test: addStudents method in Administration class

src/test/java/org/example/AdministrationTest.java

@@ -71,6 +71,32 @@ class AdministrationTest {
         assertEquals(student, student2);
     }
 
+    @Test
+    void addStudents() {
+        Administration admin = new Administration();
+
+        // Creating a sample student
+        Student student = new Student("Walter White", "S123456", "Student");
+
+        // Adding the student to the system
+        admin.addStudents(student);
+
+        // Retrieving the added student by ID
+        Student retrievedStudent = admin.findStudentById("S123456");
+
+        // Asserting that the retrieved student is not null
+        assertNotNull(retrievedStudent);
+
+        // Asserting that the retrieved student's name matches the expected name
+        assertEquals("Walter White", retrievedStudent.getName());
+
+        // Asserting that the retrieved student's ID matches the expected ID
+        assertEquals("S123456", retrievedStudent.getId());
+
+        // Asserting that the retrieved student's role matches the expected role
+        assertEquals("Student", retrievedStudent.getRole());
+    }
+
     @Test
     void deleteStudents() {
         Student student1 = new Student("Walter White", "S123456", "Student");
@@ -140,5 +166,4 @@ class AdministrationTest {
         // Finding the added course
         assertEquals(course, admin.findCourseByID("M101"));
     }
-
 }