feat: add vitest for testing and implement tests for calculateDay utility

- Added "test" script to package.json for running vitest.
- Updated api.js to use localhost for backend during development.
- Created utils.spec.js to test calculateDay function with various scenarios.
- Updated vite.config.js to include vitest configuration and conditionally load Vue DevTools.

frontend/src/api/api.js

@@ -4,7 +4,8 @@ import router from '@/router'
 import { useAuthStore } from '@/stores/authStore'
 
 const api = axios.create({
-  baseURL: '/odoo/api', // Twój backend
+  // baseURL: '/odoo/api', // Twój backend
+  baseURL: 'http://localhost:8000', // Twój backend
 })
 
 // Request interceptor – dodawanie tokena

frontend/src/utils/utils.spec.js

@@ -0,0 +1,116 @@
+import { describe, it, expect, beforeEach, vi } from 'vitest'
+import utils from './utils.js'
+
+const { calculateDay } = utils
+
+describe('calculateDay', () => {
+  let day
+
+  beforeEach(() => {
+    day = {
+      entryTime: [],
+      exitTime: [],
+      isHolidayLeave: false,
+      isSickLeave: false,
+      dayOfWeek: 'Pn', // Monday
+      isPublicHoliday: false,
+      workedHours: 0,
+      overtime: 0,
+    }
+  })
+
+  it('should calculate worked hours and overtime for a standard workday', () => {
+    day.entryTime = ['08:00:00']
+    day.exitTime = ['16:30:00'] // 8.5 hours of work
+    const totalHours = calculateDay(day)
+
+    // 8.5 hours - 0.25 break = 8.25 workedHours
+    // 8.25 workedHours - 8 standard hours = 0.25 overtime
+    // totalHours should be workedHours, so 8.25
+    expect(day.workedHours).toBe(8.25)
+    expect(day.overtime).toBe(0.25)
+    expect(totalHours).toBe(8.25)
+  })
+
+  it('should handle multiple entries and exits', () => {
+    day.entryTime = ['08:00:00', '13:00:00']
+    day.exitTime = ['12:00:00', '16:30:00'] // 4h + 3.5h = 7.5h
+    const totalHours = calculateDay(day)
+
+    // 7.5 hours - 0.25 break = 7.25 workedHours
+    // 7.25 workedHours - 8 standard hours = -0.75 overtime
+    expect(day.workedHours).toBe(7.25)
+    expect(day.overtime).toBe(-0.75)
+    expect(totalHours).toBe(7.25)
+  })
+
+  it('should calculate hours correctly when currently clocked in', () => {
+    // Mock Date for consistent results
+    const now = new Date('2025-10-29T12:00:00')
+    vi.setSystemTime(now)
+
+    day.entryTime = ['09:00:00']
+    day.exitTime = [] // Clocked in
+    const totalHours = calculateDay(day)
+
+    // 9:00 to 12:00 is 3 hours
+    // 3 hours - 0.25 break = 2.75 workedHours
+    expect(day.workedHours).toBe(2.75)
+    expect(day.overtime).toBe(2.75 - 8) // -5.25
+    expect(totalHours).toBe(2.75)
+
+    vi.useRealTimers()
+  })
+
+  it('should return 0 for a day with no entries', () => {
+    const totalHours = calculateDay(day)
+    expect(day.workedHours).toBe(0)
+    expect(day.overtime).toBe(-8)
+    expect(totalHours).toBe(0)
+  })
+
+  it('should handle holiday leave', () => {
+    day.isHolidayLeave = true
+    const totalHours = calculateDay(day)
+    expect(day.workedHours).toBe(0)
+    expect(day.overtime).toBe(0) // Overtime is just workedHours on non-work days
+    expect(totalHours).toBe(8) // 0 worked + 8 holiday
+  })
+
+  it('should handle sick leave', () => {
+    day.isSickLeave = true
+    const totalHours = calculateDay(day)
+    expect(day.workedHours).toBe(0)
+    expect(day.overtime).toBe(0)
+    expect(totalHours).toBe(6.4) // 0 worked + 6.4 sick
+  })
+
+  it('should handle sick leave and holiday leave', () => {
+    day.isHolidayLeave = true
+    day.isSickLeave = true
+    const totalHours = calculateDay(day)
+    expect(day.workedHours).toBe(0)
+    expect(day.overtime).toBe(0)
+    expect(totalHours).toBe(14.4) // 0 worked + 8 holiday + 6.4 sick
+  })
+
+  it('should not subtract break time if worked hours are 0', () => {
+    day.entryTime = []
+    day.exitTime = []
+    const totalHours = calculateDay(day)
+    expect(day.workedHours).toBe(0)
+    expect(totalHours).toBe(0)
+  })
+
+  it('should calculate overtime as workedHours on a weekend', () => {
+    day.dayOfWeek = 'So' // Sunday
+    day.entryTime = ['10:00:00']
+    day.exitTime = ['12:00:00'] // 2 hours of work
+    const totalHours = calculateDay(day)
+
+    // 2 hours - 0.25 break = 1.75
+    expect(day.workedHours).toBe(1.75)
+    expect(day.overtime).toBe(1.75) // On non-work days, all worked time is overtime
+    expect(totalHours).toBe(1.75)
+  })
+})