fix: Fix test stability issues

single-table-inheritance/src/main/java/com/iluwatar/SingleTableInheritance.java

@@ -67,7 +67,12 @@ public class SingleTableInheritance implements CommandLineRunner {
    * @param args program runtime arguments
    */
   public static void main(String[] args) {
-    SpringApplication.run(SingleTableInheritance.class, args);
+    var context = SpringApplication.run(SingleTableInheritance.class, args);
+    if (args.length > 0 && "test".equals(args[0])) {
+      // Close the context immediately during tests to prevent Tomcat/background threads from
+      // hanging the JVM
+      context.close();
+    }
   }
 
   /**

single-table-inheritance/src/test/java/com/iluwatar/SingleTableInheritanceTest.java

@@ -33,6 +33,6 @@ class SingleTableInheritanceTest {
 
   @Test
   void shouldExecuteWithoutException() {
-    assertDoesNotThrow(() -> SingleTableInheritance.main(new String[] {}));
+    assertDoesNotThrow(() -> SingleTableInheritance.main(new String[] {"test"}));
   }
 }