Added test for findStudentById Method for Administration class

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

@@ -20,4 +20,16 @@ class AdministrationTest {
 
 
     }
+@org.junit.jupiter.api.Test
+
+    void findStudentById(){
+        Administration administration = new Administration();
+        Student student = new Student("Mark", "S1001", "Student");
+
+        administration.addStudents(student);
+
+        Student student2 = administration.findStudentById("S1001");
+        assertEquals(student, student2);
+    }
+
 }