test: add test suite for uuid service

tests/services/uuid.spec.ts

@@ -0,0 +1,18 @@
+import { expect } from 'chai';
+import { describe, it } from 'mocha';
+import { uuid } from '../../src/services/uuid';
+
+describe('UUID Service', function() {
+  this.timeout(1000);
+
+  it('provides universal unique identifiers', () => {
+    const uuid1 = uuid();
+    expect(uuid1).to.match(
+      /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/i,
+      'generated uuid does not match the UUID format'
+    );
+    const uuid2 = uuid();
+    const uuid3 = uuid();
+    expect(uuid2).to.not.equal(uuid3, 'generated uuids are not unique');
+  });
+});