How do I test pipes in Angular?

How do I test pipes in Angular?

To test pipes in Angular, you can use the TestBed utility to create a testing module and then instantiate the pipe.

Can you show me a code example for testing a pipe?

Sure! Here's a simple example:

import { TestBed } from '@angular/core/testing';
import { MyPipe } from './my-pipe';

describe('MyPipe', () => {
  let pipe: MyPipe;

  beforeEach(() => {
    TestBed.configureTestingModule({});
    pipe = new MyPipe();
  });

  it('should transform input correctly', () => {
    expect(pipe.transform('input')).toBe('expectedOutput');
  });
});

What are some common mistakes when testing pipes?

Common mistakes include not providing the necessary dependencies in the testing module or forgetting to handle edge cases in the pipe's logic.

How can I test async pipes?

To test async pipes, you can use the fakeAsync and tick functions from Angular's testing utilities to simulate asynchronous behavior.