Add nullability annotations to tests in smoke-test/spring-boot-smoke-test-websocket-tomcat

See gh-47263

smoke-test/spring-boot-smoke-test-websocket-tomcat/build.gradle

@@ -25,3 +25,7 @@ dependencies {
 
 	testImplementation(project(":starter:spring-boot-starter-test"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/SampleWebSocketsApplicationTests.java

@@ -80,6 +80,7 @@ class SampleWebSocketsApplicationTests {
 	static class ClientConfiguration implements CommandLineRunner {
 
 		@Value("${websocket.uri}")
+		@SuppressWarnings("NullAway.Init")
 		private String webSocketUri;
 
 		private final CountDownLatch latch = new CountDownLatch(1);

smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/echo/CustomContainerWebSocketsApplicationTests.java

@@ -95,6 +95,7 @@ class CustomContainerWebSocketsApplicationTests {
 	static class ClientConfiguration implements CommandLineRunner {
 
 		@Value("${websocket.uri}")
+		@SuppressWarnings("NullAway.Init")
 		private String webSocketUri;
 
 		private final CountDownLatch latch = new CountDownLatch(1);