Marker registration in PyTest - Test Execution Trace

Test Overview

This test checks that a pytest marker named slow is properly registered and can be used to mark a test. It verifies that the marker is recognized and the test runs successfully.

Test Code - pytest

PyTest

import pytest

@pytest.mark.slow
def test_example():
    assert 1 + 1 == 2

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Pytest starts and loads test modules	Pytest environment initialized with registered markers	-	PASS
2	Pytest discovers test_example marked with @pytest.mark.slow	Test function test_example is found with marker 'slow'	Check marker 'slow' is registered and recognized	PASS
3	Pytest runs test_example	Test executes the assertion 1 + 1 == 2	Assert that 1 + 1 equals 2	PASS
4	Pytest reports test_example as passed	Test suite shows test_example passed with marker 'slow'	-	PASS

Failure Scenario

Failing Condition: Marker 'slow' is not registered in pytest.ini or pytest configuration

Execution Trace Quiz - 3 Questions

What does the @pytest.mark.slow decorator do in the test?

A It runs the test twice

B It marks the test as slow so pytest can identify it

C It skips the test automatically

D It changes the test assertion

Key Result

Always register custom markers in pytest.ini or pytest configuration to avoid warnings and ensure tests using them run correctly.