Ensure that webEnvironment=NONE creates non-web context

Previously, if spring.main.web-application-type was configured in
application.properties to servlet or reactive, setting
webEnvironment=NONE on @SpringBootTest would not work correctly and
a servlet or reactive web application context would be created
based on the value of spring.main.web-application-type.

This commit updates the test context bootstapper to set
spring.main.web-application-type to none when webEnvironment has been
set to none. This is done in the merged context configuration's
property source properties which are applied to the environment in a
high-precedence test property source that will override configuration
in application.properties.

Closes gh-29695

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/SpringBootTestContextBootstrapper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 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.
@@ -293,9 +293,13 @@ public class SpringBootTestContextBootstrapper extends DefaultTestContextBootstr
 			// precedence
 			propertySourceProperties.addAll(0, Arrays.asList(properties));
 		}
-		if (getWebEnvironment(testClass) == WebEnvironment.RANDOM_PORT) {
+		WebEnvironment webEnvironment = getWebEnvironment(testClass);
+		if (webEnvironment == WebEnvironment.RANDOM_PORT) {
 			propertySourceProperties.add("server.port=0");
 		}
+		else if (webEnvironment == WebEnvironment.NONE) {
+			propertySourceProperties.add("spring.main.web-application-type=none");
+		}
 	}
 
 	/**

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-profile/src/test/java/smoketest/profile/ActiveProfilesTests.java

@@ -33,8 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Madhura Bhave
  */
-@SpringBootTest(webEnvironment = WebEnvironment.NONE,
-		properties = { "enableEnvironmentPostProcessor=true", "server.port=0" }) // gh-28530
+@SpringBootTest(webEnvironment = WebEnvironment.NONE, properties = { "enableEnvironmentPostProcessor=true" }) // gh-28530
 @ActiveProfiles("hello")
 class ActiveProfilesTests {
 

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/build.gradle

@@ -0,0 +1,13 @@
+plugins {
+	id "java"
+	id "org.springframework.boot.conventions"
+}
+
+description = "Spring Boot web application type smoke test"
+
+dependencies {
+	implementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-web"))
+	implementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-webflux"))
+
+	testImplementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-test"))
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/src/main/java/smoketest/webapplicationtype/SampleWebApplicationTypeApplication.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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 smoketest.webapplicationtype;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SampleWebApplicationTypeApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleWebApplicationTypeApplication.class, args);
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.main.web-application-type=reactive

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/src/test/java/smoketest/webapplicationtype/OverriddenWebApplicationTypeApplicationTests.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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 smoketest.webapplicationtype;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+import org.springframework.web.context.WebApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for an application using an overridden web application type
+ *
+ * @author Andy Wilkinson
+ */
+@SpringBootTest(properties = "spring.main.web-application-type=servlet")
+class OverriddenWebApplicationTypeApplicationTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Test
+	void contextIsServlet() {
+		assertThat(this.context).isInstanceOf(WebApplicationContext.class);
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/src/test/java/smoketest/webapplicationtype/SampleWebApplicationTypeApplicationTests.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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 smoketest.webapplicationtype;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.reactive.context.ReactiveWebApplicationContext;
+import org.springframework.context.ApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for an application using a configured web application type
+ *
+ * @author Andy Wilkinson
+ */
+@SpringBootTest
+class SampleWebApplicationTypeApplicationTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Test
+	void contextIsReactive() {
+		assertThat(this.context).isInstanceOf(ReactiveWebApplicationContext.class);
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-web-application-type/src/test/java/smoketest/webapplicationtype/WebEnvironmentNoneOverridesWebApplicationTypeTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012-2022 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
+ *
+ *      https://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 smoketest.webapplicationtype;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.web.reactive.context.ReactiveWebApplicationContext;
+import org.springframework.context.ApplicationContext;
+import org.springframework.web.context.WebApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for a web environment of none overriding the configured web
+ * application type.
+ *
+ * @author Andy Wilkinson
+ */
+@SpringBootTest(webEnvironment = WebEnvironment.NONE)
+class WebEnvironmentNoneOverridesWebApplicationTypeTests {
+
+	@Autowired
+	private ApplicationContext context;
+
+	@Test
+	void contextIsPlain() {
+		assertThat(this.context).isNotInstanceOf(ReactiveWebApplicationContext.class);
+		assertThat(this.context).isNotInstanceOf(WebApplicationContext.class);
+	}
+
+}