Generate help section for Testcontainers

This help section contains the docker images and tags used for the
Testcontainers.

start-site/src/main/java/io/spring/start/site/extension/dependency/testcontainers/TestContainersHelpDocumentCustomizer.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2023 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 io.spring.start.site.extension.dependency.testcontainers;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import io.spring.initializr.generator.project.ProjectDescription;
+import io.spring.initializr.generator.spring.documentation.HelpDocument;
+import io.spring.initializr.generator.spring.documentation.HelpDocumentCustomizer;
+import io.spring.start.site.container.DockerService;
+import io.spring.start.site.container.ServiceConnections;
+import io.spring.start.site.container.ServiceConnections.ServiceConnection;
+
+/**
+ * A {@link HelpDocumentCustomizer} that provide additional information about the
+ * Testcontainers that are defined for the project.
+ *
+ * @author Moritz Halbritter
+ */
+class TestContainersHelpDocumentCustomizer implements HelpDocumentCustomizer {
+
+	private final ProjectDescription description;
+
+	private final ServiceConnections serviceConnections;
+
+	TestContainersHelpDocumentCustomizer(ProjectDescription description, ServiceConnections serviceConnections) {
+		this.description = description;
+		this.serviceConnections = serviceConnections;
+	}
+
+	@Override
+	public void customize(HelpDocument document) {
+		String referenceDocUrl = "https://docs.spring.io/spring-boot/docs/%s/reference/html/features.html#features.testing.testcontainers"
+			.formatted(this.description.getPlatformVersion());
+		document.gettingStarted().addReferenceDocLink(referenceDocUrl, "Spring Boot Testcontainers support");
+
+		Map<String, Object> model = new HashMap<>();
+		List<DockerService> dockerServices = this.serviceConnections.values()
+			.map(ServiceConnection::dockerService)
+			.toList();
+		model.put("services", dockerServices);
+		model.put("testcontainersAtDevelopmentTimeLink",
+				"https://docs.spring.io/spring-boot/docs/%s/reference/html/features.html#features.testing.testcontainers.at-development-time"
+					.formatted(this.description.getPlatformVersion()));
+		document.addSection("testcontainers", model);
+	}
+
+}

start-site/src/main/java/io/spring/start/site/extension/dependency/testcontainers/TestcontainersProjectGenerationConfiguration.java

@@ -29,7 +29,6 @@
 import io.spring.initializr.generator.project.ProjectDescription;
 import io.spring.initializr.generator.project.ProjectGenerationConfiguration;
 import io.spring.initializr.generator.spring.build.BuildCustomizer;
-import io.spring.initializr.generator.spring.documentation.HelpDocumentCustomizer;
 import io.spring.start.site.container.ServiceConnections;
 import io.spring.start.site.container.ServiceConnectionsCustomizer;
 import io.spring.start.site.support.implicit.ImplicitDependency;
@@ -39,12 +38,14 @@
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
 
 /**
  * Configuration for generation of projects that depend on Testcontainers.
  *
  * @author Maciej Walkowiak
  * @author Stephane Nicoll
+ * @author Moritz Halbritter
  */
 @ProjectGenerationConfiguration
 @ConditionalOnRequestedDependency("testcontainers")
@@ -68,6 +69,20 @@ public ImplicitDependencyHelpDocumentCustomizer testcontainersHelpCustomizer(Bui
 
 	@Configuration(proxyBeanMethods = false)
 	@ConditionalOnPlatformVersion("3.1.0-RC1")
+	static class ServiceConnectionsConfiguration {
+
+		@Bean
+		ServiceConnections serviceConnections(ObjectProvider<ServiceConnectionsCustomizer> customizers) {
+			ServiceConnections serviceConnections = new ServiceConnections();
+			customizers.orderedStream().forEach((customizer) -> customizer.customize(serviceConnections));
+			return serviceConnections;
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnPlatformVersion("3.1.0-RC1")
+	@Import(ServiceConnectionsConfiguration.class)
 	static class SpringBootSupportConfiguration {
 
 		@Bean
@@ -80,20 +95,16 @@ BuildCustomizer<Build> springBootTestcontainersBuildCustomizer() {
 		}
 
 		@Bean
-		HelpDocumentCustomizer springBootTestcontainersHelpDocumentCustomizer(ProjectDescription description) {
-			return (helpDocument) -> {
-				String referenceDocUrl = String.format(
-						"https://docs.spring.io/spring-boot/docs/%s/reference/html/features.html#features.testing.testcontainers",
-						description.getPlatformVersion());
-				helpDocument.gettingStarted()
-					.addReferenceDocLink(referenceDocUrl, "Spring Boot Testcontainers support");
-			};
+		TestContainersHelpDocumentCustomizer springBootTestcontainersHelpDocumentCustomizer(
+				ProjectDescription description, ServiceConnections serviceConnections) {
+			return new TestContainersHelpDocumentCustomizer(description, serviceConnections);
 		}
 
 	}
 
 	@Configuration(proxyBeanMethods = false)
 	@ConditionalOnPlatformVersion("3.1.0-RC1")
+	@Import(ServiceConnectionsConfiguration.class)
 	static class TestApplicationConfiguration {
 
 		private final ProjectDescription description;
@@ -105,13 +116,6 @@ static class TestApplicationConfiguration {
 			this.indentingWriterFactory = indentingWriterFactory;
 		}
 
-		@Bean
-		ServiceConnections serviceConnections(ObjectProvider<ServiceConnectionsCustomizer> customizers) {
-			ServiceConnections serviceConnections = new ServiceConnections();
-			customizers.orderedStream().forEach((customizer) -> customizer.customize(serviceConnections));
-			return serviceConnections;
-		}
-
 		@Bean
 		@ConditionalOnLanguage(GroovyLanguage.ID)
 		GroovyTestContainersApplicationCodeProjectContributor groovyTestContainersApplicationCodeProjectContributor(

start-site/src/main/resources/templates/testcontainers.mustache

@@ -0,0 +1,13 @@
+### Testcontainers support
+
+This project uses [Testcontainers at development time]({{testcontainersAtDevelopmentTimeLink}}).
+
+{{#services.size}}
+Testcontainers has been configured to use the following Docker images:
+
+{{#services}}
+* [`{{image}}:{{imageTag}}`]({{website}})
+{{/services}}
+
+Please review the tags of the used images and set them to the same as you're running in production.
+{{/services.size}}

start-site/src/test/java/io/spring/start/site/extension/dependency/testcontainers/TestcontainersProjectGenerationConfigurationTests.java

@@ -37,6 +37,7 @@
  * @author Stephane Nicoll
  * @author Eddú Meléndez
  * @author Chris Bono
+ * @author Moritz Halbritter
  */
 class TestcontainersProjectGenerationConfigurationTests extends AbstractExtensionTests {
 
@@ -344,6 +345,16 @@ fun main(args: Array<String>) {
 					""");
 	}
 
+	@Test
+	void shouldAddHelpSection() {
+		assertHelpDocument("3.1.5", "testcontainers", "data-mongodb", "postgresql").contains(
+				"https://docs.spring.io/spring-boot/docs/3.1.5/reference/html/features.html#features.testing.testcontainers")
+			.contains(
+					"https://docs.spring.io/spring-boot/docs/3.1.5/reference/html/features.html#features.testing.testcontainers.at-development-time")
+			.contains("mongo:latest")
+			.contains("postgres:latest");
+	}
+
 	private ProjectStructure generateProject(String platformVersion, String... dependencies) {
 		ProjectRequest request = createProjectRequest(dependencies);
 		request.setBootVersion(platformVersion);