🔗 Integration & Regression Testing
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# 🔗 Integration & Regression Testing ## 1. 🎯 Learning Objectives - Apply integration strategies: top-down, bottom-up, sandwich - Perform impact analysis for regression testing - Select test cases for regression suites ## 2.
🔗 Integration & Regression Testing
1. 🎯 Learning Objectives
- Apply integration strategies: top-down, bottom-up, sandwich
- Perform impact analysis for regression testing
- Select test cases for regression suites
2. 📖 Core Content
3.1 Integration Testing Strategies
| Strategy | Order | Stubs/Drivers | Pros | Cons |
|---|---|---|---|---|
| Top-down | Highest module first | Stubs (lower level simulated) | Early architecture validation | Needs many stubs |
| Bottom-up | Lowest module first | Drivers (higher level simulated) | Early bottom functionality | Late architecture validation |
| Sandwich | Both directions | Both | Balanced | Complex coordination |
3.2 Regression Testing
After code changes, verify existing functionality still works.
Test selection strategies:
- Retest-all: Run all tests (complete but expensive)
- Impact analysis: Select tests affected by code changes
- Risk-based: Prioritize high-risk areas
4. 📝 Practice Questions
Q1: In top-down integration, what are stubs and why are they needed?Answer: Stubs are simplified versions of lower-level modules that return predefined values. They're needed because lower-level modules haven't been integrated yet. The stub simulates their behavior so the higher-level module can be tested. Join Discord PreviousTest AutomationNextTest Case Design