feat : utilitaires de format et validation de date (#MUI-33)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/components/malio/date/composables/dateFormat.test.ts

@@ -0,0 +1,62 @@
+import {describe, expect, it} from 'vitest'
+import {formatIsoToDisplay, isDateInRange, isValidIso, parseDisplayToIso} from './dateFormat'
+
+describe('dateFormat', () => {
+  describe('isValidIso', () => {
+    it('accepts a real ISO date', () => {
+      expect(isValidIso('2026-05-19')).toBe(true)
+    })
+    it('rejects a malformed string', () => {
+      expect(isValidIso('19/05/2026')).toBe(false)
+      expect(isValidIso('2026-5-9')).toBe(false)
+      expect(isValidIso('')).toBe(false)
+    })
+    it('rejects an impossible date', () => {
+      expect(isValidIso('2026-02-30')).toBe(false)
+      expect(isValidIso('2026-13-01')).toBe(false)
+    })
+    it('accepts Feb 29 on a leap year and rejects it otherwise', () => {
+      expect(isValidIso('2024-02-29')).toBe(true)
+      expect(isValidIso('2026-02-29')).toBe(false)
+    })
+  })
+
+  describe('formatIsoToDisplay', () => {
+    it('formats ISO to DD/MM/YYYY', () => {
+      expect(formatIsoToDisplay('2026-05-19')).toBe('19/05/2026')
+    })
+    it('returns empty string for null or invalid input', () => {
+      expect(formatIsoToDisplay(null)).toBe('')
+      expect(formatIsoToDisplay('nope')).toBe('')
+    })
+  })
+
+  describe('parseDisplayToIso', () => {
+    it('parses DD/MM/YYYY to ISO', () => {
+      expect(parseDisplayToIso('19/05/2026')).toBe('2026-05-19')
+    })
+    it('returns null for malformed or impossible input', () => {
+      expect(parseDisplayToIso('2026-05-19')).toBeNull()
+      expect(parseDisplayToIso('31/02/2026')).toBeNull()
+      expect(parseDisplayToIso('')).toBeNull()
+    })
+  })
+
+  describe('isDateInRange', () => {
+    it('returns true when no bounds are given', () => {
+      expect(isDateInRange('2026-05-19')).toBe(true)
+    })
+    it('respects the min bound (inclusive)', () => {
+      expect(isDateInRange('2026-05-19', '2026-05-19')).toBe(true)
+      expect(isDateInRange('2026-05-18', '2026-05-19')).toBe(false)
+    })
+    it('respects the max bound (inclusive)', () => {
+      expect(isDateInRange('2026-05-19', undefined, '2026-05-19')).toBe(true)
+      expect(isDateInRange('2026-05-20', undefined, '2026-05-19')).toBe(false)
+    })
+    it('respects both bounds', () => {
+      expect(isDateInRange('2026-05-15', '2026-05-10', '2026-05-20')).toBe(true)
+      expect(isDateInRange('2026-05-25', '2026-05-10', '2026-05-20')).toBe(false)
+    })
+  })
+})