Move port in use exception test as it does not apply to Tomcat

See gh-8737

spring-boot/src/test/java/org/springframework/boot/web/embedded/netty/NettyReactiveWebServerFactoryTests.java

@@ -16,8 +16,13 @@
 
 package org.springframework.boot.web.embedded.netty;
 
+import org.junit.Test;
+
 import org.springframework.boot.web.reactive.server.AbstractReactiveWebServerFactory;
 import org.springframework.boot.web.reactive.server.AbstractReactiveWebServerFactoryTests;
+import org.springframework.boot.web.server.PortInUseException;
+
+import static org.hamcrest.Matchers.equalTo;
 
 /**
  * Tests for {@link NettyReactiveWebServerFactory}.
@@ -32,4 +37,17 @@ public class NettyReactiveWebServerFactoryTests
 		return new NettyReactiveWebServerFactory(0);
 	}
 
+	@Test
+	public void portInUseExceptionIsThrownWhenPortIsAlreadyInUse() throws Exception {
+		AbstractReactiveWebServerFactory factory = getFactory();
+		factory.setPort(0);
+		this.webServer = factory.getWebServer(new EchoHandler());
+		this.webServer.start();
+		factory.setPort(this.webServer.getPort());
+		this.thrown.expect(PortInUseException.class);
+		this.thrown.expectMessage(
+				equalTo("Port " + this.webServer.getPort() + " is already in use"));
+		factory.getWebServer(new EchoHandler()).start();
+	}
+
 }

spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -25,7 +25,6 @@ import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 
 import org.springframework.boot.testsupport.rule.OutputCapture;
-import org.springframework.boot.web.server.PortInUseException;
 import org.springframework.boot.web.server.WebServer;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
@@ -38,7 +37,6 @@ import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.WebClient;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.hamcrest.Matchers.equalTo;
 
 /**
  * Base for testing classes that extends {@link AbstractReactiveWebServerFactory}.
@@ -104,29 +102,22 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 		assertThat(this.webServer.getPort()).isEqualTo(specificPort);
 	}
 
-	@Test
-	public void portInUseExceptionIsThrownWhenPortIsAlreadyInUse() throws Exception {
-		AbstractReactiveWebServerFactory factory = getFactory();
-		factory.setPort(0);
-		this.webServer = factory.getWebServer(new EchoHandler());
-		this.webServer.start();
-		factory.setPort(this.webServer.getPort());
-		this.thrown.expect(PortInUseException.class);
-		this.thrown.expectMessage(
-				equalTo("Port " + this.webServer.getPort() + " is already in use"));
-		factory.getWebServer(new EchoHandler()).start();
-	}
-
 	protected WebClient getWebClient() {
 		return WebClient.create("http://localhost:" + this.webServer.getPort());
 	}
 
 	protected static class EchoHandler implements HttpHandler {
+
+		public EchoHandler() {
+
+		}
+
 		@Override
 		public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response) {
 			response.setStatusCode(HttpStatus.OK);
 			return response.writeWith(request.getBody());
 		}
+
 	}
 
 }