Template for testing reducer

reducer.template.js

import ReducerName, {
  initialState,
} from '#src/containers/ContainerName/reducer';
import {
  ...
} from '#src/containers/ContainerName/constants';

describe('ReducerName reducer', () => {
  const initialStateJS = initialState.toJS();

  const testTable = [
    {
      title: 'it should return initial state',
      action: { type: undefined },
      expected: initialStateJS,
    },
  ];

  testTable.forEach(({ title, action, expected }) => {
    it(`${title}`, () => {
      expect(ReducerName(initialState, action).toJS()).toEqual(
        expected
      );
    });
  });
});