Question

我得到了

ReferenceError：未定义initialState

当我在beforeEach(()=> {...中将initialState声明为const时。应该不应该工作吗？

describe('register reducer', () => {
        beforeEach(() => {
            const initialState = UsersService.getInitialUsersState();
        })

        it('should return the initial state', () => {
            expect(usersReducer(undefined, [])).toEqual(initialState);
        });

        it('Toggle isBaby or sitter', () => {
            deepFreeze(initialState);
            let newState = initialState;
            newState.isBaby = true;

            expect(
                usersReducer(initialState, {
                    type: types.UsersActions.SET_TYPE,
                    payload: true
                })).toEqual(newState);
        });

Answer 1

虽然beforeEach在每次测试之前运行都是正确的，但如果您这样做，initialState仅在beforeEach的范围内可见，请将其更改为此：

describe('register reducer', () => {
  let initialState;
  beforeEach(() => {
      initialState = UsersService.getInitialUsersState();
  })
  ...

Answer 2

这个问题确实很老，但是在这里为遇到这个问题的其他人提供一个有效的例子。这是您可以做到的一种方法：

describe('register reducer', () => {
        let initialState
        beforeEach(() => {
            initialState = UsersService.getInitialUsersState();
        })

        it('should return the initial state', () => {
            expect(usersReducer(undefined, [])).toEqual(initialState);
        });

        it('Toggle isBaby or sitter', () => {
            deepFreeze(initialState);
            let newState = initialState;
            newState.isBaby = true;

            expect(
                usersReducer(initialState, {
                    type: types.UsersActions.SET_TYPE,
                    payload: true
                })).toEqual(newState);
        });

在beforeEach中声明变量

2 个答案: