[Improve] add timezoneutil unit test (#2362)

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

common/src/test/java/org/apache/hertzbeat/common/util/TimeZoneUtilTest.java

@@ -0,0 +1,88 @@
+/*
+ * 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.common.util;
+
+import java.util.Locale;
+import java.util.TimeZone;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * test case for {@link TimeZoneUtil}
+ */
+
+class TimeZoneUtilTest {
+
+	private TimeZone defaultTimeZone;
+	private Locale defaultLocale;
+
+	@BeforeEach
+	void setUp() {
+
+		defaultTimeZone = TimeZone.getDefault();
+		defaultLocale = Locale.getDefault();
+	}
+
+	@AfterEach
+	void tearDown() {
+
+		TimeZone.setDefault(defaultTimeZone);
+		Locale.setDefault(defaultLocale);
+	}
+
+	@Test
+	void testSetTimeZoneAndLocale() {
+
+		TimeZoneUtil.setTimeZoneAndLocale("America/New_York", "en_US");
+		assertEquals("America/New_York", TimeZone.getDefault().getID());
+		assertEquals(new Locale("en", "US"), Locale.getDefault());
+	}
+
+	@Test
+	void testSetTimeZone() {
+
+		TimeZoneUtil.setTimeZone("Asia/Tokyo");
+		assertEquals("Asia/Tokyo", TimeZone.getDefault().getID());
+
+
+		TimeZoneUtil.setTimeZone("");
+		assertEquals("Asia/Tokyo", TimeZone.getDefault().getID());
+
+		TimeZoneUtil.setTimeZone(null);
+		assertEquals("Asia/Tokyo", TimeZone.getDefault().getID());
+	}
+
+	@Test
+	void testSetLocale() {
+
+		TimeZoneUtil.setLocale("fr_FR");
+		assertEquals(new Locale("fr", "FR"), Locale.getDefault());
+
+
+		TimeZoneUtil.setLocale("");
+		assertEquals(new Locale("fr", "FR"), Locale.getDefault());
+
+		TimeZoneUtil.setLocale(null);
+		assertEquals(new Locale("fr", "FR"), Locale.getDefault());
+	}
+
+}