Vitest 5 vs Jest Comparison

// Vitest 5 - Test for the function that calculates cart total
// vitest.config.ts shares vite.config.ts; no extra transform needed
import { describe, it, expect, vi } from 'vitest'
import { calculateCartTotal } from './cart'
import { fetchDiscount } from './discount-api'

vi.mock('./discount-api')

describe('calculateCartTotal', () => {
  // Vitest 5: clearMocks defaults to true, no extra cleanup call needed
  it('indirim kodu olmadan ara toplami dogru hesaplar', () => {
    const items = [
      { price: 129.9, qty: 2 },
      { price: 49.5, qty: 1 },
    ]
    expect(calculateCartTotal(items)).toBeCloseTo(309.3, 2)
  })

  it('gecerli indirim kodunda vi.when ile kosullu mock kullanir', async () => {
    // Vitest 5 new API: different mock behavior based on argument
    vi.when(fetchDiscount).calledWith('SEPET10').thenResolve({ percent: 10 })
    vi.when(fetchDiscount).calledWith('GECERSIZ').thenReject(new Error('invalid code'))

    const items = [{ price: 100, qty: 1 }]
    const total = await calculateCartTotal(items, 'SEPET10')

    expect(total).toBeCloseTo(90, 2)
    expect(fetchDiscount).toHaveBeenCalledWith('SEPET10')
  })

  it('gecersiz kod hata firlatir', async () => {
    vi.when(fetchDiscount).calledWith('GECERSIZ').thenReject(new Error('invalid code'))
    const items = [{ price: 100, qty: 1 }]

    await expect(calculateCartTotal(items, 'GECERSIZ')).rejects.toThrow('invalid code')
  })
})

// Monorepo: vitest -p web --coverage (only the 'web' project + coverage report)

// Jest 30 - Test for the function that calculates cart total
// babel.config.js or a ts-jest transform chain must be set up separately
const { calculateCartTotal } = require('./cart')
const { fetchDiscount } = require('./discount-api')

jest.mock('./discount-api')

describe('calculateCartTotal', () => {
  afterEach(() => {
    jest.clearAllMocks() // Not the default in Jest, called manually
  })

  it('indirim kodu olmadan ara toplami dogru hesaplar', () => {
    const items = [
      { price: 129.9, qty: 2 },
      { price: 49.5, qty: 1 },
    ]
    expect(calculateCartTotal(items)).toBeCloseTo(309.3, 2)
  })

  it('gecerli indirim kodunda mockResolvedValue kullanir', async () => {
    fetchDiscount.mockImplementation((code) => {
      if (code === 'SEPET10') return Promise.resolve({ percent: 10 })
      return Promise.reject(new Error('invalid code'))
    })

    const items = [{ price: 100, qty: 1 }]
    const total = await calculateCartTotal(items, 'SEPET10')

    expect(total).toBeCloseTo(90, 2)
    expect(fetchDiscount).toHaveBeenCalledWith('SEPET10')
  })

  it('gecersiz kod hata firlatir', async () => {
    fetchDiscount.mockRejectedValue(new Error('invalid code'))
    const items = [{ price: 100, qty: 1 }]

    await expect(calculateCartTotal(items, 'GECERSIZ')).rejects.toThrow('invalid code')
  })
})

// Run only the 'web' package in the monorepo with jest --projects packages/web --coverage