recreating-redux-5-test.js

describe('combineReducers', () => {
  it('should combine multiple reducers to a single reducer', () => {
    const notes = (state = [ 'hello world' ], action) => {
      switch(action.type) {
        case 'ADD_NOTE':
          return [ ...state, action.payload ];
        default:
          return state;
      }
    };

    const numbers = (state = [ 1 ], action) => {
      switch(action.type) {
        case 'ADD_NUMBER':
          return [ ...state, action.payload ];
        default:
          return state;
      }
    };

    const reducer = combineReducers({ notes, numbers });

    const state = reducer({}, { type: 'ADD_NUMBER', payload: 2 });

    expect(state).to.deep.equal({
      notes: [ 'hello world' ],
      numbers: [ 1, 2 ]
    });
  });
});