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This post lists some subjective questions and answers related to Testing Angular Applications. This collection contains some potential interview questions that may be helpful if you are preparing for a Frontend Engineering job interview specific to Angular framework. Check out Angular Interview Series – Topic Wise Q&A.
1. What is the purpose of testing in Angular?
Testing ensures that Angular applications work as intended and helps in catching bugs early. Testing also helps in verifying functionality, and maintaining code quality throughout development.
2. What testing frameworks are commonly used with Angular?
Angular commonly uses Jasmine for writing tests and Karma as a test runner.
3. What is a unit test?
A unit test verifies the functionality of a specific section of code (usually a function) in isolation from the rest of the application.
4. What is an integration test?
An integration test checks how different components or services work together, ensuring that the integrated units function as expected.
5. How do you create a test for a component?
We can create a test for a component by using the TestBed utility to configure and create an instance of the component for testing.
6. What is the purpose of the TestBed?
TestBed is a testing utility that helps configure the testing module, set up dependencies, and create components or services for testing.
7. How do you run tests in an Angular application?
We can run tests using the Angular CLI command ng test, which will start Karma and execute the tests.
8. What is a spy in Jasmine?
A spy is a Jasmine feature that allows us to track calls to a function, enabling us to verify that a function was called or to simulate its behavior.
9. How do you test asynchronous code in Angular?
We can test asynchronous code using async and fakeAsync functions, along with tick() to control the passage of time in tests.
10. What is end-to-end (E2E) testing?
E2E testing verifies the entire application flow, simulating user interactions to ensure that all components work together as expected, often using tools like Protractor or Cypress.
These are just a few questions specific to Angular Components. To know more please refer to the Official documentation on Angular Testing.