Belajar Quality Engineer - Quality Strategy & Test Pyramid

#Pendahuluan

Setelah di episode 1 kita memahami peran QE dan evolusi QA → QE, pada episode ini kita mempelajari quality strategy & test pyramid — bagaimana merancang strategi kualitas yang efektif. Quality strategy adalah fondasi dari semua aktivitas quality engineering.

Mengapa quality strategy penting? Karena tanpa strategi yang jelas, upaya quality akan terfragmentasi dan tidak efektif. Dengan test pyramid yang benar, kalian bisa mengalokasikan resources secara optimal dan memaksimalkan ROI testing.

#Test Pyramid

#Konsep Test Pyramid

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Test Pyramid:
├── Top: E2E Tests (sedikit, lambat, mahal)
│   └── User flows end-to-end
├── Middle: Integration Tests (sedang)
│   └── API & service integration
└── Bottom: Unit Tests (banyak, cepat, murah)
    └── Function & component tests

#Perbandingan

Level	Jumlah	Speed	Cost	Reliability
Unit	Banyak (70%)	Sangat cepat	Murah	Tinggi
Integration	Sedang (20%)	Cepat	Sedang	Sedang
E2E	Sedikit (10%)	Lambat	Mahal	Rendah

#Anti-Patterns

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Anti-Patterns:
├── Ice Cream Cone:
│   ├── Top-heavy (banyak E2E)
│   ├── Sedikit unit test
│   └── Lambat & mahal
├── Hourglass:
│   ├── Banyak unit test
│   ├── Sedikit integration
│   └── Test tidak realistis
└── Missing Layers:
    ├── Satu layer hilang
    └── Coverage gap

Note

Test pyramid bukan aturan kaku. Proporsi bisa bervariasi tergantung aplikasi. Yang penting adalah memahami trade-off setiap level dan mengalokasikan resources secara optimal.

#Risk-Based Testing

#Identifikasi Risiko

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Risk Assessment:
├── High Risk:
│   ├── Core business logic
│   ├── Payment processing
│   ├── Security-sensitive areas
│   └── Frequently changing code
├── Medium Risk:
│   ├── Secondary features
│   ├── User management
│   └── Reporting
└── Low Risk:
    ├── Static content
    ├── About page
    └── Internal tools

#Risk Mitigation

text

Risk Mitigation Strategies:
├── High Risk:
│   ├── Full test coverage
│   ├── Multiple test types
│   ├── Performance testing
│   └── Security testing
├── Medium Risk:
│   ├── Moderate test coverage
│   ├── Regression testing
│   └── Smoke testing
└── Low Risk:
    ├── Basic smoke testing
    └── Manual verification

#Quality Gates

#Definisi Quality Gates

text

Quality Gates:
├── Gate 1: Code Quality
│   ├── Linting passes
│   ├── Code review approved
│   └── No critical issues
├── Gate 2: Test Quality
│   ├── Unit test coverage > 80%
│   ├── All tests pass
│   └── No flaky tests
├── Gate 3: Integration
│   ├── API tests pass
│   ├── Integration tests pass
│   └── No breaking changes
├── Gate 4: Security
│   ├── No high/critical vulnerabilities
│   └── OWASP scan clean
├── Gate 5: Performance
│   ├── Response time < threshold
│   └── No performance regression
└── Gate 6: Release
    ├── All gates passed
    ├── Product owner approval
    └── QA sign-off

#Practical: Quality Strategy Document

yaml

quality_strategy:
  title: "Quality Strategy - E-Commerce App"
  objectives:
    - Ensure 99.9% uptime
    - Maintain defect rate < 0.1%
    - Achieve 90% test coverage
  test_pyramid:
    unit: "70% coverage"
    integration: "20% coverage"
    e2e: "Critical paths only"
  quality_gates:
    - gate_1_code_quality
    - gate_2_test_quality
    - gate_3_integration
    - gate_4_security
    - gate_5_performance
  risk_areas:
    - payment: "High risk - full testing"
    - user_management: "Medium risk - regression"
    - content: "Low risk - smoke testing"

Tip

Quality strategy harus disesuaikan dengan konteks aplikasi. E-commerce butuh payment testing, healthcare butuh compliance testing, SaaS butuh multi-tenancy testing. Sesuaikan strategy dengan domain.

#Penutup

Pada episode 2 ini, kalian telah mempelajari quality strategy & test pyramid.

Inti yang harus dibawa pulang:

Test pyramid: unit (70%) → integration (20%) → E2E (10%).
Risk-based testing: alokasikan resources berdasarkan risiko.
Quality gates: checkpoint otomatis di setiap stage.
Quality strategy harus kontekstual dan evolve.

Di episode 3 selanjutnya, kita akan membahas test automation mastery — bagaimana membangun framework automation yang maintainable dan scalable. Sampai jumpa di episode 3!