[英]Jest expect an object with functions inside
我正在編寫一個 Jest 測試,其中我調用 function 並期望 object 作為回報,如下所示:
const repository = container => {
const makeBooking = (user, booking) => {
'make booking function called'
}
const generateTicket = (paid, booking) => {
console.log('generate ticket function called')
}
const getOrderById = orderId => {
console.log('get order by ID called')
}
const disconnect = () => {
console.log('disconnect method called')
}
return {
makeBooking,
getOrderById,
generateTicket,
disconnect
}
}
為了舉例,所有這些函數現在都是示例。 我現在,將 function 導出,然后在測試中使用它,如下所示:
container = {}
describe('Repository', () => {
it('should connect with a container', () => {
let hello = repository(container)
expect(hello).toMatchObject({
makeBooking: jest.fn('makeBooking'),
getOrderById: jest.fn('getOrderById'),
generateTicket: jest.fn('generateTicket'),
disconnect: jest.fn('disconnect')
})
})
})
我得到的錯誤是:
Expected value to match object:
{"disconnect": [Function mockConstructor], "generateTicket": [Function mockConstructor], "getOrderById": [Function mockConstructor], "makeBooking": [Function mockConstructor]}
Received:
{"disconnect": [Function disconnect], "generateTicket": [Function generateTicket], "getOrderById": [Function getOrderById], "makeBooking": [Function makeBooking]}
我需要模擬從存儲庫 object 返回的 object。 但是,此 object 包含命名函數,如代碼所示。 無論如何要模擬帶有內部功能的對象嗎?
您可以使用jest.spyOn
為repository
的方法制作存根。
您模擬或存根存儲庫的方法,您需要使用它們。 這就是為什么 service.js 來自哪里,當然,您可以在任何地方使用存儲庫。 所以,實際上要測試的方法是service.makeBooking
。 然后,您可以對存儲庫的makeBooking
方法進行斷言,例如,檢查存儲庫的模擬/存根makeBooking
方法是否已被調用。
在這里,我們使用依賴注入模式將模擬的hello
object 注入到service.makeBooking(hello)
方法中。
例如
repository.js
:
const repository = (container) => {
const makeBooking = (user, booking) => {
'make booking function called';
};
const generateTicket = (paid, booking) => {
console.log('generate ticket function called');
};
const getOrderById = (orderId) => {
console.log('get order by ID called');
};
const disconnect = () => {
console.log('disconnect method called');
};
return {
makeBooking,
getOrderById,
generateTicket,
disconnect,
};
};
module.exports = repository;
repository.test.js
:
const repository = require('./repository');
const container = {};
describe('Repository', () => {
it('should connect with a container', () => {
let hello = repository(container);
expect(hello).toMatchObject({
makeBooking: expect.any(Function),
getOrderById: expect.any(Function),
generateTicket: expect.any(Function),
disconnect: expect.any(Function),
});
});
it('should generate ticket', () => {
let hello = repository(container);
const logSpy = jest.spyOn(console, 'log');
hello.generateTicket();
expect(logSpy).toBeCalledWith('generate ticket function called');
});
// rest test cases same as above
});
帶有覆蓋率報告的單元測試結果:
PASS stackoverflow/61268658/repository.test.js (11.281s)
Repository
✓ should connect with a container (5ms)
✓ should generate ticket (19ms)
console.log node_modules/jest-environment-enzyme/node_modules/jest-mock/build/index.js:866
generate ticket function called
---------------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
---------------|---------|----------|---------|---------|-------------------
All files | 80 | 100 | 40 | 80 |
repository.js | 80 | 100 | 40 | 80 | 11,15
---------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 2 passed, 2 total
Snapshots: 0 total
Time: 13.132s
service.js
:
const service = {
makeBooking(hello) {
return hello.makeBooking();
},
};
module.exports = service;
service.test.js
:
const service = require('./service');
const repository = require('./repository');
const container = {};
describe('service', () => {
it('should init', () => {
let hello = repository(container);
jest.spyOn(hello, 'makeBooking').mockReturnValueOnce('fake data');
const actual = service.makeBooking(hello);
expect(actual).toEqual('fake data');
expect(hello.makeBooking).toBeCalledTimes(1);
});
});
帶有覆蓋率報告的單元測試結果:
PASS stackoverflow/61268658/service.test.js (10.94s)
service
✓ should init (4ms)
---------------|---------|----------|---------|---------|-------------------
File | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s
---------------|---------|----------|---------|---------|-------------------
All files | 76.92 | 100 | 33.33 | 76.92 |
repository.js | 70 | 100 | 20 | 70 | 7,11,15
service.js | 100 | 100 | 100 | 100 |
---------------|---------|----------|---------|---------|-------------------
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 12.278s
這就是我一直在尋找的:
expect.objectContaining({
theProperty: expect.any(Function)
})
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