【发布时间】：2021-12-08 11:21:17
【问题描述】：
我有这门课：
class DataService {
constructor() {
}
async CreateItem() {
try {
return {data: true, error: null}
} catch (error) {
return {data: null, error: error}
}
}
async SendToAnalytics() {
try {
return {data: true, error: null}
} catch (error) {
return {data: null, error: error}
}
}
async SendEmail() {
try {
return {data: true, error: null}
} catch (error) {
return {data: null, error: error}
}
}
}
module.exports = DataService;
我在我的 Lambda 处理程序中调用这些方法：
const DataService = require("../services/data.service");
exports.handler = async (event) => {
try {
const dataService = new DataService();
const createItem = await dataService.CreateItem();
if (createItem.error) {
return {statusCode: 500};
}
const sendToAnalytics = await dataService.SendToAnalytics();
if (sendToAnalytics.error) {
return {statusCode: 500};
}
const sendEmail = await dataService.SendEmail();
if (sendEmail.error) {
return {statusCode: 500};
}
return {statusCode: 200};
} catch (e) {
return {statusCode: 500};
}
};
我想覆盖 100% 的代码，这是我的 handler.spec 文件
const { handler } = require("./handler");
const DataService = require("../services/data.service");
jest.mock("../services/data.service", () => {
return jest.fn().mockImplementation(() => {
return {
CreateItem: jest.fn(() => ({ data: true, error: null })),
SendToAnalytics: jest.fn(() => ({ data: true, error: null })),
SendEmail: jest.fn(() => ({ data: true, error: null })),
};
});
});
const dataService = new DataService();
describe("Job Apply Handler", () => {
afterAll(() => {
jest.resetAllMocks();
});
it("Successful response", async () => {
const res = await handler();
expect(res.statusCode).toEqual(200);
});
it("Error Response because of CreateItem Error", async () => {
dataService.SaveApplicant.mockImplementationOnce(
jest.fn(() => ({ data: null, error: true }))
);
const res = await handler();
expect(res.statusCode).toEqual(500);
});
it("Error Response because of SendToAnalytics Error", async () => {
dataService.SendToAnalytics.mockImplementationOnce(
jest.fn(() => ({ data: null, error: true }))
);
//DOES NOT ENTER inside if(sendToAnalyticsError)
// CreateItem is still mocked to return error: true
const res = await handler();
expect(res.statusCode).toEqual(500);
});
it("Error Response because of SendEmail Error", async () => {
dataService.SendToAnalytics.mockImplementationOnce(
jest.fn(() => ({ data: null, error: true }))
);
//DOES NOT ENTER inside if(sendEmail.error)
// CreateItem is still mocked to return error: true
const res = await handler();
expect(res.statusCode).toEqual(500);
});
it("Error Response because of Exception", async () => {
dataService.SendToAnalytics.mockImplementationOnce(
jest.fn(() => {
throw new Error("error");
})
);
const res = await handler();
expect(res.statusCode).toEqual(500);
});
});
我想我是在嘲笑错误的方法。由于在模拟返回错误后我无法重置 CreateItem()，所有其他情况都出现在第一个 IF 语句中。
有什么建议吗？
【问题讨论】：
标签： javascript unit-testing jestjs mocking