From 4fb73acceb499b43b7fe3147a4588e27f9ac8dd4 Mon Sep 17 00:00:00 2001
From: aitestmate <ai_testmate@epam.com>
Date: Tue, 7 Jul 2026 09:59:48 +0000
Subject: [PATCH] [chore] [mod-dcb] unit tests

---
 .../TransactionAuditEntityListenerTest.java   | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/test/java/org/folio/dcb/repository/listener/TransactionAuditEntityListenerTest.java

diff --git a/src/test/java/org/folio/dcb/repository/listener/TransactionAuditEntityListenerTest.java b/src/test/java/org/folio/dcb/repository/listener/TransactionAuditEntityListenerTest.java
new file mode 100644
index 00000000..580ee05e
--- /dev/null
+++ b/src/test/java/org/folio/dcb/repository/listener/TransactionAuditEntityListenerTest.java
@@ -0,0 +1,81 @@
+package org.folio.dcb.repository.listener;
+
+import jakarta.persistence.EntityManager;
+import org.folio.dcb.support.types.UnitTest;
+import org.folio.dcb.utils.BeanUtil;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import tools.jackson.databind.ObjectMapper;
+import org.folio.dcb.domain.entity.TransactionAuditEntity;
+import org.folio.dcb.domain.entity.TransactionEntity;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+import tools.jackson.core.JacksonException;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+
+@UnitTest
+@ExtendWith(MockitoExtension.class)
+class TransactionAuditEntityListenerTest {
+
+  @InjectMocks
+  private TransactionAuditEntityListener transactionAuditEntityListener;
+
+  @Mock
+  private BeanUtil beanUtil;
+
+  @Mock
+  private ObjectMapper objectMapper;
+
+  @Mock
+  private EntityManager entityManager;
+
+    @Test
+  void onPrePersistShouldCreateAndPersistAuditRecord() throws JacksonException {
+    // TestMate-bf56de4ad8708b9afd2934004879a737
+    // Given
+    String transactionId = "tx-123";
+    String expectedJson = "{\"id\":\"tx-123\"}";
+    TransactionEntity transactionEntity = TransactionEntity.builder()
+      .id(transactionId)
+      .build();
+    when(beanUtil.getBean(EntityManager.class)).thenReturn(entityManager);
+    when(objectMapper.writeValueAsString(transactionEntity)).thenReturn(expectedJson);
+    // When
+    transactionAuditEntityListener.onPrePersist(transactionEntity);
+    // Then
+    ArgumentCaptor<TransactionAuditEntity> auditCaptor = ArgumentCaptor.forClass(TransactionAuditEntity.class);
+    verify(entityManager).persist(auditCaptor.capture());
+    TransactionAuditEntity capturedAudit = auditCaptor.getValue();
+    assertThat(capturedAudit.getAction()).isEqualTo("CREATE");
+    assertThat(capturedAudit.getTransactionId()).isEqualTo(transactionId);
+    assertThat(capturedAudit.getBefore()).isNull();
+    assertThat(capturedAudit.getAfter()).isEqualTo(expectedJson);
+  }
+
+    @Test
+  void onPrePersistShouldPropagateJacksonExceptionWhenSerializationFails() throws JacksonException {
+    // TestMate-cef71670364a044a6369cb627a4e6f24
+    // Given
+    String transactionId = "tx-failure-123";
+    TransactionEntity transactionEntity = TransactionEntity.builder()
+      .id(transactionId)
+      .build();
+    JacksonException jacksonException = mock(JacksonException.class);
+    // The call to getEntityManager() (which uses beanUtil) happens after writeValueAsString.
+    // If writeValueAsString throws an exception, beanUtil is never invoked, making the stubbing unnecessary.
+    when(objectMapper.writeValueAsString(transactionEntity)).thenThrow(jacksonException);
+    // When
+    assertThrows(JacksonException.class, () -> transactionAuditEntityListener.onPrePersist(transactionEntity));
+    // Then
+    verify(entityManager, never()).persist(any());
+  }
+
+}