No need for atomic reference

Author: Christoph Läubrich

platform-tests/src/test/java/org/junit/platform/reporting/open/xml/OpenTestReportGeneratingListenerTests.java

@@ -328,7 +328,7 @@ void writesXmlReportToSocket(@TempDir Path tempDirectory) throws Exception {
 		});
 
 		// Start a server socket to receive the XML
-		var xmlContent = new AtomicReference<String>();
+		var builder = new StringBuilder();
 		var latch = new CountDownLatch(1);
 
 		try (var serverSocket = new ServerSocket(0, 50, InetAddress.getLoopbackAddress())) { // Use any available port
@@ -339,12 +339,10 @@ void writesXmlReportToSocket(@TempDir Path tempDirectory) throws Exception {
 				try (Socket clientSocket = serverSocket.accept();
 						var reader = new BufferedReader(
 							new InputStreamReader(clientSocket.getInputStream(), StandardCharsets.UTF_8))) {
-					var builder = new StringBuilder();
 					String line;
 					while ((line = reader.readLine()) != null) {
 						builder.append(line).append("\n");
 					}
-					xmlContent.set(builder.toString());
 				}
 				catch (Exception e) {
 					fail(e);
@@ -364,7 +362,7 @@ void writesXmlReportToSocket(@TempDir Path tempDirectory) throws Exception {
 			assertThat(serverThread.join(Duration.ofSeconds(10))).isTrue();
 
 			// Verify XML was received
-			assertThat(xmlContent.get()) //
+			assertThat(builder.toString()) //
 					.isNotNull() //
 					.contains("<e:events") //
 					.contains("dummy") //