Start a reactive web application if necessary

This commit makes sure that `@SpringBootTest` with a reactive setup
starts a web application if necessary.

If both a servlet and a reactive environment are available, a servlet
environment is bootstraped. This commit also adds a way to force a
reactive environment by specifying the `spring.main.web-application-type`
property of the test (e.g. `@TestPropertySource`).

Closes gh-8383

spring-boot-test/src/test/java/org/springframework/boot/test/context/AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.context;
+
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.embedded.LocalServerPort;
+import org.springframework.boot.context.embedded.ReactiveWebApplicationContext;
+import org.springframework.boot.context.embedded.ReactiveWebServerFactory;
+import org.springframework.boot.context.embedded.tomcat.TomcatReactiveWebServerFactory;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+import org.springframework.http.server.reactive.HttpHandler;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Base class for {@link SpringBootTest} tests configured to start an embedded reactive
+ * container.
+ *
+ * @author Stephane Nicoll
+ */
+public abstract class AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests {
+
+	@LocalServerPort
+	private int port = 0;
+
+	@Value("${value}")
+	private int value = 0;
+
+	@Autowired
+	private ReactiveWebApplicationContext context;
+
+	public ReactiveWebApplicationContext getContext() {
+		return this.context;
+	}
+
+	@Test
+	public void runAndTestHttpEndpoint() {
+		assertThat(this.port).isNotEqualTo(8080).isNotEqualTo(0);
+		String body = new RestTemplate()
+				.getForObject("http://localhost:" + this.port + "/", String.class);
+		assertThat(body).isEqualTo("Hello World");
+	}
+
+	@Test
+	public void annotationAttributesOverridePropertiesFile() throws Exception {
+		assertThat(this.value).isEqualTo(123);
+	}
+
+	protected static class AbstractConfig {
+
+		@Value("${server.port:8080}")
+		private int port = 8080;
+
+		@Bean
+		public HttpHandler httpHandler(ApplicationContext applicationContext) {
+			return WebHttpHandlerBuilder.applicationContext(applicationContext).build();
+		}
+
+		@Bean
+		public ReactiveWebServerFactory embeddedReactiveContainer() {
+			TomcatReactiveWebServerFactory factory = new TomcatReactiveWebServerFactory();
+			factory.setPort(this.port);
+			return factory;
+		}
+
+		@Bean
+		public static PropertySourcesPlaceholderConfigurer propertyPlaceholder() {
+			return new PropertySourcesPlaceholderConfigurer();
+		}
+
+		@RequestMapping("/")
+		public Mono<String> home() {
+			return Mono.just("Hello World");
+		}
+
+	}
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/AbstractSpringBootTestEmbeddedServletWebEnvironmentTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Phillip Webb
  * @author Andy Wilkinson
  */
-public abstract class AbstractSpringBootTestEmbeddedWebEnvironmentTests {
+public abstract class AbstractSpringBootTestEmbeddedServletWebEnvironmentTests {
 
 	@LocalServerPort
 	private int port = 0;

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestReactiveWebEnvironmentDefinedPortTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.context;
+
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.reactive.config.EnableWebFlux;
+
+/**
+ * Tests for {@link SpringBootTest} in a reactive environment configured
+ * with {@link WebEnvironment#DEFINED_PORT}.
+ *
+ * @author Stephane Nicoll
+ */
+@RunWith(SpringRunner.class)
+@DirtiesContext
+@SpringBootTest(webEnvironment = WebEnvironment.DEFINED_PORT, properties = {
+		"spring.main.web-application-type=reactive", "server.port=0", "value=123" })
+public class SpringBootTestReactiveWebEnvironmentDefinedPortTests
+		extends AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests {
+
+	@Configuration
+	@EnableWebFlux
+	@RestController
+	protected static class Config extends AbstractConfig {
+
+	}
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestReactiveWebEnvironmentRandomPortTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.context;
+
+import org.junit.runner.RunWith;
+
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.test.annotation.DirtiesContext;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.reactive.config.EnableWebFlux;
+
+/**
+ * Tests for {@link SpringBootTest} in a reactive environment configured
+ * with {@link WebEnvironment#RANDOM_PORT}.
+ *
+ * @author Stephane Nicoll
+ */
+@RunWith(SpringRunner.class)
+@DirtiesContext
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, properties = {
+		"spring.main.webApplicationType=reactive", "value=123" })
+public class SpringBootTestReactiveWebEnvironmentRandomPortTests
+		extends AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests {
+
+	@Configuration
+	@EnableWebFlux
+	@RestController
+	protected static class Config extends AbstractConfig {
+
+	}
+
+}

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestTestRestTemplateDefinedByUser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,7 +40,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @DirtiesContext
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, properties = { "value=123" })
 public class SpringBootTestTestRestTemplateDefinedByUser
-		extends AbstractSpringBootTestEmbeddedWebEnvironmentTests {
+		extends AbstractSpringBootTestEmbeddedServletWebEnvironmentTests {
 
 	@Test
 	public void restTemplateIsUserDefined() throws Exception {

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentDefinedPortTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,7 +36,7 @@ import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 @SpringBootTest(webEnvironment = WebEnvironment.DEFINED_PORT, properties = {
 		"server.port=0", "value=123" })
 public class SpringBootTestWebEnvironmentDefinedPortTests
-		extends AbstractSpringBootTestEmbeddedWebEnvironmentTests {
+		extends AbstractSpringBootTestEmbeddedServletWebEnvironmentTests {
 
 	@Configuration
 	@EnableWebMvc

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentRandomPortCustomPortTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.context.AbstractSpringBootTestEmbeddedWebEnvironmentTests.AbstractConfig;
+import org.springframework.boot.test.context.AbstractSpringBootTestEmbeddedServletWebEnvironmentTests.AbstractConfig;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;

spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentRandomPortTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 @DirtiesContext
 @SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, properties = { "value=123" })
 public class SpringBootTestWebEnvironmentRandomPortTests
-		extends AbstractSpringBootTestEmbeddedWebEnvironmentTests {
+		extends AbstractSpringBootTestEmbeddedServletWebEnvironmentTests {
 
 	@Test
 	public void testRestTemplateShouldUseBuilder() throws Exception {