Auto-configure GraphQlTester

This commit adds the required infrastructure to auto-configure a
`GraphQlTester` or `WebGraphQlTester` in Spring Boot tests.
Specific annotations like `AutoConfigureGraphQlTester` and
`AutoConfigureWebGraphQlTester` will contribute pre-configured beans for
testing a GraphQL with the tester.

This also ships a `ContextCustomize` for contributing a `GraphQlTester`
in the case of a full `@SpringBootTest` integration test against a live
server.

See gh-29140

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/GraphQlTestContextBootstrapper.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.autoconfigure.graphql;
+
+import org.springframework.boot.test.context.SpringBootTestContextBootstrapper;
+import org.springframework.core.annotation.MergedAnnotations;
+import org.springframework.test.context.TestContextBootstrapper;
+
+/**
+ * {@link TestContextBootstrapper} for {@link GraphQlTest @GraphQlTest}.
+ *
+ * @author Brian Clozel
+ */
+class GraphQlTestContextBootstrapper extends SpringBootTestContextBootstrapper {
+
+	@Override
+	protected String[] getProperties(Class<?> testClass) {
+		return MergedAnnotations.from(testClass, MergedAnnotations.SearchStrategy.INHERITED_ANNOTATIONS)
+				.get(GraphQlTest.class).getValue("properties", String[].class).orElse(null);
+	}
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/AutoConfigureGraphQlTester.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.autoconfigure.graphql.tester;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
+import org.springframework.graphql.test.tester.GraphQlTester;
+
+/**
+ * Annotation that can be applied to a test class to enable a {@link GraphQlTester}.
+ *
+ * @author Brian Clozel
+ * @since 2.7.0
+ * @see GraphQlTesterAutoConfiguration
+ */
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Inherited
+@ImportAutoConfiguration
+public @interface AutoConfigureGraphQlTester {
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/AutoConfigureWebGraphQlTester.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.autoconfigure.graphql.tester;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.graphql.test.tester.WebGraphQlTester;
+
+/**
+ * Annotation that can be applied to a test class to enable a {@link WebGraphQlTester}.
+ *
+ * <p>
+ * This annotation should be used with
+ * {@link org.springframework.boot.test.context.SpringBootTest @SpringBootTest} tests with
+ * Spring MVC or Spring WebFlux mock infrastructures.
+ *
+ * @author Brian Clozel
+ * @since 2.7.0
+ * @see WebGraphQlTesterAutoConfiguration
+ */
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+@Inherited
+@AutoConfigureMockMvc
+@AutoConfigureWebTestClient
+@ImportAutoConfiguration
+public @interface AutoConfigureWebGraphQlTester {
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfiguration.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.autoconfigure.graphql.tester;
+
+import graphql.GraphQL;
+
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.graphql.GraphQlAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.graphql.GraphQlService;
+import org.springframework.graphql.test.tester.GraphQlTester;
+
+/**
+ * Auto-configuration for {@link GraphQlTester}.
+ *
+ * @author Brian Clozel
+ * @since 2.7.0
+ */
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnClass({ GraphQL.class, GraphQlTester.class })
+@AutoConfigureAfter(GraphQlAutoConfiguration.class)
+public class GraphQlTesterAutoConfiguration {
+
+	@Bean
+	@ConditionalOnBean(GraphQlService.class)
+	@ConditionalOnMissingBean
+	public GraphQlTester graphQlTester(GraphQlService graphQlService) {
+		return GraphQlTester.create(graphQlService);
+	}
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/WebGraphQlTesterAutoConfiguration.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.autoconfigure.graphql.tester;
+
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.graphql.GraphQlProperties;
+import org.springframework.boot.test.autoconfigure.web.reactive.WebTestClientAutoConfiguration;
+import org.springframework.boot.test.autoconfigure.web.servlet.MockMvcAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.graphql.test.tester.WebGraphQlTester;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.web.reactive.function.client.WebClient;
+
+/**
+ * Auto-configuration for {@link WebGraphQlTester}.
+ *
+ * @author Brian Clozel
+ * @since 2.7.0
+ */
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnClass({ WebClient.class, WebTestClient.class, WebGraphQlTester.class })
+@AutoConfigureAfter({ WebTestClientAutoConfiguration.class, MockMvcAutoConfiguration.class })
+public class WebGraphQlTesterAutoConfiguration {
+
+	@Bean
+	@ConditionalOnBean(WebTestClient.class)
+	@ConditionalOnMissingBean
+	public WebGraphQlTester webTestClientGraphQlTester(WebTestClient webTestClient, GraphQlProperties properties) {
+		WebTestClient mutatedWebTestClient = webTestClient.mutate().baseUrl(properties.getPath()).build();
+		return WebGraphQlTester.create(mutatedWebTestClient);
+	}
+
+}

spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020-2021 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.
+ */
+
+/**
+ * Auto-configuration for GraphQL tester.
+ */
+package org.springframework.boot.test.autoconfigure.graphql.tester;

spring-boot-project/spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -194,6 +194,14 @@ org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
 org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
 org.springframework.boot.autoconfigure.graphql.GraphQlAutoConfiguration
 
+# AutoConfigureGraphQlTester auto-configuration imports
+org.springframework.boot.test.autoconfigure.graphql.tester.AutoConfigureGraphQlTester=\
+org.springframework.boot.test.autoconfigure.graphql.tester.GraphQlTesterAutoConfiguration
+
+# AutoConfigureWebGraphQlTester auto-configuration imports
+org.springframework.boot.test.autoconfigure.graphql.tester.AutoConfigureWebGraphQlTester=\
+org.springframework.boot.test.autoconfigure.graphql.tester.WebGraphQlTesterAutoConfiguration
+
 # AutoConfigureWebServiceClient
 org.springframework.boot.test.autoconfigure.webservices.client.AutoConfigureWebServiceClient=\
 org.springframework.boot.test.autoconfigure.webservices.client.WebServiceClientTemplateAutoConfiguration,\

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfigurationTests.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2012-2021 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 org.springframework.boot.test.autoconfigure.graphql.tester;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.graphql.GraphQlService;
+import org.springframework.graphql.test.tester.GraphQlTester;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link GraphQlTesterAutoConfiguration}.
+ *
+ * @author Brian Clozel
+ */
+class GraphQlTesterAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(GraphQlTesterAutoConfiguration.class));
+
+	@Test
+	void shouldNotContributeTesterIfGraphQlServiceNotPresent() {
+		this.contextRunner.run((context) -> assertThat(context).hasNotFailed().doesNotHaveBean(GraphQlTester.class));
+	}
+
+	@Test
+	void shouldContributeTester() {
+		this.contextRunner.withUserConfiguration(CustomGraphQlServiceConfiguration.class)
+				.run((context) -> assertThat(context).hasNotFailed().hasSingleBean(GraphQlTester.class));
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class CustomGraphQlServiceConfiguration {
+
+		@Bean
+		GraphQlService graphQlService() {
+			return mock(GraphQlService.class);
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-test/build.gradle

@@ -36,6 +36,7 @@ dependencies {
 	optional("org.springframework:spring-test")
 	optional("org.springframework:spring-web")
 	optional("org.springframework:spring-webflux")
+	optional("org.springframework.graphql:spring-graphql-test")
 	optional("net.sourceforge.htmlunit:htmlunit") {
 		exclude(group: "commons-logging", module: "commons-logging")
 	}

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/graphql/tester/GraphQlTesterContextCustomizer.java

@@ -0,0 +1,218 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.graphql.tester;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.beans.factory.BeanFactoryUtils;
+import org.springframework.beans.factory.FactoryBean;
+import org.springframework.beans.factory.ListableBeanFactory;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.beans.factory.support.BeanDefinitionRegistry;
+import org.springframework.beans.factory.support.BeanDefinitionRegistryPostProcessor;
+import org.springframework.beans.factory.support.RootBeanDefinition;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.server.AbstractConfigurableWebServerFactory;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.Ordered;
+import org.springframework.graphql.test.tester.GraphQlTester;
+import org.springframework.graphql.test.tester.WebGraphQlTester;
+import org.springframework.test.context.ContextCustomizer;
+import org.springframework.test.context.MergedContextConfiguration;
+import org.springframework.test.context.TestContextAnnotationUtils;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.StringUtils;
+import org.springframework.web.context.WebApplicationContext;
+
+/**
+ * {@link ContextCustomizer} for {@link GraphQlTester}.
+ *
+ * @author Brian Clozel
+ */
+class GraphQlTesterContextCustomizer implements ContextCustomizer {
+
+	@Override
+	public void customizeContext(ConfigurableApplicationContext context, MergedContextConfiguration mergedConfig) {
+		SpringBootTest springBootTest = TestContextAnnotationUtils.findMergedAnnotation(mergedConfig.getTestClass(),
+				SpringBootTest.class);
+		if (springBootTest.webEnvironment().isEmbedded()) {
+			registerGraphQlTester(context);
+		}
+	}
+
+	private void registerGraphQlTester(ConfigurableApplicationContext context) {
+		ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
+		if (beanFactory instanceof BeanDefinitionRegistry) {
+			registerGraphQlTester((BeanDefinitionRegistry) beanFactory);
+		}
+	}
+
+	private void registerGraphQlTester(BeanDefinitionRegistry registry) {
+		RootBeanDefinition definition = new RootBeanDefinition(GraphQlTesterRegistrar.class);
+		definition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
+		registry.registerBeanDefinition(GraphQlTesterRegistrar.class.getName(), definition);
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		return (obj != null) && (obj.getClass() == getClass());
+	}
+
+	@Override
+	public int hashCode() {
+		return getClass().hashCode();
+	}
+
+	private static class GraphQlTesterRegistrar
+			implements BeanDefinitionRegistryPostProcessor, Ordered, BeanFactoryAware {
+
+		private BeanFactory beanFactory;
+
+		@Override
+		public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+			this.beanFactory = beanFactory;
+		}
+
+		@Override
+		public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
+			if (BeanFactoryUtils.beanNamesForTypeIncludingAncestors((ListableBeanFactory) this.beanFactory,
+					GraphQlTester.class, false, false).length == 0) {
+				registry.registerBeanDefinition(WebGraphQlTester.class.getName(),
+						new RootBeanDefinition(GraphQlTesterFactory.class));
+			}
+		}
+
+		@Override
+		public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
+
+		}
+
+		@Override
+		public int getOrder() {
+			return Ordered.LOWEST_PRECEDENCE - 1;
+		}
+
+	}
+
+	public static class GraphQlTesterFactory implements FactoryBean<GraphQlTester>, ApplicationContextAware {
+
+		private static final String SERVLET_APPLICATION_CONTEXT_CLASS = "org.springframework.web.context.WebApplicationContext";
+
+		private static final String REACTIVE_APPLICATION_CONTEXT_CLASS = "org.springframework.boot.web.reactive.context.ReactiveWebApplicationContext";
+
+		private ApplicationContext applicationContext;
+
+		private GraphQlTester object;
+
+		@Override
+		public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+			this.applicationContext = applicationContext;
+		}
+
+		@Override
+		public boolean isSingleton() {
+			return true;
+		}
+
+		@Override
+		public Class<?> getObjectType() {
+			return GraphQlTester.class;
+		}
+
+		@Override
+		public GraphQlTester getObject() throws Exception {
+			if (this.object == null) {
+				this.object = createGraphQlTester();
+			}
+			return this.object;
+		}
+
+		private WebGraphQlTester createGraphQlTester() {
+			WebTestClient webTestClient = this.applicationContext.getBean(WebTestClient.class);
+			boolean sslEnabled = isSslEnabled(this.applicationContext);
+			String port = this.applicationContext.getEnvironment().getProperty("local.server.port", "8080");
+			WebTestClient mutatedWebClient = webTestClient.mutate().baseUrl(getBaseUrl(sslEnabled, port)).build();
+			return WebGraphQlTester.create(mutatedWebClient);
+		}
+
+		private String getBaseUrl(boolean sslEnabled, String port) {
+			String basePath = deduceBasePath();
+			return (sslEnabled ? "https" : "http") + "://localhost:" + port + basePath;
+		}
+
+		private String deduceBasePath() {
+			return deduceServerBasePath() + findConfiguredGraphQlPath();
+		}
+
+		private String findConfiguredGraphQlPath() {
+			String configuredPath = this.applicationContext.getEnvironment().getProperty("spring.graphql.path");
+			return StringUtils.hasText(configuredPath) ? configuredPath : "/graphql";
+		}
+
+		private String deduceServerBasePath() {
+			String serverBasePath = "";
+			WebApplicationType webApplicationType = deduceFromApplicationContext(this.applicationContext.getClass());
+			if (webApplicationType == WebApplicationType.REACTIVE) {
+				serverBasePath = this.applicationContext.getEnvironment().getProperty("spring.webflux.base-path");
+
+			}
+			else if (webApplicationType == WebApplicationType.SERVLET) {
+				serverBasePath = ((WebApplicationContext) this.applicationContext).getServletContext().getContextPath();
+			}
+			return (serverBasePath != null) ? serverBasePath : "";
+		}
+
+		static WebApplicationType deduceFromApplicationContext(Class<?> applicationContextClass) {
+			if (isAssignable(SERVLET_APPLICATION_CONTEXT_CLASS, applicationContextClass)) {
+				return WebApplicationType.SERVLET;
+			}
+			if (isAssignable(REACTIVE_APPLICATION_CONTEXT_CLASS, applicationContextClass)) {
+				return WebApplicationType.REACTIVE;
+			}
+			return WebApplicationType.NONE;
+		}
+
+		private static boolean isAssignable(String target, Class<?> type) {
+			try {
+				return ClassUtils.resolveClassName(target, null).isAssignableFrom(type);
+			}
+			catch (Throwable ex) {
+				return false;
+			}
+		}
+
+		private boolean isSslEnabled(ApplicationContext context) {
+			try {
+				AbstractConfigurableWebServerFactory webServerFactory = context
+						.getBean(AbstractConfigurableWebServerFactory.class);
+				return webServerFactory.getSsl() != null && webServerFactory.getSsl().isEnabled();
+			}
+			catch (NoSuchBeanDefinitionException ex) {
+				return false;
+			}
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/graphql/tester/GraphQlTesterContextCustomizerFactory.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2020-2021 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 org.springframework.boot.test.graphql.tester;
+
+import java.util.List;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.graphql.test.tester.GraphQlTester;
+import org.springframework.test.context.ContextConfigurationAttributes;
+import org.springframework.test.context.ContextCustomizer;
+import org.springframework.test.context.ContextCustomizerFactory;
+import org.springframework.test.context.TestContextAnnotationUtils;
+import org.springframework.util.ClassUtils;
+
+/**
+ * {@link ContextCustomizerFactory} for {@link GraphQlTester}.
+ *
+ * @author Brian Clozel
+ * @see GraphQlTesterContextCustomizer
+ */
+class GraphQlTesterContextCustomizerFactory implements ContextCustomizerFactory {
+
+	private static final String GRAPHQLTESTER_CLASS = "org.springframework.graphql.test.tester.GraphQlTester";
+
+	private static final String WEBTESTCLIENT_CLASS = "org.springframework.test.web.reactive.server.WebTestClient";
+
+	@Override
+	public ContextCustomizer createContextCustomizer(Class<?> testClass,
+			List<ContextConfigurationAttributes> configAttributes) {
+		SpringBootTest springBootTest = TestContextAnnotationUtils.findMergedAnnotation(testClass,
+				SpringBootTest.class);
+		return (springBootTest != null && isGraphQlTesterPresent()) ? new GraphQlTesterContextCustomizer() : null;
+	}
+
+	private boolean isGraphQlTesterPresent() {
+		return ClassUtils.isPresent(WEBTESTCLIENT_CLASS, getClass().getClassLoader())
+				&& ClassUtils.isPresent(GRAPHQLTESTER_CLASS, getClass().getClassLoader());
+	}
+
+}

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/graphql/tester/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020-2021 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.
+ */
+
+/**
+ * {@link org.springframework.graphql.test.tester.GraphQlTester} utilities.
+ */
+package org.springframework.boot.test.graphql.tester;

spring-boot-project/spring-boot-test/src/main/resources/META-INF/spring.factories

@@ -2,6 +2,7 @@
 org.springframework.test.context.ContextCustomizerFactory=\
 org.springframework.boot.test.context.ImportsContextCustomizerFactory,\
 org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizerFactory,\
+org.springframework.boot.test.graphql.tester.GraphQlTesterContextCustomizerFactory,\
 org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory,\
 org.springframework.boot.test.mock.mockito.MockitoContextCustomizerFactory,\
 org.springframework.boot.test.web.client.TestRestTemplateContextCustomizerFactory,\

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/graphql/tester/GraphQlTesterContextCustomizerIntegrationTests.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2012-2021 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 org.springframework.boot.test.graphql.tester;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.embedded.tomcat.TomcatReactiveWebServerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.graphql.test.tester.GraphQlTester;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ContextPathCompositeHandler;
+import org.springframework.http.server.reactive.HttpHandler;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.test.annotation.DirtiesContext;
+
+/**
+ * Integration test for {@link GraphQlTesterContextCustomizer}.
+ *
+ * @author Brian Clozel
+ */
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
+		properties = "spring.main.web-application-type=reactive")
+@DirtiesContext
+class GraphQlTesterContextCustomizerIntegrationTests {
+
+	@Autowired
+	GraphQlTester graphQlTester;
+
+	@Test
+	void shouldHandleGraphQlRequests() {
+		this.graphQlTester.query("{}").executeAndVerify();
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class TestConfig {
+
+		@Bean
+		TomcatReactiveWebServerFactory webServerFactory() {
+			return new TomcatReactiveWebServerFactory(0);
+		}
+
+		@Bean
+		HttpHandler httpHandler() {
+			TestHandler httpHandler = new TestHandler();
+			Map<String, HttpHandler> handlersMap = Collections.singletonMap("/graphql", httpHandler);
+			return new ContextPathCompositeHandler(handlersMap);
+		}
+
+	}
+
+	static class TestHandler implements HttpHandler {
+
+		private static final DefaultDataBufferFactory factory = new DefaultDataBufferFactory();
+
+		@Override
+		public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response) {
+			response.setStatusCode(HttpStatus.OK);
+			response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
+			return response.writeWith(Mono.just(factory.wrap("{\"data\":{}}".getBytes())));
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/graphql/tester/GraphQlTesterContextCustomizerWithCustomBasePathTests.java

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2012-2021 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 org.springframework.boot.test.graphql.tester;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.web.embedded.tomcat.TomcatReactiveWebServerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.graphql.test.tester.GraphQlTester;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.server.reactive.ContextPathCompositeHandler;
+import org.springframework.http.server.reactive.HttpHandler;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.test.context.TestPropertySource;
+
+/**
+ * Tests for {@link GraphQlTesterContextCustomizer} with a custom context path for a
+ * Reactive web application.
+ *
+ * @author Brian Clozel
+ */
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@TestPropertySource(properties = { "spring.main.web-application-type=reactive", "spring.webflux.base-path=/test" })
+class GraphQlTesterContextCustomizerWithCustomBasePathTests {
+
+	@Autowired
+	GraphQlTester graphQlTester;
+
+	@Test
+	void shouldHandleGraphQlRequests() {
+		this.graphQlTester.query("{}").executeAndVerify();
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class TestConfig {
+
+		@Bean
+		TomcatReactiveWebServerFactory webServerFactory() {
+			return new TomcatReactiveWebServerFactory(0);
+		}
+
+		@Bean
+		HttpHandler httpHandler() {
+			TestHandler httpHandler = new TestHandler();
+			Map<String, HttpHandler> handlersMap = Collections.singletonMap("/test/graphql", httpHandler);
+			return new ContextPathCompositeHandler(handlersMap);
+		}
+
+	}
+
+	static class TestHandler implements HttpHandler {
+
+		private static final DefaultDataBufferFactory factory = new DefaultDataBufferFactory();
+
+		@Override
+		public Mono<Void> handle(ServerHttpRequest request, ServerHttpResponse response) {
+			response.setStatusCode(HttpStatus.OK);
+			response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
+			return response.writeWith(Mono.just(factory.wrap("{\"data\":{}}".getBytes())));
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/graphql/tester/GraphQlTesterContextCustomizerWithCustomContextPathTests.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2012-2021 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 org.springframework.boot.test.graphql.tester;
+
+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.embedded.tomcat.TomcatServletWebServerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.graphql.test.tester.GraphQlTester;
+import org.springframework.http.MediaType;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.DispatcherServlet;
+
+/**
+ * Tests for {@link GraphQlTesterContextCustomizer} with a custom context path for a
+ * Servlet web application.
+ *
+ * @author Brian Clozel
+ */
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@TestPropertySource(properties = "server.servlet.context-path=/test")
+class GraphQlTesterContextCustomizerWithCustomContextPathTests {
+
+	@Autowired
+	GraphQlTester graphQlTester;
+
+	@Test
+	void shouldHandleGraphQlRequests() {
+		this.graphQlTester.query("{}").executeAndVerify();
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@Import(TestController.class)
+	static class TestConfig {
+
+		@Bean
+		TomcatServletWebServerFactory webServerFactory() {
+			TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory(0);
+			factory.setContextPath("/test");
+			return factory;
+		}
+
+		@Bean
+		DispatcherServlet dispatcherServlet() {
+			return new DispatcherServlet();
+		}
+
+	}
+
+	@RestController
+	static class TestController {
+
+		@PostMapping(path = "/graphql", produces = MediaType.APPLICATION_JSON_VALUE)
+		String graphql() {
+			return "{}";
+		}
+
+	}
+
+}