How do I set up Jest for testing in an Angular application?

How do I set up Jest for testing in an Angular application?

To set up Jest in an Angular application, you need to install Jest and some related packages. You can start by running: npm install --save-dev jest jest-preset-angular.

What configuration do I need for Jest in Angular?

You need to create a jest.config.js file in your project root. Here's a basic configuration:

module.exports = {
  preset: 'jest-preset-angular',
  setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],
  testPathIgnorePatterns: ['/node_modules/', '/dist/'],
  transform: {
    '^.+\.(ts|js|html)$': 'ts-jest',
  },
};

What is the purpose of the setup-jest.ts file?

The setup-jest.ts file is used to configure the testing environment for Angular. It typically includes necessary imports and setups, like configuring the Angular testing module.

Can I run my tests using a specific command?

Yes! You can run your tests using the command: npm test. This will execute Jest and run all your test files.