Statement coverage, also known as line coverage, is a fundamental metric in white-box testing. It ensures that every executable statement in the code has been tested at least once. This blog will dive into what statement coverage is, why it’s important, and how to measure and improve it.
What is Statement Coverage?
Statement coverage measures the percentage of executable code lines that are executed by a test suite. The formula is:
Statement Coverage = (Executed Statements / Total Statements) * 100
Why is it Important?
- Ensures all code is tested
- Helps identify dead code
- Improves software quality
How to Measure Statement Coverage
Tools like:
- Coverage.py (Python)
- JaCoCo (Java)
- Istanbul (JavaScript)
Example in Python
def add(a, b):
return a + b
def subtract(a, b):
return a - b
If only add() is tested, the coverage is 50%.
Limitations
- Doesn’t guarantee path coverage
- Doesn’t catch logical errors
How to Improve
- Write more tests
- Use test coverage tools
- Refactor untestable code
Conclusion
Statement coverage is essential but not sufficient on its own. Combine it with other techniques like branch and path coverage for better results.
Read more https://keploy.io/blog/community/understanding-statement-coverage-in-software-testing