What criteria help determine the effectiveness and reliability of automated tests?

The effectiveness and reliability of automated tests are evaluated based on several key criteria:

• Code Coverage: how much of the code is tested. High coverage reduces the likelihood of missing errors.
• Repeatability: tests should give the same result when run multiple times under the same conditions.
• Isolation: tests should not depend on each other or external factors (such as networks or databases) to avoid false positives.
• Speed: tests should run quickly so they can be executed frequently.
• Maintainability: tests should be understandable and easily updatable when the functionality changes.
• Reliability: minimal false positives/negatives to avoid wasting time on non-existent errors.
• Automation: integration with CI/CD for automatic test execution upon code changes.

For example, if tests cover all critical scenarios, run quickly, and pass consistently without false errors, they can be considered effective and reliable.