refactoring: extracting sampleStudents in AdministrationTest file

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

@@ -8,6 +8,8 @@ class AdministrationTest {
 
     Administration admin = new Administration();
     private static final Course sampleCourse = new Course("Math", "M101", 4);
+    private static final Student sampleStudent = new Student("Walter White", "S123456", "Student");
+    private static final Student sampleStudent2 = new Student("Jesse Pinkman", "S789012", "Student");
 
     // Test the findProfessorById Method
     @Test
@@ -112,7 +114,7 @@ class AdministrationTest {
     @Test
     void addStudents() {
         // Creating a sample student
-        Student student = new Student("Walter White", "S123456", "Student");
+        Student student = sampleStudent;
 
         // Adding the student to the system
         admin.addStudents(student);
@@ -139,8 +141,8 @@ class AdministrationTest {
      */
     @Test
     void deleteStudents() {
-        Student student1 = new Student("Walter White", "S123456", "Student");
-        Student student2 = new Student("Jesse Pinkmann", "S789012", "Student");
+        Student student1 = sampleStudent;
+        Student student2 = sampleStudent2;
 
         // Add students to the administration
         admin.addStudents(student1);