API Test Generator

When to activate

• Generating test suites from OpenAPI specifications
• Creating contract tests to validate API responses against schemas
• Building integration tests for endpoint workflows
• Setting up load tests for performance benchmarks
• Automating regression tests for API changes

When NOT to use

• For unit testing business logic (use language-specific test tools)
• For E2E frontend testing
• For database migration testing

Instructions

1. Parse OpenAPI spec. Extract all paths, methods, request bodies, response schemas, and auth requirements.
2. Generate contract tests. For each endpoint, validate response status codes, headers, and JSON schema conformance.
3. Build integration tests. Chain related endpoints (create → read → update → delete) with data assertions.
4. Create edge case tests. Missing fields, invalid types, boundary values, unauthorized access, rate limit triggers.
5. Set up test fixtures. Seed data, auth tokens, and environment configs for test isolation.
6. Generate load tests. k6 or Artillery scripts targeting critical endpoints with ramp-up scenarios.
7. Output test report. Pass/fail summary, coverage %, uncovered endpoints, and performance metrics.

Example

// Contract test — GET /users/{id}
describe('GET /users/{id}', () => {
  it('returns 200 with valid user schema', async () => {
    const res = await request.get('/users/123', { headers: authHeader });
    expect(res.status).toBe(200);
    expect(res.body).toMatchSchema(userSchema);
    expect(res.headers['content-type']).toContain('application/json');
  });

  it('returns 404 for non-existent user', async () => {
    const res = await request.get('/users/000000', { headers: authHeader });
    expect(res.status).toBe(404);
    expect(res.body.error.code).toBe('USER_NOT_FOUND');
  });
});