pytest-cov setup - Test Execution Trace

Test Overview

This test checks that pytest-cov is correctly set up to measure code coverage during pytest test runs. It verifies that coverage data is collected and reported.

Test Code - PyTest

PyTest

import pytest

def add(a, b):
    return a + b

def test_add():
    assert add(2, 3) == 5

# Run this test with coverage using:
# pytest --cov=.

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts pytest with coverage option '--cov=.'	Terminal shows pytest starting and coverage plugin initializing	-	PASS
2	Pytest discovers test_add function and runs it	Test function executes in Python environment	assert add(2, 3) == 5	PASS
3	pytest-cov collects coverage data for the add function	Coverage data is recorded in memory	-	PASS
4	pytest finishes and outputs coverage report to terminal	Terminal displays coverage summary showing 100% coverage for add function	Coverage report shows 100% lines covered	PASS

Failure Scenario

Failing Condition: pytest-cov plugin is not installed or coverage option is missing

Execution Trace Quiz - 3 Questions

What does the '--cov=.' option do when running pytest?

A It runs tests in parallel

B It skips all tests

C It measures code coverage for the current directory

D It disables assertions

Key Result

Always verify that the coverage plugin is installed and the coverage option is correctly passed to pytest to ensure coverage data is collected.