javascript 如何修复 TypeError 不是一个函数（用 Jest 测试 promise）
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原文地址: http://stackoverflow.com/questions/48508225/
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How to fix TypeError is not a function (testing promises with Jest)
提问by Leon Gaban
I have a passing test now thanks to the answer here: How to test is chained promises in a jest test?
由于这里的答案，我现在通过了测试：How to test is chained promises in a jest test?
However I'm still getting an error in the catch part of my test.
但是，我在测试的 catch 部分仍然遇到错误。
I seem to not be able to correctly mock or spy this part in the actions file: .then(res => res.getIdToken())
我似乎无法在操作文件中正确模拟或监视这部分： .then(res => res.getIdToken())
TEST signIn ERROR => TypeError: res.getIdToken is not a function
测试登录错误 => 类型错误：res.getIdToken 不是函数
The Test
考试
jest.mock('services/firebase', () => new Promise(resolve => resolve({
signInWithEmailAndPassword: () => Promise.resolve({ getIdToken: 'abc123' }),
getIdToken: () => jest.fn(),
signOut: () => jest.fn()
})));
describe('login actions', () => {
let store;
beforeEach(() => {
store = mockStore({});
});
it('signIn should call firebase', () => {
const user = {
email: '[email protected]',
password: 'abd123'
};
return store.dispatch(signIn(user.email, user.password))
.then(() => {
console.log('TEST signIn SUCCESS');
expect(mockSignIn).toHaveBeenCalled();
expect(store.getActions()).toEqual({
type: USER_ON_LOGGED_IN
});
})
.catch((err) => {
console.log('TEST signIn ERROR =>', err);
});
});
The SignIn actions/Login
登录操作/登录
// Sign in action
export const signIn = (email, password, redirectUrl = ROUTEPATH_DEFAULT_PAGE) => (dispatch) => {
dispatch({ type: USER_LOGIN_PENDING });
return firebase
.then((auth) => {
console.log('auth =>', auth);
return auth.signInWithEmailAndPassword(email, password);
})
.catch((e) => {
console.error('actions/Login/signIn', e);
// Register a new user
if (e.code === LOGIN_USER_NOT_FOUND) {
dispatch(push(ROUTEPATH_FORBIDDEN));
dispatch(toggleNotification(true, e.message, 'error'));
} else {
dispatch(displayError(true, e.message));
setTimeout(() => {
dispatch(displayError(false, ''));
}, 5000);
throw e;
}
})
// I can't seem to mock this correctly
.then(res => res.getIdToken())
.then((idToken) => {
if (!idToken) {
dispatch(displayError(true, 'Sorry, there was an issue with getting your token.'));
}
dispatch(onCheckAuth(email));
dispatch(push(redirectUrl));
});
};
采纳答案by Swivel
It looks like the reason why you're getting this error has to do with the data you're mocking through Jest.
看起来您收到此错误的原因与您通过 Jest 模拟的数据有关。
Try using jest.fn()to mock your getIdTokenas a function, rather than a string:
尝试使用jest.fn()模拟您getIdToken的函数，而不是字符串：
const mockGetIdToken = jest.fn(() => 'abc123');
jest.mock('services/firebase', () => new Promise(resolve => resolve({
signInWithEmailAndPassword: () => Promise.resolve({ getIdToken: mockGetIdToken }),
getIdToken: mockGetIdToken,
signOut: () => jest.fn()
})));
describe('login actions', () => {
let store;
beforeEach(() => {
store = mockStore({});
});
it('signIn should call firebase', () => {
const user = {
email: '[email protected]',
password: 'abd123'
};
return store.dispatch(signIn(user.email, user.password))
.then(() => {
console.log('TEST signIn SUCCESS');
expect(mockSignIn).toHaveBeenCalled();
expect(store.getActions()).toEqual({
type: USER_ON_LOGGED_IN
});
})
.catch((err) => {
console.log('TEST signIn ERROR =>', err);
});
});
