Running tests by marker (-m) in PyTest - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the pytest marker -m option do?

The -m option in pytest runs only the tests that have a specific marker. It helps to select tests by tags or categories.

beginner

How do you mark a test function with a custom marker in pytest?

Use the @pytest.mark.marker_name decorator above the test function to assign a marker.

beginner

Example: How to run only tests marked as slow using pytest command line?

Run pytest -m slow to execute only tests marked with @pytest.mark.slow.

intermediate

What happens if you run pytest -m 'not slow'?

Pytest runs all tests that do NOT have the slow marker. The not keyword excludes tests with that marker.

intermediate

Why should you register custom markers in pytest.ini?

Registering markers in pytest.ini avoids warnings and documents the purpose of each marker for better test management.

Which pytest command runs only tests marked with fast?

A pytest -k fast

B pytest --fast

C pytest -m fast

D pytest --marker fast

The -m option filters tests by marker name, so pytest -m fast runs tests marked with @pytest.mark.fast.

How do you mark a test as database in pytest?

A @database.mark

B @pytest.database

C @mark.database

D @pytest.mark.database

The correct syntax is @pytest.mark.database to assign the database marker to a test.

What does pytest -m 'slow or network' do?

A Runs tests marked with both slow and network

B Runs tests marked with slow or network

C Runs tests without slow or network markers

D Runs all tests except slow and network

The or operator runs tests that have either slow or network markers.

Why add markers to pytest.ini?

A To avoid warnings and document markers

B To run tests in parallel

C To disable markers

D To speed up test execution

Registering markers in pytest.ini prevents warnings about unknown markers and helps document their use.

What is the result of pytest -m 'not network'?

A Runs tests without the network marker

B Runs only network tests

C Runs all tests

D Runs tests with network and other markers

The not operator excludes tests with the network marker, running only tests without it.

Explain how to use pytest markers to run a specific group of tests.

Think about tagging tests and selecting them by tag.

Describe why and how to register custom markers in pytest configuration.

Consider configuration files and team collaboration.