我正在学习反应还原,我目前正在使用TDD实现一些减速器。我正在使用示例应用程序,它只是一个用于添加/删除/打开/关闭笔记的记事本。
我正在为添加新笔记进行一些测试,但第二个"它"失败了,引发我的错误如下:
1)AddNote reducer应返回两个注释: AssertionError:期望{Object(id-123,id-456)}等于{Object(byId,ids,...)}
describe('AddNote reducer' , () => {
it('should return a new note', () => {
const state = getMockState.withNoNotes();
const actualNextState = reducers.byId(
state.byId, actions.addNote(
'Hello World', 'id-123', 1));
const expectedNextState = {
'id-123': {
id: 'id-123',
content: 'Hello World',
timestamp: 1
}
};
expect(actualNextState).to.deep.equal(expectedNextState);
});
it('should return two notes', () => {
const state = getMockState.withOneNote();
const actualNextState = reducers.byId(state.byId, actions.addNote('Bye bye world!', 'id-456', 2));
const expectedNextState = {
...state,
'id-456': {
id: 'id-456',
content: 'Bye bye world!',
timestamp: 2
}
};
expect(actualNextState).to.deep.equal(expectedNextState);
});
});
我还使用了帮助器,这里是
export const getMockState = {
withNoNotes: () => ({
byId: {},
ids: [],
openNoteId: null,
}),
withOneNote: () => ({
byId: {
'id-123': {
id: 'id-123',
content: 'Hello world',
timestamp: 1,
},
},
ids: ['id-123'],
openNoteId: 'id-123',
}),
};
我的想法是,如果我在第一种情况下添加一个音符,它将返回一个只有该音符的新状态,但在第二种情况下,它应该返回一个带有前一音符的状态,加上新音符。 我使用 Chai期望库使用mocha。
如果它有助于输出状态(它是控制台日志),我认为没问题,
{ 'id-123': { id: 'id-123', content: 'Hello World', timestamp: 1 } }
√ should return a new note
{ 'id-123': { id: 'id-123', content: 'Hello world', timestamp: 1 },
'id-456': { id: 'id-456', content: 'Bye bye world!', timestamp: 2 } }
1) should return two notes
这里是我的减速机
import { merge } from 'ramda';
export const byId = (state={}, {type, payload}) => {
switch(type) {
case 'app/addNote':
console.log(merge(state, { [payload.id]: payload})) ;
return merge(state, { [payload.id]: payload});
default:
return state;
}
};
有什么想法吗?提前谢谢!
答案 0 :(得分:1)
您的expectedState
不正确。您正在比较"下一个状态" byId
切片,但您的expectedNextState
扩展了整个州。它应该是:
const expectedNextState = {
...state.byId,
'id-456': {
id: 'id-456',
content: 'Bye bye world!',
timestamp: 2
}
};