Added a test to model checking.

Solved some problems.

elide-core/src/test/java/com/yahoo/elide/core/utils/ClassScannerTest.java

@@ -5,16 +5,15 @@
  */
 package com.yahoo.elide.core.utils;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-
 import com.yahoo.elide.annotation.Include;
 import org.junit.jupiter.api.Test;
 
 import jakarta.persistence.Entity;
 
 import java.util.Set;
 
+import static org.junit.jupiter.api.Assertions.*;
+
 public class ClassScannerTest {
 
     private final ClassScanner scanner;
@@ -53,4 +52,11 @@ public void testGetAnyAnnotatedClasses() {
                     || cls.isAnnotationPresent(Entity.class));
         }
     }
+
+    @Test
+    public void testGetAnnotatedClassesNoClassesFound() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            scanner.getAnnotatedClasses("nonexistent.package", Include.class);
+        }, "No annotated classes found in the specified package: nonexistent.package");
+    }
 }