INT-1188, Added support for MAC address discovery to ensure Global uniqueness of UUID

spring-integration-core/src/test/java/org/springframework/integration/core/TimeBasedUUIDGeneratorTests.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2002-2010 the original author or authors.
+ *
+ * Licensed 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.springframework.integration.core;
+
+import java.util.UUID;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * @author Oleg Zhurakousky
+ *
+ */
+public class TimeBasedUUIDGeneratorTests {
+
+	@Test
+	public void testGreaterThen(){
+		UUID id = TimeBasedUUIDGenerator.generateId();
+		for (int i = 0; i < 1000; i++) {
+			UUID newId = TimeBasedUUIDGenerator.generateId();
+			// tests, that newly created UUID is always greater then the previous one.
+			Assert.assertTrue(newId.compareTo(id) == 1);
+			id = newId;
+		}
+	}
+	@Test
+	public void testUniqueness(){
+		long timestamp = System.currentTimeMillis();
+		UUID id = TimeBasedUUIDGenerator.generateIdFromTimestamp(timestamp);
+		for (int i = 0; i < 1000; i++) {
+			UUID newId = TimeBasedUUIDGenerator.generateIdFromTimestamp(timestamp);
+			// tests, that newly created UUID is always greater then the previous one.
+			Assert.assertTrue(newId.compareTo(id) == 1);
+			id = newId;
+		}
+	}
+}