Angular Interview Practice

How can you run unit tests in an Angular project?

1. ng test

2. npm run test

3. ng unit

4. npm test run

The correct answer is: ng test

The correct way to run unit tests in an Angular project is by using the Angular CLI command "ng test". This command leverages the Angular testing framework, typically Jasmine, to execute the tests defined in the project. When you run "ng test", it automatically compiles the application in test mode and launches Karma, which is a test runner that facilitates running the tests in the browser. This command also initiates a watch mode by default, meaning that it will continuously monitor your files for changes and rerun tests as you develop, providing instant feedback. The other options, while they refer to methods of executing tests, do not specifically utilize the Angular CLI or the framework's conventions. For example, "npm run test" may also run tests if defined appropriately in the package.json file but doesn't explicitly link to the Angular CLI's orchestration of unit testing. Other options either represent non-existing commands in Angular or imply a different context that does not directly correspond to Angular's standardized testing process. Thus, understanding and utilizing "ng test" is fundamental for efficiently running unit tests in Angular applications.