of dynamic fixture selection?

A More flexible and reusable tests

B Faster test execution

C Automatic bug fixing

D Better test reporting

Dynamic fixture selection makes tests flexible and reusable by adapting fixtures to different needs.

Explain how you can implement dynamic fixture selection in pytest using the request object.

Think about how to get a fixture by name inside another fixture or test.

Describe why dynamic fixture selection is helpful in writing tests.

Consider how tests can change behavior without rewriting code.