Coverage

Coverage measures the extent of test execution. Key points:

Types:

• Statement coverage
• Branch coverage
• Path coverage
• Function coverage

Calculation:

• (Executed items / Total items) * 100

Tools:

• JaCoCo
• Istanbul
• Cobertura

Benefits:

• Identifies untested code
• Guides test case development
• Measures testing thoroughness

Limitations:

• High coverage doesn’t guarantee quality
• Some code may be intentionally uncovered

Coverage metrics help assess and improve testing effectiveness.