Fix checkstyle errors

Issue gh-1025

Author: jzheaux

test-support/src/test/java/org/springframework/ldap/test/unboundid/EmbeddedLdapServerTest.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2005-2025 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.ldap.test.unboundid;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class EmbeddedLdapServerTests {
+
+	@Test
+	public void shouldStartAndCloseServer() throws Exception {
+		int port = getFreePort();
+		assertThat(isPortOpen(port)).isFalse();
+
+		EmbeddedLdapServer server = EmbeddedLdapServer.newEmbeddedServer("jayway", "dc=jayway,dc=se", port);
+		assertThat(isPortOpen(port)).isTrue();
+
+		server.close();
+		assertThat(isPortOpen(port)).isFalse();
+	}
+
+	@Test
+	public void shouldStartAndAutoCloseServer() throws Exception {
+		int port = getFreePort();
+		assertThat(isPortOpen(port)).isFalse();
+
+		try (EmbeddedLdapServer ignored = EmbeddedLdapServer.newEmbeddedServer("jayway", "dc=jayway,dc=se", port)) {
+			assertThat(isPortOpen(port)).isTrue();
+		}
+		assertThat(isPortOpen(port)).isFalse();
+	}
+
+	@Test
+	public void shouldStartAndCloseServerViaLdapTestUtils() throws Exception {
+		int port = getFreePort();
+		assertThat(isPortOpen(port)).isFalse();
+
+		LdapTestUtils.startEmbeddedServer(port, "dc=jayway,dc=se", "jayway");
+		assertThat(isPortOpen(port)).isTrue();
+
+		LdapTestUtils.shutdownEmbeddedServer();
+		assertThat(isPortOpen(port)).isFalse();
+	}
+
+	static boolean isPortOpen(int port) {
+		try (Socket ignored = new Socket("localhost", port)) {
+			return true;
+		}
+		catch (IOException ex) {
+			return false;
+		}
+	}
+
+	static int getFreePort() throws IOException {
+		try (ServerSocket serverSocket = new ServerSocket(0)) {
+			return serverSocket.getLocalPort();
+		}
+	}
+
+}