Remove start/stop integration test

This test is not useful in this context.

Closes gh-9889

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

@@ -22,7 +22,6 @@ import org.junit.Test;
 import org.junit.rules.ExpectedException;
 import org.junit.rules.TemporaryFolder;
 import reactor.core.publisher.Mono;
-import reactor.test.StepVerifier;
 
 import org.springframework.boot.testsupport.rule.OutputCapture;
 import org.springframework.boot.web.server.WebServer;
@@ -33,7 +32,6 @@ import org.springframework.http.server.reactive.ServerHttpRequest;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.SocketUtils;
 import org.springframework.web.reactive.function.BodyInserters;
-import org.springframework.web.reactive.function.client.ClientResponse;
 import org.springframework.web.reactive.function.client.WebClient;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -70,23 +68,6 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 
 	protected abstract AbstractReactiveWebServerFactory getFactory();
 
-	@Test
-	public void startStopServer() {
-		this.webServer = getFactory().getWebServer(new EchoHandler());
-		this.webServer.start();
-		assertThat(this.output.toString()).contains("started on port");
-		Mono<String> result = getWebClient().post().uri("/test")
-				.contentType(MediaType.TEXT_PLAIN)
-				.body(BodyInserters.fromObject("Hello World")).exchange()
-				.flatMap((response) -> response.bodyToMono(String.class));
-		assertThat(result.block()).isEqualTo("Hello World");
-		this.webServer.stop();
-		Mono<ClientResponse> response = getWebClient().post().uri("/test")
-				.contentType(MediaType.TEXT_PLAIN)
-				.body(BodyInserters.fromObject("Hello World")).exchange();
-		StepVerifier.create(response).expectError().verify();
-	}
-
 	@Test
 	public void specificPort() throws Exception {
 		AbstractReactiveWebServerFactory factory = getFactory();