Add transaction auto-configuration to @DataMongoTest

Closes gh-20182

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

@@ -66,6 +66,7 @@ dependencies {
 	testImplementation("org.aspectj:aspectjrt")
 	testImplementation("org.aspectj:aspectjweaver")
 	testImplementation("org.assertj:assertj-core")
+	testImplementation("org.awaitility:awaitility")
 	testImplementation("org.hibernate.validator:hibernate-validator")
 	testImplementation("org.hsqldb:hsqldb")
 	testImplementation("org.jooq:jooq")

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

@@ -37,7 +37,8 @@ org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoC
 org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\
 org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
 org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
-org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration
+org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
+org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration
 
 # AutoConfigureDataNeo4j auto-configuration imports
 org.springframework.boot.test.autoconfigure.data.neo4j.AutoConfigureDataNeo4j=\

spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/data/mongo/TransactionalDataMongoTestIntegrationTests.java

@@ -0,0 +1,136 @@
+/*
+ * Copyright 2012-2020 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.data.mongo;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.List;
+
+import com.mongodb.BasicDBList;
+import com.mongodb.ServerAddress;
+import com.mongodb.client.ClientSession;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.connection.ServerDescription;
+import de.flapdoodle.embed.mongo.config.IMongoCmdOptions;
+import de.flapdoodle.embed.mongo.config.IMongodConfig;
+import de.flapdoodle.embed.mongo.config.MongoCmdOptionsBuilder;
+import de.flapdoodle.embed.mongo.config.MongodConfigBuilder;
+import de.flapdoodle.embed.mongo.config.Storage;
+import de.flapdoodle.embed.mongo.distribution.Version;
+import org.awaitility.Awaitility;
+import org.bson.Document;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoProperties;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.mongodb.MongoDatabaseFactory;
+import org.springframework.data.mongodb.MongoTransactionManager;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.transaction.annotation.Transactional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for using {@link DataMongoTest @DataMongoTest} with transactions.
+ *
+ * @author Andy Wilkinson
+ */
+@DataMongoTest
+@Transactional
+class TransactionalDataMongoTestIntegrationTests {
+
+	@Autowired
+	private ExampleRepository exampleRepository;
+
+	@Test
+	void testRepository() {
+		ExampleDocument exampleDocument = new ExampleDocument();
+		exampleDocument.setText("Look, new @DataMongoTest!");
+		exampleDocument = this.exampleRepository.save(exampleDocument);
+		assertThat(exampleDocument.getId()).isNotNull();
+	}
+
+	@TestConfiguration(proxyBeanMethods = false)
+	static class TransactionManagerConfiguration {
+
+		@Bean
+		MongoTransactionManager mongoTransactionManager(MongoDatabaseFactory dbFactory) {
+			return new MongoTransactionManager(dbFactory);
+		}
+
+	}
+
+	@TestConfiguration(proxyBeanMethods = false)
+	static class MongoCustomizationConfiguration {
+
+		private static final String REPLICA_SET_NAME = "rs1";
+
+		@Bean
+		IMongodConfig embeddedMongoConfiguration(EmbeddedMongoProperties embeddedProperties) throws IOException {
+			IMongoCmdOptions cmdOptions = new MongoCmdOptionsBuilder().useNoJournal(false).build();
+			return new MongodConfigBuilder().version(Version.Main.PRODUCTION)
+					.replication(new Storage(null, REPLICA_SET_NAME, 0)).cmdOptions(cmdOptions)
+					.stopTimeoutInMillis(60000).build();
+		}
+
+		@Bean
+		MongoInitializer mongoInitializer(MongoClient client, MongoTemplate template) {
+			return new MongoInitializer(client, template);
+		}
+
+		static class MongoInitializer implements InitializingBean {
+
+			private final MongoClient client;
+
+			private final MongoTemplate template;
+
+			MongoInitializer(MongoClient client, MongoTemplate template) {
+				this.client = client;
+				this.template = template;
+			}
+
+			@Override
+			public void afterPropertiesSet() throws Exception {
+				List<ServerDescription> servers = this.client.getClusterDescription().getServerDescriptions();
+				assertThat(servers).hasSize(1);
+				ServerAddress address = servers.get(0).getAddress();
+				BasicDBList members = new BasicDBList();
+				members.add(new Document("_id", 0).append("host", address.getHost() + ":" + address.getPort()));
+				Document config = new Document("_id", REPLICA_SET_NAME);
+				config.put("members", members);
+				MongoDatabase admin = this.client.getDatabase("admin");
+				admin.runCommand(new Document("replSetInitiate", config));
+				Awaitility.await().atMost(Duration.ofMinutes(1)).until(() -> {
+					try (ClientSession session = this.client.startSession()) {
+						return true;
+					}
+					catch (Exception ex) {
+						return false;
+					}
+				});
+				this.template.createCollection("exampleDocuments");
+			}
+
+		}
+
+	}
+
+}