feat(users,professors): add promote student to professor and full student profile aggregation

components/users/studentProfileAndPromotion.test.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const userService = require('./userService');
+const professorService = require('../professors/professorService');
+
+describe('Student Profile and Professor Promotion Service Exports', () => {
+  it('exports getUserFullProfile and promoteToProfessor in userService', () => {
+    assert.equal(typeof userService.getUserFullProfile, 'function');
+    assert.equal(typeof userService.promoteToProfessor, 'function');
+  });
+
+  it('exports createProfessorFromUser in professorService', () => {
+    assert.equal(typeof professorService.createProfessorFromUser, 'function');
+  });
+
+  it('throws validation error when userId is missing in createProfessorFromUser', async () => {
+    await assert.rejects(
+      () => professorService.createProfessorFromUser(null),
+      (err) => err.errorCode === 'VALIDATION_FAILED' || err.statusCode === 400
+    );
+  });
+});