test: deleteStudent method in Administration class

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

@@ -71,6 +71,34 @@ class AdministrationTest {
         assertEquals(student, student2);
     }
 
+    @Test
+    void deleteStudents() {
+        Student student1 = new Student("Walter White", "S123456", "Student");
+        Student student2 = new Student("Jesse Pinkmann", "S789012", "Student");
+
+        // Add students to the administration
+        admin.addStudents(student1);
+        admin.addStudents(student2);
+
+        // Delete a student (student1)
+        boolean deleted = admin.deleteStudents("S123456");
+
+        // Check if the student is deleted successfully
+        assertTrue(deleted);
+
+        // Check if the student is no longer in the system
+        assertNull(admin.findStudentById("S123456"));
+
+        // Check if the other student (student2) still exists in the system
+        assertNotNull(admin.findStudentById("S789012"));
+
+        // Attempt to delete a non-existing student
+        boolean nonExistingStudentDeleted = admin.deleteStudents("S999999");
+
+        // Check if the deletion of non-existing student returns false
+        assertFalse(nonExistingStudentDeleted);
+    }
+
     /**
      * Test case for the addCourse method.
      * Adds a course to the Administration instance and checks if it can be found by its ID.