src/app/shared/store/reducers/contacts/contacts.reducer.spec.ts

import {ContactsReducer, INITIAL_STATE, getData, getLoading, getLoaded, getFailed, reducer} from '@shared/store/reducers/contacts/contacts.reducer';
import * as contactsActions from '@shared/store/actions/contacts.action';
import { Contact } from '@shared/models';


describe('Contacts reducer', () => {

  it('should return the initial state', () => {
    const action = { type: 'NOOP' } as any;
    const result = reducer(undefined, action);

    expect(result).toBe(INITIAL_STATE);
  });

  it('should return initial state in case of missing action', () => {
    const result = reducer(undefined, null);
    expect(result).toBe(INITIAL_STATE);
  });

  it('should trigger loading state', () => {
    const action = contactsActions.loadContacts();
    const result = ContactsReducer(INITIAL_STATE, action);

    expect(result).toEqual({
      ...INITIAL_STATE,
      loading: true,
    });
  });

  it('should trigger loaded state', () => {
    const contacts: contactsActions.ILoadContactsSuccess = {payload: [new Contact()]};
    contacts.payload[0].name = 'testme';
    const action = contactsActions.loadContactsSuccess(contacts);
    const result = ContactsReducer(INITIAL_STATE, action);

    expect(result.loaded).toBe(true);
  });

  it('should trigger failed state', () => {
    const error: contactsActions.ILoadContactsFail = {payload: 'err_msg'};
    const action = contactsActions.loadContactsFail(error);
    const result = ContactsReducer(INITIAL_STATE, action);

    expect(result).toEqual({
      ...INITIAL_STATE,
      failed: true,
    });
  });

  it('getData return state.data', () => {
    const state = { ...INITIAL_STATE };
    const result = getData(state);
    expect(result).toBe(state.data);
  });

  it('getLoading return state.loading', () => {
    const state = { ...INITIAL_STATE };
    const result = getLoading(state);
    expect(result).toBe(state.loading);
  });

  it('getLoaded return state.loaded', () => {
    const state = { ...INITIAL_STATE };
    const result = getLoaded(state);
    expect(result).toBe(state.loaded);
  });

  it('getFailed return state.failed', () => {
    const state = { ...INITIAL_STATE };
    const result = getFailed(state);
    expect(result).toBe(state.failed);
  });

});