[improve] add TimeZoneListener test (#2432)

Signed-off-by: yuluo-yx <[email protected]>
Co-authored-by: tomsun28 <[email protected]>

manager/src/test/java/org/apache/hertzbeat/manager/component/listener/TimeZoneListenerTest.java

@@ -0,0 +1,76 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hertzbeat.manager.component.listener;
+
+import java.text.SimpleDateFormat;
+import java.util.TimeZone;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.hertzbeat.common.support.event.SystemConfigChangeEvent;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * test case for {@link TimeZoneListener}
+ */
+
+@ExtendWith(MockitoExtension.class)
+class TimeZoneListenerTest {
+
+	@Mock
+	private ObjectMapper objectMapper;
+
+	@InjectMocks
+	private TimeZoneListener timeZoneListener;
+
+	@Mock
+	private SystemConfigChangeEvent event;
+
+	@BeforeEach
+	void setUp() {
+
+		ReflectionTestUtils.setField(timeZoneListener, "objectMapper", objectMapper);
+	}
+
+	@Test
+	void testOnEvent() {
+
+		when(objectMapper.setTimeZone(any(TimeZone.class))).thenReturn(objectMapper);
+		when(objectMapper.setDateFormat(any(SimpleDateFormat.class))).thenReturn(objectMapper);
+
+		Object eventSource = new Object();
+		when(event.getSource()).thenReturn(eventSource);
+
+		timeZoneListener.onEvent(event);
+
+		SimpleDateFormat expectedDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSX");
+		expectedDateFormat.setTimeZone(TimeZone.getDefault());
+
+		verify(objectMapper).setTimeZone(TimeZone.getDefault());
+		verify(objectMapper).setDateFormat(expectedDateFormat);
+	}
+
+}