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

See gh-47263

smoke-test/spring-boot-smoke-test-tomcat-multi-connectors/build.gradle

@@ -27,3 +27,7 @@ dependencies {
 	testImplementation(project(":starter:spring-boot-starter-webmvc-test"))
 	testImplementation("org.apache.httpcomponents.client5:httpclient5")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-tomcat-multi-connectors/src/test/java/smoketest/tomcat/multiconnector/SampleTomcatTwoConnectorsApplicationTests.java

@@ -30,6 +30,7 @@ import org.springframework.boot.test.context.TestConfiguration;
 import org.springframework.boot.test.web.server.LocalServerPort;
 import org.springframework.boot.tomcat.TomcatWebServer;
 import org.springframework.boot.web.server.AbstractConfigurableWebServerFactory;
+import org.springframework.boot.web.server.Ssl;
 import org.springframework.boot.web.server.context.WebServerInitializedEvent;
 import org.springframework.context.ApplicationListener;
 import org.springframework.context.annotation.Import;
@@ -63,7 +64,9 @@ class SampleTomcatTwoConnectorsApplicationTests {
 
 	@Test
 	void testSsl() {
-		assertThat(this.webServerFactory.getSsl().isEnabled()).isTrue();
+		Ssl ssl = this.webServerFactory.getSsl();
+		assertThat(ssl).isNotNull();
+		assertThat(ssl.isEnabled()).isTrue();
 	}
 
 	@Test