InsidersByte/honeymoon-gift-list

import reducer, * as actions from './basket';

describe('basket', () => {
  describe('actions', () => {
    it('should create an action to add an item to the basket', () => {
      const item = { id: 1 };

      const expectedAction = {
        type: 'our-wedding-heroes/basket/ADD_TO_BASKET',
        payload: item,
      };

      expect(actions.addToBasket(item)).toEqual(expectedAction);
    });

    it('should create an action to remove an item from the basket', () => {
      const item = { id: 1 };

      const expectedAction = {
        type: 'our-wedding-heroes/basket/REMOVE_FROM_BASKET',
        payload: item,
      };

      expect(actions.removeFromBasket(item)).toEqual(expectedAction);
    });

    it('should create an action to delete an item from the basket', () => {
      const item = { id: 1 };

      const expectedAction = {
        type: 'our-wedding-heroes/basket/DELETE_FROM_BASKET',
        payload: item,
      };

      expect(actions.deleteFromBasket(item)).toEqual(expectedAction);
    });

    it('should create an action to empty the basket', () => {
      const expectedAction = {
        type: 'our-wedding-heroes/basket/EMPTY_BASKET',
      };

      expect(actions.emptyBasket()).toEqual(expectedAction);
    });
  });

  describe('selectors', () => {
    describe('getBasketCount', () => {
      it('should return the total count of the items in the basket', () => {
        let state = new Map();
        state.set(1, { id: 1, quantity: 9 });
        state.set(2, { id: 2, quantity: 3 });
        state.set(3, { id: 3, quantity: 3 });

        expect(actions.getBasketCount(state)).toBe(15);

        state = new Map();
        state.set(1, { id: 1, quantity: 5 });
        state.set(2, { id: 2, quantity: 4 });
        state.set(3, { id: 3, quantity: 1 });

        expect(actions.getBasketCount(state)).toBe(10);
      });
    });

    describe('getBasketTotal', () => {
      it('should return the total cost of the items in the basket', () => {
        let state = new Map();
        state.set(1, { id: 1, quantity: 9, price: 3 });
        state.set(2, { id: 2, quantity: 3, price: 5 });
        state.set(3, { id: 3, quantity: 2, price: 4 });

        expect(actions.getBasketTotal(state)).toBe(50);

        state = new Map();
        state.set(1, { id: 1, quantity: 9, price: 1 });
        state.set(2, { id: 2, quantity: 3, price: 3 });
        state.set(3, { id: 3, quantity: 2, price: 1 });

        expect(actions.getBasketTotal(state)).toBe(20);
      });
    });
  });

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

    it('should handle ADD_TO_BASKET', () => {
      const expectedState = new Map();
      expectedState.set(1, { id: 1, quantity: 1 });

      expect(reducer(new Map(), { type: 'our-wedding-heroes/basket/ADD_TO_BASKET', payload: { id: 1 } })).toEqual(expectedState);

      const initialState = new Map();
      initialState.set(1, { id: 1, quantity: 1 });

      expectedState.clear();
      expectedState.set(1, { id: 1, quantity: 2 });

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/ADD_TO_BASKET', payload: { id: 1 } })).toEqual(expectedState);

      initialState.clear();
      initialState.set(1, { id: 1, quantity: 1, remaining: 1 });

      expectedState.clear();
      expectedState.set(1, { id: 1, quantity: 1, remaining: 1 });

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/ADD_TO_BASKET', payload: { id: 1 } })).toEqual(expectedState);
    });

    it('should handle REMOVE_FROM_BASKET', () => {
      const initialState = new Map();
      initialState.set(1, { id: 1, quantity: 1 });

      const expectedState = new Map();
      expectedState.set(1, { id: 1, quantity: 1 });

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/REMOVE_FROM_BASKET', payload: { id: 1 } })).toEqual(expectedState);

      initialState.clear();
      initialState.set(1, { id: 1, quantity: 2 });

      expectedState.clear();
      expectedState.set(1, { id: 1, quantity: 1 });

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/REMOVE_FROM_BASKET', payload: { id: 1 } })).toEqual(expectedState);

      initialState.clear();

      expect(() => reducer(initialState, { type: 'our-wedding-heroes/basket/REMOVE_FROM_BASKET', payload: { id: 1 } })).toThrowError(
        "Cannot find item with id: '1'"
      );
    });

    it('should handle DELETE_FROM_BASKET', () => {
      const initialState = new Map();
      initialState.set(1, { id: 1, quantity: 1 });

      const expectedState = new Map();

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/DELETE_FROM_BASKET', payload: { id: 1 } })).toEqual(expectedState);

      initialState.clear();
      expectedState.clear();

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/DELETE_FROM_BASKET', payload: { id: 1 } })).toEqual(expectedState);
    });

    it('should handle EMPTY_BASKET', () => {
      const initialState = new Map();
      initialState.set(1, { id: 1, quantity: 1 });

      const expectedState = new Map();

      expect(reducer(initialState, { type: 'our-wedding-heroes/basket/EMPTY_BASKET', payload: { id: 1 } })).toEqual(expectedState);
    });
  });
});