diff --git a/src/lib/__tests__/apiUtils.test.ts b/src/lib/__tests__/apiUtils.test.ts
index fbd65ba..d5b3e8c 100644
--- a/src/lib/__tests__/apiUtils.test.ts
+++ b/src/lib/__tests__/apiUtils.test.ts
@@ -1,5 +1,5 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest';
-import { handleErrorResponse, getAuthenticatedUser } from '../apiUtils';
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { handleErrorResponse, getAuthenticatedUser, handleRateLimit } from '../apiUtils';
 import { NextResponse } from 'next/server';
 import { getServerSession } from "next-auth";
 
@@ -97,4 +97,47 @@ describe('apiUtils', () => {
       expect(result).toBeNull();
     });
   });
+
+  describe('handleRateLimit', () => {
+    beforeEach(() => {
+      vi.useFakeTimers();
+      vi.setSystemTime(new Date(1600000000000)); // Timestamp: 1600000000
+    });
+
+    afterEach(() => {
+      vi.useRealTimers();
+    });
+
+    it('should throw RateLimitError using the reset timestamp from the X-RateLimit-Reset header', () => {
+      const resetTimestamp = 1600003600;
+      const headers = new Headers();
+      headers.set('X-RateLimit-Reset', resetTimestamp.toString());
+      const res = new Response(null, { headers });
+
+      expect(() => handleRateLimit(res)).toThrowError(
+        `GitHub API rate limit exceeded. Resets at ${new Date(resetTimestamp * 1000).toISOString()}`
+      );
+    });
+
+    it('should throw RateLimitError using default time + 3600s if X-RateLimit-Reset header is missing', () => {
+      const headers = new Headers();
+      const res = new Response(null, { headers });
+      const expectedResetTimestamp = Math.floor(Date.now() / 1000) + 3600;
+
+      expect(() => handleRateLimit(res)).toThrowError(
+        `GitHub API rate limit exceeded. Resets at ${new Date(expectedResetTimestamp * 1000).toISOString()}`
+      );
+    });
+
+    it('should throw RateLimitError using default time + 3600s if X-RateLimit-Reset header is invalid', () => {
+      const headers = new Headers();
+      headers.set('X-RateLimit-Reset', 'invalid');
+      const res = new Response(null, { headers });
+      const expectedResetTimestamp = Math.floor(Date.now() / 1000) + 3600;
+
+      expect(() => handleRateLimit(res)).toThrowError(
+        `GitHub API rate limit exceeded. Resets at ${new Date(expectedResetTimestamp * 1000).toISOString()}`
+      );
+    });
+  });
 });