我正在开玩笑地为使用来自不同模块的常量的模块编写测试。 我想为每个测试用例为其设置不同的值,但我似乎无法这样做。
测试文件:
import { Request, Response } from 'express';
const activityConsumer = require('../../src/utils/activity.consumer');
const mockRequest = {
params: {
activityArn: 'activityArn'
}
} as Request;
const mockedJsonFunction = jest.fn();
const mockResponse: any = {
json: jest.fn(),
status: jest.fn().mockReturnValue({ json: mockedJsonFunction }),
} as Response;
let stopConsumerMock;
describe('consumer handler', () => {
beforeAll(() => {
stopConsumerMock = activityConsumer.stopConsumer = jest.fn().mockReturnValue(1);
});
beforeEach(() => {
jest.resetModules();
});
afterEach(() => {
stopConsumerMock.mockClear();
mockResponse.json.mockClear();
});
describe('stopConsumingHandler', () => {
it('Should return success true and not call stopConsumer when no consumer exists', () => {
activityConsumer.consumer = undefined;
const { stopConsumingHandler } = require ('../../src/handlers/consumer.handlers');
stopConsumingHandler(mockRequest, mockResponse);
expect(stopConsumerMock.mock.calls.length).toEqual(0);
expect(mockResponse.json.mock.calls.length).toEqual(1);
expect(mockResponse.json).toHaveBeenCalledWith({ success: true });
});
it('Should return success true and call stopConsumer when consumer exists', () => {
activityConsumer.consumer = true;
const { stopConsumingHandler } = require ('../../src/handlers/consumer.handlers');
stopConsumingHandler(mockRequest, mockResponse);
expect(stopConsumerMock.mock.calls.length).toEqual(1);
expect(mockResponse.json.mock.calls.length).toEqual(1);
expect(mockResponse.json).toHaveBeenCalledWith({ success: true });
});
});
});
我想替换 activityConsumer.consumer
的值,然后重新加载 consumer.handlers
模块,但是重新分配和重新加载似乎没有任何效果。
请告诉我如何正确编写此测试。
答案 0 :(得分:0)
试试这个,用jest.mock
修改activityConsumer
的导入值
import { Request, Response } from 'express';
// const activityConsumer = require('../../src/utils/activity.consumer');
const mockRequest = {
params: {
activityArn: 'activityArn'
}
} as Request;
const mockedJsonFunction = jest.fn();
const mockResponse: any = {
json: jest.fn(),
status: jest.fn().mockReturnValue({ json: mockedJsonFunction }),
} as Response;
let stopConsumerMock;
describe('consumer handler', () => {
beforeAll(() => {
// stopConsumerMock = activityConsumer.stopConsumer = jest.fn().mockReturnValue(1);
stopConsumerMock = jest.fn().mockReturnValue(1);
});
beforeEach(() => {
jest.resetModules(); // important line
});
afterEach(() => {
stopConsumerMock.mockClear();
mockResponse.json.mockClear();
});
describe('stopConsumingHandler', () => {
it('Should return success true and not call stopConsumer when no consumer exists', () => {
// activityConsumer.consumer = undefined;
// mock by this way
jest.mock('../../src/utils/activity.consumer', () => ({
consumer: undefined,
stopConsumer: stopConsumerMock,
}));
const { stopConsumingHandler } = require('../../src/handlers/consumer.handlers');
stopConsumingHandler(mockRequest, mockResponse);
expect(stopConsumerMock.mock.calls.length).toEqual(0);
expect(mockResponse.json.mock.calls.length).toEqual(1);
expect(mockResponse.json).toHaveBeenCalledWith({ success: true });
});
it('Should return success true and call stopConsumer when consumer exists', () => {
// activityConsumer.consumer = true;
// mock by this way
jest.mock('../../src/utils/activity.consumer', () => ({
consumer: true, // mock value for consumer
stopConsumer: stopConsumerMock,
}));
const { stopConsumingHandler } = require('../../src/handlers/consumer.handlers');
stopConsumingHandler(mockRequest, mockResponse);
expect(stopConsumerMock.mock.calls.length).toEqual(1);
expect(mockResponse.json.mock.calls.length).toEqual(1);
expect(mockResponse.json).toHaveBeenCalledWith({ success: true });
});
});
});