do to formatters

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

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import { DashboardRankDisplay } from './DashboardRankFormatter';
+
+describe('DashboardRankDisplay', () => {
+  describe('happy paths', () => {
+    it('should format rank correctly', () => {
+      expect(DashboardRankDisplay.format(1)).toBe('1');
+      expect(DashboardRankDisplay.format(42)).toBe('42');
+      expect(DashboardRankDisplay.format(100)).toBe('100');
+    });
+  });
+
+  describe('edge cases', () => {
+    it('should handle rank 0', () => {
+      expect(DashboardRankDisplay.format(0)).toBe('0');
+    });
+
+    it('should handle large ranks', () => {
+      expect(DashboardRankDisplay.format(999999)).toBe('999999');
+    });
+  });
+});