INT-2564 Move Some SocketTestUtils to Test Module

Move SocketTestUtils.findAvailableServerSocket to Test Module

For reference see: https://jira.springsource.org/browse/INT-2564

* Move SocketTestUtils.findAvailableServerSocket to Spring Integration Test Module
* Fix tests

spring-integration-test/src/test/java/org/springframework/integration/test/util/SocketUtilsTests.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2002-2012 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.test.util;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+
+/**
+ * @author Gunnar Hillert
+ */
+public class SocketUtilsTests {
+
+	@Test
+	public void testFindAvailableServerSocketWithNegativeSeedPort() {
+
+		try {
+			SocketUtils.findAvailableServerSocket(-500);
+		}
+		catch (IllegalArgumentException e) {
+			Assert.assertEquals("'seed' must not be negative", e.getMessage());
+			return;
+
+		}
+
+		Assert.fail("Expected an IllegalArgumentException to be thrown.");
+	}
+
+	@Test
+	public void testFindAvailableUdpSocketWithNegativeSeedPort() {
+
+		try {
+			SocketUtils.findAvailableUdpSocket(-500);
+		}
+		catch (IllegalArgumentException e) {
+			Assert.assertEquals("'seed' must not be negative", e.getMessage());
+			return;
+
+		}
+
+		Assert.fail("Expected an IllegalArgumentException to be thrown.");
+	}
+
+}