test(user): verify username schema constraints (JhaSourav07#946)

* test(user): verify username schema constraints

* chore: remove pnpm lock and workspace files

Author: sandesh-861

models/User.test.ts

@@ -1,3 +1,4 @@
+import mongoose from 'mongoose';
 import { describe, it, expect } from 'vitest';
 import { User } from './User';
 
@@ -6,4 +7,34 @@ describe('User Model', () => {
     expect(User).toBeDefined();
     expect(User.modelName).toBe('User');
   });
+
+  describe('username schema constraints', () => {
+    it('has lowercase: true on username path', () => {
+      const usernamePath = User.schema.path('username') as mongoose.SchemaType & {
+        options: Record<string, unknown>;
+      };
+      expect(usernamePath.options.lowercase).toBe(true);
+    });
+
+    it('has trim: true on username path', () => {
+      const usernamePath = User.schema.path('username') as mongoose.SchemaType & {
+        options: Record<string, unknown>;
+      };
+      expect(usernamePath.options.trim).toBe(true);
+    });
+
+    it('has unique: true on username path', () => {
+      const usernamePath = User.schema.path('username') as mongoose.SchemaType & {
+        options: Record<string, unknown>;
+      };
+      expect(usernamePath.options.unique).toBe(true);
+    });
+
+    it('has required: true on username path', () => {
+      const usernamePath = User.schema.path('username') as mongoose.SchemaType & {
+        options: Record<string, unknown>;
+      };
+      expect(usernamePath.options.required).toBe(true);
+    });
+  });
 });