formatter tests

apps/website/lib/formatters/PercentFormatter.test.ts

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+import { describe, it, expect } from 'vitest';
+import { PercentFormatter } from './PercentFormatter';
+
+describe('PercentFormatter', () => {
+  describe('format', () => {
+    it('should format decimal value as percentage with 1 decimal place', () => {
+      expect(PercentFormatter.format(0.1234)).toBe('12.3%');
+      expect(PercentFormatter.format(0.5)).toBe('50.0%');
+      expect(PercentFormatter.format(1.0)).toBe('100.0%');
+    });
+
+    it('should handle zero', () => {
+      expect(PercentFormatter.format(0)).toBe('0.0%');
+    });
+
+    it('should handle null', () => {
+      expect(PercentFormatter.format(null)).toBe('0.0%');
+    });
+
+    it('should handle undefined', () => {
+      expect(PercentFormatter.format(undefined)).toBe('0.0%');
+    });
+
+    it('should handle negative values', () => {
+      expect(PercentFormatter.format(-0.1234)).toBe('-12.3%');
+    });
+
+    it('should handle values greater than 1', () => {
+      expect(PercentFormatter.format(1.5)).toBe('150.0%');
+      expect(PercentFormatter.format(2.0)).toBe('200.0%');
+    });
+  });
+
+  describe('formatWhole', () => {
+    it('should format whole number as percentage', () => {
+      expect(PercentFormatter.formatWhole(12)).toBe('12%');
+      expect(PercentFormatter.formatWhole(50)).toBe('50%');
+      expect(PercentFormatter.formatWhole(100)).toBe('100%');
+    });
+
+    it('should handle zero', () => {
+      expect(PercentFormatter.formatWhole(0)).toBe('0%');
+    });
+
+    it('should handle null', () => {
+      expect(PercentFormatter.formatWhole(null)).toBe('0%');
+    });
+
+    it('should handle undefined', () => {
+      expect(PercentFormatter.formatWhole(undefined)).toBe('0%');
+    });
+
+    it('should round decimal values', () => {
+      expect(PercentFormatter.formatWhole(12.3)).toBe('12%');
+      expect(PercentFormatter.formatWhole(12.7)).toBe('13%');
+    });
+
+    it('should handle negative values', () => {
+      expect(PercentFormatter.formatWhole(-12)).toBe('-12%');
+    });
+  });
+});