Testing with Angular CLI

Overview

Testing is a crucial part of software development, particularly for Angular applications that need to be reliable and maintainable. Angular CLI provides built-in tools to facilitate unit testing and end-to-end testing.

Types of Testing

In Angular, the main types of testing include:

• Unit Testing: Testing individual components and services in isolation.
• Integration Testing: Testing the interaction between components.
• End-to-End Testing: Testing the entire application flow from start to finish.

Setup and Configuration

To set up testing in an Angular project, follow these steps:

1. Ensure you have Angular CLI installed:

   npm install -g @angular/cli

2. Create a new Angular project (if not created):

   ng new my-app

3. Navigate into your project:

   cd my-app

4. Install dependencies for testing:

   npm install --save-dev jasmine-core karma karma-chrome-launcher

5. Configure the karma.conf.js file if necessary.

Running Tests

To run tests in your Angular application, use the following commands:

• Run unit tests:

  ng test

• Run end-to-end tests:

  ng e2e

By default, Angular uses Karma as a test runner and Jasmine as the testing framework.

Best Practices

Here are some best practices for testing in Angular:

• Keep tests isolated and independent.
• Use spies to mock dependencies.
• Write descriptive test names.
• Run tests frequently during development.

FAQ

Flowchart: Testing Workflow

graph TD;
    A[Start] --> B{Test Type};
    B -->|Unit Test| C[Run ng test];
    B -->|E2E Test| D[Run ng e2e];
    C --> E[Check Results];
    D --> E;
    E --> F{Tests Pass?};
    F -->|Yes| G[Deploy Application];
    F -->|No| H[Fix Issues];
    H --> B;