diff --git a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerBackgroundTests.java b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerBackgroundTests.java
index f5e090d31..98d78e688 100644
--- a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerBackgroundTests.java
+++ b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/FunctionInvokerBackgroundTests.java
@@ -47,6 +47,9 @@ public class FunctionInvokerBackgroundTests {
 
 	private static final Gson gson = new Gson();
 
+	/**
+	 * The rule for log.
+	 */
 	@Rule
 	public final SystemOutRule systemOutRule = new SystemOutRule().enableLog();
 
diff --git a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/integration/LocalServerTestSupport.java b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/integration/LocalServerTestSupport.java
index ef17f5a49..63af7f8d9 100644
--- a/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/integration/LocalServerTestSupport.java
+++ b/spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/test/java/org/springframework/cloud/function/adapter/gcp/integration/LocalServerTestSupport.java
@@ -51,7 +51,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Daniel Zou
  * @author Mike Eltsufin
  */
-public class LocalServerTestSupport {
+final public class LocalServerTestSupport {
 
 	private static final Gson gson = new Gson();
 
@@ -61,8 +61,11 @@ public class LocalServerTestSupport {
 
 	private static AtomicInteger nextPort = new AtomicInteger(8080);
 
+	private LocalServerTestSupport() {
+	}
+
 	/**
-	 * Starts up the Cloud Function Server and executes the test
+	 * Starts up the Cloud Function Server and executes the test.
 	 */
 	public static <I, O> void verify(Class<?> mainClass, String function, I input, O expectedOutput) {
 		try (ServerProcess serverProcess = LocalServerTestSupport.startServer(mainClass, function)) {