Node.js 是否可以在节点中为没有catch块的promise编写jest单元测试?
有什么问题 我正在尝试编写一个带有用户登录名的基本react django样板文件。我正在使用Node.js 是否可以在节点中为没有catch块的promise编写jest单元测试?,node.js,reactjs,unit-testing,jestjs,redux-saga,Node.js,Reactjs,Unit Testing,Jestjs,Redux Saga,有什么问题 我正在尝试编写一个带有用户登录名的基本react django样板文件。我正在使用react saga处理登录流 我有一个调用登录函数的传奇,它ping服务器并获取令牌。这个故事处理了所有的错误处理。如果该调用失败,则会成功返回错误以作出反应并显示给用户。它工作正常 我正在尝试为登录函数编写一个单元测试。我认为节点正在捕获我的错误:unhandledPromisejectionWarning:unhandledPromisejection。此错误源于在没有catch块的情况下抛出异步
react saga
处理登录流
我有一个调用登录函数的传奇,它ping服务器并获取令牌。这个故事处理了所有的错误处理。如果该调用失败,则会成功返回错误以作出反应并显示给用户。它工作正常
我正在尝试为登录函数编写一个单元测试。我认为节点正在捕获我的错误:unhandledPromisejectionWarning:unhandledPromisejection。此错误源于在没有catch块的情况下抛出异步函数内部,或者拒绝未使用.catch()处理的承诺。
我猜因为saga在现实中捕捉到了它,node并没有抛出那个错误
这是否意味着我不能单元测试登录函数是否会抛出未捕获的错误
我应该不去测试这个吗
代码
这是调用服务器的函数
# Auth login function
login(email, password) {
// If user is already logged in return true.
if (auth.loggedIn()) return Promise.resolve(true);
const credentials = btoa(`${email}:${password}`);
// Request to login
return axios({
method: "post",
url: `${SERVER_URL}/api/v1/accounts/login/`,
headers: {
Accept: "application/json",
"Content-Type": "application/json",
Authorization: `Basic ${credentials}`
}
}).then(response => {
// Save token to local storage
if (response.data.token) {
localStorage.auth_token = response.data.token;
} else {
// To Do-- throw error if server fails to return one
}
return Promise.resolve(true);
});
}
那么这就是处理逻辑的传奇
export function* authorize({
email,
password,
isRegistering,
firstName,
lastName
}) {
// We send an action that tells Redux we're sending a request
yield put({ type: SENDING_REQUEST, sending: true });
// We then try to register or log in the user, depending on the request
try {
let response;
// For either log in or registering, we call the proper function in the `auth`
// module, which is asynchronous. Because we're using generators, we can work
// as if it's synchronous because we pause execution until the call is done
// with `yield`!
if (isRegistering) {
response = yield call(
register,
email,
password,
firstName,
lastName
);
} else {
response = yield call(login, email, password);
}
return response;
} catch (error) {
// If we get an error we send Redux the appropriate action and return
yield put({
type: REQUEST_ERROR,
error: error.response.data,
sending: false
});
return false;
} finally {
// When done, we tell Redux we're not in the middle of a request any more
yield put({ type: SENDING_REQUEST, sending: false });
}
}
这是我的单元测试:
describe("login function", () => {
let mock;
beforeEach(() => {
mock = new MockAdapter(axios);
localStorage.clear();
});
afterEach(() => {
// We need to clear mocks
// and remove tokens from local storage to prevent
// us from staying logged in
mock.restore();
});
test("Check that exception thrown on server error", () => {
// Mock loggedin function to throw error
mock.onPost().reply(500);
Test that error is uncaught.
expect(() => {
auth.login("test@example.com", "pass").then(value => {
console.log(value);
});
}).toThrow();
});
});
你可以测试一下
toThrow
方法用于捕获抛出的错误,但promise拒绝错误,因此需要使用不同的API。捕获错误。拒绝.toThrow()代码>您还应等待expect块完成,从而导致:
describe("login function", () => {
let mock;
beforeEach(() => {
mock = new MockAdapter(axios);
localStorage.clear();
});
afterEach(() => {
// We need to clear mocks
// and remove tokens from local storage to prevent
// us from staying logged in
mock.restore();
});
test("Check that exception thrown on server error", async () => {
// Mock loggedin function to throw error
mock.onPost().reply(500);
Test that error is uncaught.
await expect(() => auth.login("test@example.com", "pass")).rejects.toThrow(); // add an error message to check for correct error
});
});
注:这在中有很好的记录。()=>
应该省略,因为登录
实际上不会抛出。