Reliability Testing
Reliability Testing is the process of evaluating whether a software application performs consistently and correctly over a period of time under normal usage conditions, without unexpected failures.
Reliability testing answers: “Does the system work consistently over time?”
1. Definition
Reliability Testing is the process of evaluating whether a software application performs consistently and correctly over a period of time under normal usage conditions, without unexpected failures.
Reliability testing answers: “Does the system work consistently over time?”
2. Purpose of Reliability Testing
- Ensure system stability
- Detect intermittent failures
- Validate error recovery behavior
- Increase user trust and confidence
3. Manual Tester’s Scope
Manual testers focus on:
- Repeated execution of key workflows
- Long-running session behavior
- Stability after continuous usage
- Error recovery handling
4. Reliability vs Performance Testing
| Aspect | Reliability Testing | Performance Testing |
|---|---|---|
| Focus | Stability over time | Speed under load |
| Time | Long-term | Short-term |
| Failure | Crashes, hangs | Slowness, timeouts |
5. Key Reliability Factors
- Consistent functionality
- No memory leaks (conceptual)
- Proper session handling
- Graceful error recovery
6. Real-Time Example
An application:
- Works fine initially
- Crashes after hours of usage
Reliability testing identifies such long-term stability issues.
7. Entry & Exit Criteria
Entry Criteria
- Stable build available
- Key workflows identified
Exit Criteria
- No critical stability issues
- Known reliability risks documented
8. Common Reliability Defects
- Application crashes
- Session drops
- Data inconsistency over time
- Unhandled exceptions
9. Common Mistakes
- Testing only short scenarios
- Ignoring intermittent issues
- Assuming stability after one test
10. Interview-Ready Answers
Short answer:
Reliability testing verifies that a system performs consistently and reliably over time.
Detailed answer:
Reliability testing ensures the application remains stable and functions correctly during prolonged and repeated usage.
11. Key Takeaway
Reliability Testing ensures the software is stable, dependable, and trustworthy over time.