Regression Management

Purpose

Maintain effective regression test suites that catch regressions efficiently while minimizing execution time and maintenance burden.

When to Use

• Suite maintenance
• After feature completion
• Performance optimization
• Suite health review

Prerequisites

• Test inventory exists
• Execution history available
• Prioritization criteria defined

Process

Step 1: Assess Current Suite

Suite assessment:
- Total test count
- Execution time
- Pass rate history
- Flaky test rate
- Coverage overlap

Step 2: Identify Optimization Opportunities

Optimization areas:
- Remove redundant tests
- Fix flaky tests
- Consolidate similar tests
- Parallelize execution
- Improve data setup

Step 3: Manage Suite Growth

Addition criteria:
- Bug fix → regression test
- New feature → suite inclusion
- Critical path → P0 suite

Removal criteria:
- Feature removed
- Redundant coverage
- Consistently passing (risk-based)

Step 4: Organize Suite Structure

Suite organization:
- By feature/module
- By priority level
- By execution time
- By dependency

Step 5: Monitor Suite Health

Health metrics:
- Execution time trend
- Flaky test rate
- Failure patterns
- Maintenance effort

Inputs

Input	Type	Required	Description
test_inventory	JSON	Yes	All tests
execution_history	JSON	Yes	Past results
feature_map	JSON	Yes	Feature to test mapping

Outputs

Output	Type	Description
regression_suite.json	JSON	Curated suite
suite_health.md	Markdown	Health report
optimization_plan.md	Markdown	Improvement plan

StudyAbroad-Specific Considerations

• OAuth regression tests essential
• Document upload regressions
• Application workflow regressions
• GDPR regression mandatory

Integration Points

• Developer Agent: Regression additions
• DevOps Agent: Suite execution
• Orchestrator: Gate validation

Examples

Regression Suite Management - StudyAbroad-v1

CURRENT SUITE STATUS:

Suite Overview:
| Suite | Tests | Time | Pass Rate |
|-------|-------|------|-----------|
| Smoke | 15 | 5 min | 100% |
| Core Regression | 85 | 25 min | 98.5% |
| Full Regression | 180 | 55 min | 97.2% |
| Nightly | 252 | 90 min | 96.8% |

Health Metrics:
- Flaky Tests: 5 (2.0%)
- Redundant Tests: 8 (estimated)
- Avg Maintenance: 4 hrs/sprint
- Test Growth: +12 tests/sprint

FLAKY TESTS:

| Test ID | Module | Flake Rate | Cause | Action |
|---------|--------|------------|-------|--------|
| TC-E2E-003 | App | 15% | Timing | Fix wait |
| TC-INT-022 | API | 10% | DB state | Isolate data |
| TC-E2E-008 | Upload | 8% | Network | Mock network |
| TC-UNIT-145 | Async | 5% | Race | Fix async |
| TC-E2E-012 | Search | 5% | Index | Wait for index |

Action Plan:
1. TC-E2E-003: Add explicit wait - Sprint 7
2. TC-INT-022: Transaction isolation - Sprint 7
3. Others: Batch fix in Sprint 8

REDUNDANCY ANALYSIS:

Potentially Redundant:
| Tests | Coverage | Recommendation |
|-------|----------|----------------|
| TC-003-001, TC-003-002 | Same path | Merge into 1 |
| TC-005-002, TC-005-005 | Similar boundary | Keep both |
| TC-UNIT-050-055 | Overlapping | Remove 3 |

Action: Review and merge 5 tests → Save 3 min

SUITE OPTIMIZATION PLAN:

Current: 55 min (full regression)
Target: 40 min

Optimizations:
1. Fix flaky tests: -5 min (no reruns)
2. Remove redundant: -3 min
3. Parallelize E2E: -10 min
4. Optimize data setup: -5 min
Projected: 32 min ✓

REGRESSION ADDITION QUEUE:

New Tests Pending Addition:
| Test | Feature | Priority | Sprint |
|------|---------|----------|--------|
| TC-SCAN-001 | Virus scan | P1 | 7 |
| TC-SCAN-002 | Scan timeout | P1 | 7 |
| TC-NOTIF-010 | Email retry | P2 | 7 |

Bug Fix Regressions:
| Bug | Test | Suite |
|-----|------|-------|
| BUG-034 | TC-REG-034 | Core |
| BUG-042 | TC-REG-042 | Core |

SUITE STRUCTURE:

regression/ ├── smoke/ # 5 min, always run │ ├── auth.smoke.ts │ ├── application.smoke.ts │ └── search.smoke.ts ├── core/ # 25 min, every merge │ ├── auth/ │ ├── user/ │ ├── application/ │ ├── document/ │ └── gdpr/ ├── extended/ # 30 min, nightly │ ├── university/ │ ├── notifications/ │ └── integrations/ └── e2e/ # 20 min, parallel ├── user-journey/ ├── admin-journey/ └── error-flows/

MAINTENANCE SCHEDULE:

Weekly:
- Review flaky test alerts
- Triage new failures

Sprint End:
- Add feature regression tests
- Add bug fix regressions
- Review redundancy

Quarterly:
- Full suite review
- Performance optimization
- Archive obsolete tests

Validation

• Suite execution time acceptable
• Flaky rate < 5%
• No redundant tests
• All critical paths covered
• Maintenance sustainable