![](/img/trans.png)
[英]Testing asynchronous code in Jest: done() not being called as expected
[英]Jest , testing Asynchronous JS code always failing
我正在嘗試測試我的節點app.js腳本,其中我對函數sendSmtpMessage()有一個異步請求sendMessageRequest()[一個承諾]
app.js
const sendSmtpMessage = require("./sendSmtpMessage.js");
const keys = {....};
const mailOptions = {...}
const sendMessageRequest = async () => {
try {
const result = await sendSmtpMessage(keys,mailOptions);
console.log("... SEND MSG REQUEST FULLFILLED: ", result);
} catch(err){
console.log("... SEND MSG REQUEST FAILED: ");
}
};
sendMessageRequest();
根據有關測試異步代碼(使用async / await)的文檔,我編寫了以下app.spec.js; 但是我想我的sendSmtpMessage()模擬是錯誤的...
app.spec.js
jest.mock("../sendSmtpMessage.js");
const sendSmtpMessage = require("../sendSmtpMessage.js");
const app = require("../app.js");
// sendSmtpMessage is a mock function
sendSmtpMessage.mockImplementation(() => {
return new Promise((resolve, reject) => {
setTimeout(() => {
(oauth2ClientMock.refreshToken !== "undefined")? resolve() : reject()
, 2000
});
})
});
describe('app', () => {
let keys, mailOptions;
beforeEach(() => {
keys = {....};
mailOptions = {....}
});
afterEach(() => {
keys = {};
mailOptions = {};
});
it("should call successfully sendMessageRequest", async () => {
// GIVEN
// WHEN
// THEN
expect.assertions(1);
await expect(sendSmtpMessage).resolves.toBe("OK");
});
it("should call unsuccessfully sendMessageRequest", async () => {
// GIVEN
// WHEN
keys.oauth.refresh_token = null;
// THEN
expect.assertions(1);
await expect(sendSmtpMessage).rejects.toBeTruthy();
});
});
由於console.log輸出顯示每個測試的兩個期望值都存在錯誤(解決和拒絕時)
console.log
開玩笑--detectOpenHandles --coverage“ app.spec.js”
失敗test / app.spec.js應用✕應該成功調用sendMessageRequest(15ms)✕應該沒有成功調用sendMessageRequest(2ms)
●應用›應成功調用sendMessageRequest
expect(received).resolves.toBe()
received value must be a Promise.
Received:
function: [Function mockConstructor]
52 | // THEN
53 | expect.assertions(1);
> 54 | await expect(sendSmtpMessage).resolves.toBe("OK");
| ^
55 | });
56 |
57 | it("should call unsuccessfully sendMessageRequest", async () => {
at Object.toBe (node_modules/expect/build/index.js:158:13)
at Object.toBe (test/app.spec.js:54:44)
●應用›應成功調用sendMessageRequest
expect.assertions(1)
Expected one assertion to be called but received zero assertion calls.
51 | // WHEN
52 | // THEN
> 53 | expect.assertions(1);
| ^
54 | await expect(sendSmtpMessage).resolves.toBe("OK");
55 | });
56 |
at Object.assertions (test/app.spec.js:53:12)
●應用›應調用失敗sendMessageRequest
expect(received).rejects.toBeTruthy()
received value must be a Promise.
Received:
function: [Function mockConstructor]
61 | // THEN
62 | expect.assertions(1);
> 63 | await expect(sendSmtpMessage).rejects.toBeTruthy();
| ^
64 | });
65 |
66 | });
at Object.toBeTruthy (node_modules/expect/build/index.js:203:13)
at Object.toBeTruthy (test/app.spec.js:63:43)
●應用›應調用失敗sendMessageRequest
expect.assertions(1)
Expected one assertion to be called but received zero assertion calls.
60 | keys.oauth.refresh_token = null;
61 | // THEN
> 62 | expect.assertions(1);
| ^
63 | await expect(sendSmtpMessage).rejects.toBeTruthy();
64 | });
65 |
at Object.assertions (test/app.spec.js:62:12)
我哪里錯了? 我不太了解此類普通js腳本的測試過程...(用於與vue.js,test-utils一起使用...)
感謝您的反饋,並最終感謝您通過任何鏈接使我了解這種情況下的測試單元...
您不是在等待sendMessageRequest方法本身的調用
const sendSmtpMessage = require("./sendSmtpMessage.js");
const keys = {....};
const mailOptions = {...}
const sendMessageRequest = async () => {
try {
const result = await sendSmtpMessage(keys,mailOptions);
console.log("... SEND MSG REQUEST FULLFILLED: ", result);
} catch(err){
console.log("... SEND MSG REQUEST FAILED: ");
}
};
(async function() {
await sendMessageRequest();
})();
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.