import subprocess
import sys
import os
# Step 1: Install pytest-cov
subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'pytest-cov'])
# Step 2: Create calculator.py
calculator_code = '''
def add(a, b):
return a + b
'''
with open('calculator.py', 'w') as f:
f.write(calculator_code)
# Step 3: Create test_calculator.py
test_code = '''
import calculator
def test_add():
assert calculator.add(2, 3) == 5
'''
with open('test_calculator.py', 'w') as f:
f.write(test_code)
# Step 4: Run pytest with coverage
result = subprocess.run([
sys.executable, '-m', 'pytest', '--cov=calculator', '--cov-report=term', 'test_calculator.py'
], capture_output=True, text=True)
# Step 5: Print output
print(result.stdout)
# Assert coverage report presence
assert 'coverage' in result.stdout.lower() or '100%' in result.stdout, 'Coverage report not found in output'
# Assert test passed
assert '1 passed' in result.stdout, 'Test did not pass as expected'
# Cleanup created files
os.remove('calculator.py')
os.remove('test_calculator.py')This script automates the setup and verification of pytest-cov coverage reporting.
First, it installs pytest-cov using pip to ensure coverage measurement is available.
Then, it creates a simple Python module calculator.py with an add function.
Next, it writes a test file test_calculator.py that tests the add function using pytest.
It runs pytest with the --cov=calculator option to measure coverage only on the calculator module and requests a terminal coverage report.
The script captures and prints the test run output, then asserts that the coverage report and test pass message appear in the output.
Finally, it cleans up the created files to keep the environment tidy.
This approach ensures the coverage tool is correctly installed, the test runs successfully, and coverage is reported as expected.
Recommended