Add utility method to find and reserve allocated network ports.

spring-data-geode-test/src/test/java/org/springframework/data/gemfire/tests/integration/ClientServerIntegrationTestsSupportTests.java

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+/*
+ *  Copyright 2019 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
+ *
+ *       https://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.data.gemfire.tests.integration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.junit.Test;
+
+/**
+ * Integration Tests for {@link ClientServerIntegrationTestsSupport}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.springframework.data.gemfire.tests.integration.ClientServerIntegrationTests
+ * @since 0.0.14.RELEASE
+ */
+public class ClientServerIntegrationTestsSupportTests extends ClientServerIntegrationTestsSupport {
+
+	@Test
+	public void allocatedPortsAreDifferent() throws IOException {
+
+		int expectedSize = 3;
+
+		Set<Integer> allocatedPorts = new HashSet<>();
+
+		for (int index = 0; index < expectedSize; index++) {
+			allocatedPorts.add(findAndReserveAvailablePort());
+		}
+
+		assertThat(allocatedPorts).hasSize(expectedSize);
+	}
+}