Template for testing selectors

selectors.template.js

import { fromJS } from 'immutable';
import {
  ...
} from '#src/containers/ContainersName/selectors';
import { initialState } from '#src/containers/ContainersName/reducer';

let mockReduxData;

jest.mock('reselect', () => ({
  createSelector: (fn, fn2) => {
    return fn2(mockReduxData);
  },
}));

describe('ContainerName selectors', () => {
  const testTable = [
    {
      name: 'selectorName should return true when the isVisible is true',
      selector: selectorName,
      data: {
        isVisible: true,
      },
      expected: true,
    },
  ];
  
  beforeEach(() => {
    mockReduxData = undefined;
  });

  testTable.forEach(({ name, data, expected, selector }) => {
    it(name, () => {
      mockReduxData = fromJS(data);
      expect(selector()).toEqual(expected);
    });
  });
});

describe('selectReducer', () => {
  const reducerName = 'reducerName';
  const mockReducers = {
    [reducerName]: initialState.toJS(),
  };

  test('select selectReducer data in the reducers', () => {
    const result = selectReducer()(fromJS(mockReducers));
    expect(result.toJS()).toEqual(mockReducers[reducerName]);
  });
});