How do I test NGRX applications effectively?

How do I test NGRX applications effectively?

To test NGRX applications, you can use Jasmine and Karma for unit tests, and Protractor for end-to-end tests.

What are some best practices for writing tests in NGRX?

Best practices include keeping tests isolated, using mock stores, and testing selectors and effects separately.

Can you give me an example of a unit test for an NGRX reducer?

Sure! Here's a simple example:

import { reducer, initialState } from './my.reducer';
import { myAction } from './my.actions';

describe('My Reducer', () => {
  it('should return the initial state', () => {
    expect(reducer(undefined, {})).toEqual(initialState);
  });

  it('should handle MY_ACTION', () => {
    const action = myAction({ payload: 'new data' });
    const expectedState = { ...initialState, data: 'new data' };
    expect(reducer(initialState, action)).toEqual(expectedState);
  });
});

What tools do I need to set up for testing NGRX?

You will need Jasmine, Karma, and Protractor for testing. Additionally, you might want to use NgRx Store DevTools for debugging.