Automated Testing for FileMaker API Integrations

Beginner

Write integration tests, contract tests, and mock servers for FileMaker Data API clients using Jest and tools like MSW.

What you'll learn

How to mock the FM Data API with MSW (Mock Service Worker)
How to write integration tests against a real test database
How to write contract tests that catch API shape changes
How to structure test fixtures for FileMaker responses

Testing against a live FileMaker server is slow, brittle, and requires network access. A good test strategy uses mock servers for fast unit tests, integration tests against a dedicated test database, and contract tests that verify your assumptions about the API response shape remain valid after FM version upgrades.

1/4

Setting up MSW for FM API mocking

MSW intercepts fetch calls at the network layer and returns mock responses. Define handlers that match FM API URL patterns and return realistic response fixtures.

FileMaker Script

// src/__tests__/mocks/fm-handlers.ts
import { http, HttpResponse } from 'msw';

export const fmHandlers = [
  http.post('*/fmi/data/v1/databases/*/sessions', () =>
    HttpResponse.json({ response: { token: 'mock-token-123' }, messages: [{ code: '0' }] })
  ),
  http.post('*/fmi/data/v1/databases/*/_find', () =>
    HttpResponse.json({
      response: {
        data: [
          { recordId: '1', modId: '2', fieldData: { Name: 'Alice', Status: 'Active' }, portalData: {} }
        ],
        dataInfo: { foundCount: 1, returnedCount: 1, database: 'CRM', layout: 'Contacts', table: 'Contacts' }
      },
      messages: [{ code: '0', message: 'OK' }]
    })
  ),
];

Async and Long-Running Operations via the Data API Documenting FileMaker API Integrations