add failing test

packages/ui/src/utils/__tests__/utils.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from 'vitest'
+
+import { formatDate } from '../utils'
+
+describe('formatDate', () => {
+  it('should format a Unix timestamp to a localized date string', () => {
+    const timestamp = 1642774800000
+    const result = formatDate(timestamp)
+    expect(result).toBe('Jan 21, 2022')
+  })
+
+  it('should format an ISO date string to a localized date string with full style', () => {
+    const timestamp = '2022-01-21'
+    const result = formatDate(timestamp, 'full')
+    expect(result).toBe('Friday, January 21, 2022')
+  })
+
+  it('should return an empty string if timestamp is falsy', () => {
+    const result = formatDate('')
+    expect(result).toBe('')
+  })
+
+  it('should handle invalid date gracefully and return an empty string', () => {
+    const result = formatDate('invalid-date')
+    expect(result).toBe('')
+  })
+})