How can I mock dependencies in TypeScript with Express?

How can I mock dependencies in TypeScript with Express?

You can use libraries like Jest or Sinon to mock dependencies in your TypeScript Express application. Would you like an example?

Yes, please provide an example using Jest.

Sure! First, install Jest and its types: npm install --save-dev jest @types/jest ts-jest. Then, you can create a mock for your service.

How do I set up the test file for this?

Create a test file, e.g., app.test.ts, and use jest.mock() to mock your dependencies. Here's a simple setup example.

What if I want to test an API endpoint?

You can use Supertest along with Jest to test your API endpoints. Would you like a code snippet for that?