What are the basics of testing in TypeScript?

What are the basics of testing in TypeScript?

Testing in TypeScript involves writing tests to ensure your code behaves as expected. You can use frameworks like Jest or Mocha.

How do I set up Jest for a TypeScript project?

To set up Jest, install it along with the TypeScript types: npm install --save-dev jest @types/jest ts-jest. Then, configure Jest in your package.json or create a jest.config.js file.

Can you show me a simple test example?

Sure! Here's a simple test for a function:

function add(a: number, b: number): number {
    return a + b;
}

test('adds 1 + 2 to equal 3', () => {
    expect(add(1, 2)).toBe(3);
});

What about testing asynchronous code?

For asynchronous code, you can use async/await in your tests. Just make sure to return the promise or use await.