fix: apply throw exception to addStudent tests

Author: AmiyahJo

lesson_16/objects/objects_app/src/test/java/com/codedifferently/lesson16/amiyahjones/JobReadinessProgramTest.java

@@ -8,7 +8,7 @@
 public class JobReadinessProgramTest {
 
     @Test
-    void testAddStudent() {
+    void testAddStudent() throws ClassroomFullException {
         //Arrange
         JobReadinessProgram program = new JobReadinessProgram(null, false, null);
 
@@ -20,7 +20,7 @@ void testAddStudent() {
     }
 
     @Test
-    void testGetStudentCount() {
+    void testGetStudentCount() throws ClassroomFullException {
         //Arrange
         JobReadinessProgram program = new JobReadinessProgram(null, true, null);
         program.addStudent("John");