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+# Regression Testing Guide
+
+Comprehensive guide to regression testing strategies and execution.
+
+---
+
+## What is Regression Testing?
+
+**Definition:** Re-testing existing functionality to ensure new changes haven't broken anything.
+
+**When to run:**
+- Before every release
+- After bug fixes
+- After new features
+- After refactoring
+- Weekly/nightly builds
+
+---
+
+## Regression Test Suite Structure
+
+### 1. Smoke Test Suite (15-30 min)
+
+**Purpose:** Quick sanity check
+
+**When:** Daily, before detailed testing
+
+**Coverage:**
+- Critical user paths
+- Core functionality
+- System health checks
+- Build stability
+
+**Example Smoke Suite:**
+```
+SMOKE-001: User can login
+SMOKE-002: User can navigate to main features
+SMOKE-003: Critical API endpoints respond
+SMOKE-004: Database connectivity works
+SMOKE-005: User can complete primary action
+SMOKE-006: User can logout
+```
+
+### 2. Full Regression Suite (2-4 hours)
+
+**Purpose:** Comprehensive validation
+
+**When:** Before releases, weekly
+
+**Coverage:**
+- All functional test cases
+- Integration scenarios
+- UI validation
+- Data integrity
+- Security checks
+
+### 3. Targeted Regression (30-60 min)
+
+**Purpose:** Test impacted areas
+
+**When:** After specific changes
+
+**Coverage:**
+- Modified feature area
+- Related components
+- Integration points
+- Dependent functionality
+
+---
+
+## Building a Regression Suite
+
+### Step 1: Identify Critical Paths
+
+**Questions:**
+- What can users absolutely NOT live without?
+- What generates revenue?
+- What handles sensitive data?
+- What's used most frequently?
+
+**Example Critical Paths:**
+- User authentication
+- Payment processing
+- Data submission
+- Report generation
+- Core business logic
+
+### Step 2: Prioritize Test Cases
+
+**P0 (Must Run):**
+- Business-critical functionality
+- Security-related tests
+- Data integrity checks
+- Revenue-impacting features
+
+**P1 (Should Run):**
+- Major features
+- Common user flows
+- Integration points
+- Performance checks
+
+**P2 (Nice to Run):**
+- Minor features
+- Edge cases
+- UI polish
+- Optional functionality
+
+### Step 3: Group by Feature Area
+
+```
+Authentication & Authorization
+├─ Login/Logout
+├─ Password reset
+├─ Session management
+└─ Permissions
+
+Payment Processing
+├─ Checkout flow
+├─ Payment methods
+├─ Refunds
+└─ Receipt generation
+
+User Management
+├─ Profile updates
+├─ Preferences
+├─ Account settings
+└─ Data export
+```
+
+---
+
+## Regression Suite Examples
+
+### E-commerce Regression Suite
+
+**Smoke Tests (20 min):**
+1. Homepage loads
+2. User can login
+3. Product search works
+4. Add to cart functions
+5. Checkout accessible
+6. Payment gateway responds
+
+**Full Regression (3 hours):**
+
+**User Account (30 min):**
+- Registration
+- Login/Logout
+- Password reset
+- Profile updates
+- Address management
+
+**Product Catalog (45 min):**
+- Browse categories
+- Search functionality
+- Filters and sorting
+- Product details
+- Image zoom
+- Reviews display
+
+**Shopping Cart (30 min):**
+- Add items
+- Update quantities
+- Remove items
+- Apply discounts
+- Save for later
+- Cart persistence
+
+**Checkout & Payment (45 min):**
+- Guest checkout
+- Registered user checkout
+- Multiple addresses
+- Payment methods
+- Order confirmation
+- Email notifications
+
+**Order Management (30 min):**
+- Order history
+- Order tracking
+- Cancellations
+- Returns/Refunds
+- Reorders
+
+---
+
+## Execution Strategy
+
+### Test Execution Order
+
+**1. Smoke first**
+- If smoke fails → stop, fix build
+- If smoke passes → proceed to full regression
+
+**2. P0 tests next**
+- Critical functionality
+- Must pass before proceeding
+
+**3. P1 then P2**
+- Complete remaining tests
+- Track failures
+
+**4. Exploratory**
+- Unscripted testing
+- Find unexpected issues
+
+### Pass/Fail Criteria
+
+**PASS:**
+- All P0 tests pass
+- 90%+ P1 tests pass
+- No critical bugs open
+- Performance acceptable
+
+**FAIL (Block Release):**
+- Any P0 test fails
+- Critical bug discovered
+- Security vulnerability
+- Data loss scenario
+
+**CONDITIONAL PASS:**
+- P1 failures with workarounds
+- Known issues documented
+- Fix plan in place
+
+---
+
+## Regression Test Management
+
+### Test Suite Maintenance
+
+**Monthly Review:**
+- Remove obsolete tests
+- Update changed functionality
+- Add new critical paths
+- Optimize slow tests
+
+**After Each Release:**
+- Update test data
+- Fix broken tests
+- Add regression for bugs found
+- Document changes
+
+### Automation Considerations
+
+**Good Candidates for Automation:**
+- Stable, repetitive tests
+- Smoke tests
+- API tests
+- Data validation
+- Cross-browser checks
+
+**Keep Manual:**
+- Exploratory testing
+- Usability evaluation
+- Visual design validation
+- Complex user scenarios
+
+---
+
+## Regression Test Execution Report
+
+```markdown
+# Regression Test Report: Release 2.5.0
+
+**Date:** 2024-01-15
+**Build:** v2.5.0-rc1
+**Tester:** QA Team
+**Environment:** Staging
+
+## Summary
+
+| Suite | Total | Pass | Fail | Blocked | Pass Rate |
+|-------|-------|------|------|---------|-----------|
+| Smoke | 10 | 10 | 0 | 0 | 100% |
+| P0 Critical | 25 | 23 | 2 | 0 | 92% |
+| P1 High | 50 | 47 | 2 | 1 | 94% |
+| P2 Medium | 40 | 38 | 1 | 1 | 95% |
+| **TOTAL** | **125** | **118** | **5** | **2** | **94%** |
+
+## Critical Failures (P0)
+
+### BUG-234: Payment processing fails for Visa
+- **Test:** TC-PAY-001
+- **Impact:** High - Blocks 40% of transactions
+- **Status:** In Progress
+- **ETA:** 2024-01-16
+
+### BUG-235: User session expires prematurely
+- **Test:** TC-AUTH-045
+- **Impact:** Medium - Users logged out unexpectedly
+- **Status:** Under investigation
+
+## Recommendation
+
+**Status:** ⚠️ CONDITIONAL GO
+- Fix BUG-234 (payment) before release
+- BUG-235 acceptable with documented workaround
+- Retest after fixes
+- Final regression run before production deployment
+
+## Risks
+
+- Payment issue could impact revenue
+- Session bug may frustrate users
+- Limited time before release deadline
+
+## Next Steps
+
+1. Fix BUG-234 by EOD
+2. Retest payment flow
+3. Document session workaround
+4. Final smoke test before release
+```
+
+---
+
+## Common Pitfalls
+
+**❌ Don't:**
+- Run same tests without updating
+- Skip regression "to save time"
+- Ignore failures in low-priority tests
+- Test only happy paths
+- Forget to update test data
+- Run regression once and forget
+
+**✅ Do:**
+- Maintain suite regularly
+- Run regression consistently
+- Investigate all failures
+- Include edge cases
+- Keep test data fresh
+- Automate repetitive tests
+
+---
+
+## Regression Checklist
+
+**Before Execution:**
+- [ ] Test environment ready
+- [ ] Build deployed
+- [ ] Test data prepared
+- [ ] Previous bugs verified fixed
+- [ ] Test suite reviewed/updated
+
+**During Execution:**
+- [ ] Follow test execution order
+- [ ] Document all failures
+- [ ] Screenshot/record issues
+- [ ] Note unexpected behavior
+- [ ] Track blockers
+
+**After Execution:**
+- [ ] Compile results
+- [ ] File new bugs
+- [ ] Update test cases
+- [ ] Report to stakeholders
+- [ ] Archive artifacts
+
+---
+
+## Quick Reference
+
+| Suite Type | Duration | Frequency | Coverage |
+|------------|----------|-----------|----------|
+| Smoke | 15-30 min | Daily | Critical paths |
+| Targeted | 30-60 min | Per change | Affected areas |
+| Full | 2-4 hours | Weekly/Release | Comprehensive |
+| Sanity | 10-15 min | After hotfix | Quick validation |
+
+**Remember:** Regression testing is insurance against breaking existing functionality.