test: findCourseByID method in Administration class

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

@@ -94,4 +94,15 @@ class AdministrationTest {
         assertNull(administration.findCourseByID("M101"));
     }
 
+    @Test
+    public void testFindCourseByID() {
+        Administration administration = new Administration();
+        // Adding a course
+        Course course = new Course("Math", "M101", 4);
+        administration.addCourse(course);
+
+        // Finding the added course
+        assertEquals(course, administration.findCourseByID("M101"));
+    }
+
 }