Added code examples from the article.

persistence-modules/spring-persistence-simple/src/test/java/com/baeldung/transactional/TransactionalDetectionTest.java

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+package com.baeldung.transactional;
+
+import com.baeldung.persistence.service.transactional.PersistenceTransactionalTestConfig;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.transaction.support.TransactionSynchronizationManager;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+@ContextConfiguration(classes = PersistenceTransactionalTestConfig.class)
+@RunWith(SpringJUnit4ClassRunner.class)
+public class TransactionalDetectionTest {
+
+    @Test
+    @Transactional
+    public void givenTransactional_whenCheckingForActiveTransaction_thenReceiveTrue() {
+        assertTrue(TransactionSynchronizationManager.isActualTransactionActive());
+    }
+
+    @Test
+    public void givenNoTransactional_whenCheckingForActiveTransaction_thenReceiveFalse() {
+        assertFalse(TransactionSynchronizationManager.isActualTransactionActive());
+    }
+}