formatter tests

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

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+import { describe, it, expect } from 'vitest';
+import { WinRateFormatter } from './WinRateFormatter';
+
+describe('WinRateFormatter', () => {
+  describe('calculate', () => {
+    it('should return "0.0" when no races completed', () => {
+      expect(WinRateFormatter.calculate(0, 0)).toBe('0.0');
+    });
+
+    it('should calculate win rate correctly', () => {
+      expect(WinRateFormatter.calculate(10, 5)).toBe('50.0');
+      expect(WinRateFormatter.calculate(100, 25)).toBe('25.0');
+      expect(WinRateFormatter.calculate(100, 75)).toBe('75.0');
+    });
+
+    it('should handle 100% win rate', () => {
+      expect(WinRateFormatter.calculate(10, 10)).toBe('100.0');
+    });
+
+    it('should handle 0% win rate', () => {
+      expect(WinRateFormatter.calculate(10, 0)).toBe('0.0');
+    });
+
+    it('should handle decimal win rates', () => {
+      expect(WinRateFormatter.calculate(10, 3)).toBe('30.0');
+      expect(WinRateFormatter.calculate(10, 7)).toBe('70.0');
+    });
+  });
+
+  describe('format', () => {
+    it('should format rate with 1 decimal place and % sign', () => {
+      expect(WinRateFormatter.format(50.0)).toBe('50.0%');
+      expect(WinRateFormatter.format(25.5)).toBe('25.5%');
+      expect(WinRateFormatter.format(100.0)).toBe('100.0%');
+    });
+
+    it('should handle null rate', () => {
+      expect(WinRateFormatter.format(null)).toBe('0.0%');
+    });
+
+    it('should handle undefined rate', () => {
+      expect(WinRateFormatter.format(undefined)).toBe('0.0%');
+    });
+
+    it('should handle zero rate', () => {
+      expect(WinRateFormatter.format(0)).toBe('0.0%');
+    });
+
+    it('should handle decimal rates', () => {
+      expect(WinRateFormatter.format(12.34)).toBe('12.3%');
+      expect(WinRateFormatter.format(99.99)).toBe('100.0%');
+    });
+  });
+});