test(cache): verify TTLCache behavior for infinite TTL value (Variation 1) (JhaSourav07#1603)

## Description

Fixes JhaSourav07#1390

## Pillar

- [ ] 🎨 Pillar 1 — New Theme Design
- [ ] 📐 Pillar 2 — Geometric SVG Improvement
- [ ] 🕐 Pillar 3 — Timezone Logic Optimization
- [x] 🛠️ Other (Bug fix, refactoring, docs, testing)

## Visual Preview
No visual UI updates (Pure edge-case boundary unit test coverage
addition for the `TTLCache` utility).

## Checklist before requesting a review:

- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally.
- [x] I have run the isolated file prettier formatter.
- [x] My commits follow the Conventional Commits format (`test(cache):
...`).
- [x] I have made sure that I have only one clean commit to merge in
this PR.

Author: JhaSourav07

lib/cache.test.ts

@@ -473,6 +473,20 @@ describe('TTLCache', () => {
 
       cache.destroy();
     });
+
+    it('verify TTLCache behavior for infinite TTL value (Variation 1)', () => {
+      const cache = new TTLCache<string>();
+
+      expect(() => {
+        cache.set('infinite-key', 'boundary-value', Infinity);
+      }).not.toThrow();
+
+      expect(cache.get('infinite-key')).toBe('boundary-value');
+
+      expect(cache.has('infinite-key')).toBe(true);
+
+      cache.destroy();
+    });
   });
 });