chore(school): add error if user is not a student in StudentAdapter

schoolData/src/main/kotlin/com/intelligentbackpack/schooldata/adapter/StudentAdapter.kt

@@ -1,5 +1,6 @@
 package com.intelligentbackpack.schooldata.adapter
 
+import com.intelligentbackpack.accessdomain.entities.Role
 import com.intelligentbackpack.accessdomain.entities.User
 import com.intelligentbackpack.schooldomain.entities.person.Student
 
@@ -9,15 +10,19 @@ import com.intelligentbackpack.schooldomain.entities.person.Student
 object StudentAdapter {
 
     /**
-     * Converts a student from the access to the domain.
+     * Converts a user from the access to student of the school domain.
      *
      * @return the student for the domain.
      */
     fun User.fromAccessToSchool(): Student {
-        return Student.create(
-            email = email,
-            name = name,
-            surname = surname,
-        )
+        return if (this.role == Role.STUDENT) {
+            Student.create(
+                email = email,
+                name = name,
+                surname = surname,
+            )
+        } else {
+            throw IllegalArgumentException("The user role is not valid.")
+        }
     }
 }