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app.test.js
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app.test.js
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// const { getScore, login } = require('./app')
const app = require('./app')
const { fetchSomeData, getScore, login } = require('./app')
it('should get A', () => {
expect(getScore(50)).toEqual('A')
expect(getScore(100)).toEqual('A')
})
it('should get F', () => {
expect(getScore(1)).toEqual('F')
expect(getScore(49)).toEqual('F')
})
it('should login', async () => {
const isLoggedIn = await login()
expect(isLoggedIn).toBe(true)
})
it('should works with async', async () => {
const response = await fetchSomeData()
expect(response).toEqual('success')
})
it('should works with resolves', async () => {
await expect(fetchSomeData()).resolves.toEqual('success')
})
describe('mock functions', () => {
it('should works with jest.fn()', () => {
let myMock = fetchSomeData
myMock = jest.fn()
expect(myMock()).toEqual(undefined)
})
it('should works with mockReturnValue', () => {
const myMock = jest.fn() // สร้าง myMock เป็น mock function
myMock.mockReturnValue('hello world') // mock ค่าตอน return ให้มัน
expect(myMock()).toEqual('hello world')
})
it('should works with jest.fn() and mockResolvedValue', async () => {
let myMock = fetchSomeData
myMock = jest.fn()
myMock.mockResolvedValue('success from mock data')
await expect(myMock()).resolves.toEqual('success from mock data')
})
it('spyOn and custom response', async () => {
const spy = jest.spyOn(app, 'fetchSomeData').mockResolvedValue('fail')
const isLoggedIn = await app.login()
expect(isLoggedIn).toBe(false)
expect(spy).toHaveBeenCalled()
app.fetchSomeData.mockRestore()
})
})