test(models): verify createdAt default is callable and returns timestamp

Author: vaibhav051422-collab

models/User.test.ts

@@ -16,6 +16,21 @@ describe('User Model', () => {
       expect(usernamePath.options.lowercase).toBe(true);
     });
 
+    describe('createdAt schema', () => {
+      it('uses a callable default that returns a timestamp', () => {
+        const createdAtPath = User.schema.path('createdAt') as mongoose.SchemaType & {
+          options: { default?: unknown };
+        };
+
+        // Assertion 1: the default is a function
+        expect(typeof createdAtPath.options.default).toBe('function');
+
+        // Assertion 2: calling the default returns a numeric timestamp
+        const result = (createdAtPath.options.default as () => number)();
+        expect(typeof result).toBe('number');
+        expect(Number.isFinite(result)).toBe(true);
+      });
+    });
     it('has trim: true on username path', () => {
       const usernamePath = User.schema.path('username') as mongoose.SchemaType & {
         options: Record<string, unknown>;