import { ADD_TO_CART, REMOVE_FROM_CART } from "./actionTypes";
import rootReducer from './rootReducer';

let action;
let state;

it("is a function", function () {
  expect(typeof rootReducer).toEqual("function");
});

describe("ADD_TO_CART", function () {
  beforeEach(function () {
    action = {
      type: ADD_TO_CART,
      id: 1234
    }
    state = { cart: [] }
  });

  it("should add a product id to state.cart", function () {
    expect(rootReducer(state, action)).toEqual({cart: [1234]})
  });

  it("should be a pure function", function () {
    rootReducer(state, action)
    expect(state).toEqual({ cart: [] });
  });
});

describe("REMOVE_FROM_CARt", function () {
  beforeEach(function () {
    action = {
      type: REMOVE_FROM_CART,
      id: 1234
    }
    state = {cart: [1234, 4321]}
  });

  it("should delete a product id from state.cart", function () {
    expect(rootReducer(state, action)).toEqual({ cart: [4321]});
  })

  it("should delete only one product id from state.cart", function () {
    state.cart.push(1234)
    expect(rootReducer(state, action)).toEqual({ cart: [4321, 1234]});
  })

  it("should be a pure function", function () {
    rootReducer(state, action)
    expect(state).toEqual({cart: [1234, 4321]});
  });
});