我正在使用redux-thunk而不确定副作用(showAlertError函数)是否结构正确。虽然我的初学测试设置乍一看似乎很好,但我得到jest.fn() value must be a mock function or spy. Received: undefined
错误。
showAlertError
函数是在正确的位置还是应该在actionCreator中,或者在其他地方?此外,如果这是正确的地方,那么我如何测试它是否被调用。
export const submitTeammateInvitation = (data) => {
const config = {
// config code
};
return async (dispatch) => {
dispatch(submitTeammateInvitationRequest(data));
try {
const response = await fetch(inviteTeammateEndpoint, config);
const jsonResponse = await response.json();
if (!response.ok) {
showErrorAlert(jsonResponse);
dispatch(submitTeammateInvitationError(jsonResponse));
throw new Error(response.statusText);
}
dispatch(submitTeammateInvitationSuccess(jsonResponse));
} catch (error) {
if (process.env.NODE_ENV === 'development') {
console.log('Request failed', error);
}
}
};
};
测试
import configureMockStore from 'redux-mock-store';
import thunk from 'redux-thunk';
import { showAlertError } from '../../../../_helpers/alerts';
jest.mock('../../../../_helpers/alerts');
const middlewares = [thunk];
const createMockStore = configureMockStore(middlewares);
describe('submitTeammateInvitation', () => {
it('dispatches the correct actions on a failed fetch request', () => {
fetch.mockResponse(
JSON.stringify(error),
{ status: 500, statusText: 'Internal Server Error' }
);
const store = createMockStore({});
const expectedActions = [
submitTeammateInvitationRequestObject,
submitTeammateInvitationErrorObject
];
const showAlertError = jest.fn();
return store.dispatch(submitTeammateInvitation(inviteTeammateEndpoint))
.then(() => {
expect(showAlertError).toBeCalled(); // this doesn't work
expect(store.getActions()).toEqual(expectedActions); // this works
});
});
});
答案 0 :(得分:0)
您可以手动模拟showErrorAlert
函数。解决方法如下:
actionCreators.ts
:
import fetch from 'node-fetch';
import { showErrorAlert } from './showErrorAlert';
const SUBMIT_TEAMATE_INVITATION_REQUEST = 'SUBMIT_TEAMATE_INVITATION_REQUEST';
const SUBMIT_TEAMATE_INVITATION_SUCCESS = 'SUBMIT_TEAMATE_INVITATION_SUCCESS';
const SUBMIT_TEAMATE_INVITATION_ERROR = 'SUBMIT_TEAMATE_INVITATION_ERROR';
export const submitTeammateInvitationRequest = data => ({ type: SUBMIT_TEAMATE_INVITATION_REQUEST, payload: { data } });
export const submitTeammateInvitationSuccess = data => ({ type: SUBMIT_TEAMATE_INVITATION_SUCCESS, payload: { data } });
export const submitTeammateInvitationError = data => ({ type: SUBMIT_TEAMATE_INVITATION_ERROR, payload: { data } });
export const submitTeammateInvitation = data => {
const config = {
// config code
};
const inviteTeammateEndpoint = 'https://github.com/mrdulin';
return async dispatch => {
dispatch(submitTeammateInvitationRequest(data));
try {
const response = await fetch(inviteTeammateEndpoint, config);
const jsonResponse = await response.json();
if (!response.ok) {
showErrorAlert(jsonResponse);
dispatch(submitTeammateInvitationError(jsonResponse));
throw new Error(response.statusText);
}
dispatch(submitTeammateInvitationSuccess(jsonResponse));
} catch (error) {
if (process.env.NODE_ENV === 'development') {
console.log('Request failed', error);
}
}
};
};
showErrorAlert.ts
:
export function showErrorAlert(jsonResponse) {
console.log(jsonResponse);
}
actionCreators.spec.ts
:
import {
submitTeammateInvitation,
submitTeammateInvitationRequest,
submitTeammateInvitationSuccess,
submitTeammateInvitationError
} from './actionCreators';
import createMockStore from 'redux-mock-store';
import thunk, { ThunkDispatch } from 'redux-thunk';
import fetch from 'node-fetch';
import { AnyAction } from 'redux';
import { showErrorAlert } from './showErrorAlert';
const { Response } = jest.requireActual('node-fetch');
jest.mock('node-fetch');
jest.mock('./showErrorAlert.ts', () => {
return {
showErrorAlert: jest.fn()
};
});
const middlewares = [thunk];
const mockStore = createMockStore<any, ThunkDispatch<any, any, AnyAction>>(middlewares);
describe('submitTeammateInvitation', () => {
it('dispatches the correct actions on a failed fetch request', () => {
const mockedResponse = { data: 'mocked response' };
const mockedJSONResponse = JSON.stringify(mockedResponse);
const mockedData = { data: 'mocked data' };
(fetch as jest.MockedFunction<typeof fetch>).mockResolvedValueOnce(
new Response(mockedJSONResponse, { status: 500, statusText: 'Internal Server Error' })
);
const intialState = {};
const store = mockStore(intialState);
const expectedActions = [
submitTeammateInvitationRequest(mockedData),
submitTeammateInvitationError(mockedResponse)
];
return store.dispatch(submitTeammateInvitation(mockedData)).then(() => {
expect(store.getActions()).toEqual(expectedActions);
expect(showErrorAlert).toBeCalledWith(mockedResponse);
});
});
});
带有覆盖率报告的单元测试结果:
PASS src/stackoverflow/47560126/actionCreators.spec.ts
submitTeammateInvitation
✓ dispatches the correct actions on a failed fetch request (11ms)
-------------------|----------|----------|----------|----------|-------------------|
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s |
-------------------|----------|----------|----------|----------|-------------------|
All files | 89.29 | 50 | 83.33 | 90.91 | |
actionCreators.ts | 89.29 | 50 | 83.33 | 90.91 | 32,35 |
-------------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 5.864s
以下是完整的演示:https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/47560126