Integration & Contract Testing

Focused patterns for testing API boundaries, cross-service contracts, component integration, database layers, property-based verification, and schema validation.

Quick Reference

Area	Rule / Reference	Impact
API endpoint tests	rules/integration-api.md	HIGH
React component integration	rules/integration-component.md	HIGH
Database layer testing	rules/integration-database.md	HIGH
Zod schema validation	rules/validation-zod-schema.md	HIGH
Pact contract testing	rules/verification-contract.md	MEDIUM
Stateful testing (Hypothesis)	rules/verification-stateful.md	MEDIUM
Evidence & property-based	rules/verification-techniques.md	MEDIUM

References

Topic	File
Consumer-side Pact tests	references/consumer-tests.md
Pact Broker CI/CD	references/pact-broker.md
Provider verification setup	references/provider-verification.md
Hypothesis strategies guide	references/strategies-guide.md

Checklists

Checklist	File
Contract testing readiness	checklists/contract-testing-checklist.md
Property-based testing	checklists/property-testing-checklist.md

Scripts & Templates

Script	File
Create integration test	scripts/create-integration-test.md
Test plan template	scripts/test-plan-template.md

Examples

Example	File
Full testing strategy	examples/orchestkit-test-strategy.md

---

Quick Start: API Integration Test

TypeScript (Supertest)

import request from 'supertest';
import { app } from '../app';

describe('POST /api/users', () => {
  test('creates user and returns 201', async () => {
    const response = await request(app)
      .post('/api/users')
      .send({ email: 'test@example.com', name: 'Test' });

    expect(response.status).toBe(201);
    expect(response.body.id).toBeDefined();
    expect(response.body.email).toBe('test@example.com');
  });

  test('returns 400 for invalid email', async () => {
    const response = await request(app)
      .post('/api/users')
      .send({ email: 'invalid', name: 'Test' });

    expect(response.status).toBe(400);
    expect(response.body.error).toContain('email');
  });
});

Python (FastAPI + httpx)

import pytest
from httpx import AsyncClient
from app.main import app

@pytest.fixture
async def client():
    async with AsyncClient(app=app, base_url="http://test") as ac:
        yield ac

@pytest.mark.asyncio
async def test_create_user(client: AsyncClient):
    response = await client.post(
        "/api/users",
        json={"email": "test@example.com", "name": "Test"}
    )
    assert response.status_code == 201
    assert response.json()["email"] == "test@example.com"

---

Coverage Targets

Area	Target
API endpoints	70%+
Service layer	80%+
Component interactions	70%+
Contract tests	All consumer-used endpoints
Property tests	All encode/decode, idempotent functions

---

Key Principles

1. Test at boundaries -- API inputs, database queries, service calls, external integrations
2. Fresh state per test -- In-memory databases, transaction rollback, no shared mutable state
3. Use matchers in contracts -- Like(), EachLike(), Term() instead of exact values
4. Property-based for invariants -- Roundtrip, idempotence, commutativity properties
5. Validate schemas at edges -- Zod .safeParse() at every API boundary
6. Evidence-backed completion -- Exit code 0, coverage reports, timestamps

---

When to Use This Skill

• Writing API endpoint tests (Supertest, httpx)
• Setting up React component integration tests with providers
• Creating database integration tests with isolation
• Implementing Pact consumer/provider contract tests
• Adding property-based tests with Hypothesis
• Validating Zod schemas at API boundaries
• Planning a testing strategy for a new feature or service

Related Skills

• ork:testing-unit — Unit testing patterns, fixtures, mocking
• ork:testing-e2e — End-to-end Playwright tests
• ork:database-patterns — Database schema and migration patterns
• ork:api-design — API design patterns for endpoint testing