Manage EmbeddedWebServer in ReactiveWebApplicationContext

This commit adds an `EmbeddedWebServer` instance to the
`ReactiveWebApplicationContext` and ties it to the application
lifecycle.

To launch a reactive web application, two elements are required
from the context:

* a `ReactiveWebServerFactory` to create a server instance
* a `HttpHandler` instance to handle HTTP requests

Closes gh-8337

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnNotWebApplicationTests.java

@@ -18,12 +18,16 @@ package org.springframework.boot.autoconfigure.condition;
 
 import org.junit.After;
 import org.junit.Test;
+import reactor.core.publisher.Mono;
 
+import org.springframework.boot.autoconfigure.webflux.MockReactiveWebServerFactory;
 import org.springframework.boot.context.embedded.ReactiveWebApplicationContext;
+import org.springframework.boot.context.embedded.ReactiveWebServerFactory;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.reactive.HttpHandler;
 import org.springframework.mock.web.MockServletContext;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 
@@ -33,7 +37,7 @@ import static org.assertj.core.api.Assertions.entry;
 /**
  * Tests for {@link ConditionalOnNotWebApplication}.
  *
- * @author Dave Syer$
+ * @author Dave Syer
  * @author Stephane Nicoll
  */
 public class ConditionalOnNotWebApplicationTests {
@@ -61,7 +65,7 @@ public class ConditionalOnNotWebApplicationTests {
 	@Test
 	public void testNotWebApplicationWithReactiveContext() {
 		ReactiveWebApplicationContext ctx = new ReactiveWebApplicationContext();
-		ctx.register(NotWebApplicationConfiguration.class);
+		ctx.register(ReactiveApplicationConfig.class, NotWebApplicationConfiguration.class);
 		ctx.refresh();
 
 		this.context = ctx;
@@ -79,6 +83,20 @@ public class ConditionalOnNotWebApplicationTests {
 				entry("none", "none"));
 	}
 
+	@Configuration
+	protected static class ReactiveApplicationConfig {
+
+		@Bean
+		public ReactiveWebServerFactory reactiveWebServerFactory() {
+			return new MockReactiveWebServerFactory();
+		}
+
+		@Bean
+		public HttpHandler httpHandler() {
+			return (request, response) -> Mono.empty();
+		}
+	}
+
 	@Configuration
 	@ConditionalOnNotWebApplication
 	protected static class NotWebApplicationConfiguration {

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnWebApplicationTests.java

@@ -18,13 +18,17 @@ package org.springframework.boot.autoconfigure.condition;
 
 import org.junit.After;
 import org.junit.Test;
+import reactor.core.publisher.Mono;
 
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
+import org.springframework.boot.autoconfigure.webflux.MockReactiveWebServerFactory;
 import org.springframework.boot.context.embedded.ReactiveWebApplicationContext;
+import org.springframework.boot.context.embedded.ReactiveWebServerFactory;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.server.reactive.HttpHandler;
 import org.springframework.mock.web.MockServletContext;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 
@@ -118,6 +122,15 @@ public class ConditionalOnWebApplicationTests {
 			return "reactive";
 		}
 
+		@Bean
+		public ReactiveWebServerFactory reactiveWebServerFactory() {
+			return new MockReactiveWebServerFactory();
+		}
+
+		@Bean
+		public HttpHandler httpHandler() {
+			return (request, response) -> Mono.empty();
+		}
 	}
 
 }