diff --git a/src/features/Pokedex/Pokemon/Pokemon.test.ts b/src/features/Pokedex/Pokemon/Pokemon.test.ts
new file mode 100644
index 0000000..6b1fecc
--- /dev/null
+++ b/src/features/Pokedex/Pokemon/Pokemon.test.ts
@@ -0,0 +1,15 @@
+import { formatNumber } from './Pokemon';
+
+describe('Test Functions', () => {
+  describe('formatNumber', () => {
+    it('should format single digit integer correctly', () => {
+      expect(formatNumber(6)).toBe('#006');
+    });
+    it('should format double digit integer correctly', () => {
+      expect(formatNumber(16)).toBe('#016');
+    });
+    it('should format triple digit integer correctly', () => {
+      expect(formatNumber(116)).toBe('#116');
+    });
+  });
+});