Use Testcontainers instead on Embedded Mongo

We've seen some problems, particularly on CI, where Embedded Mongo
hangs while trying to start the Mongo process. To limit the problem,
this commit replaces the use of Embedded Mongo with Testcontainers
where we can, leaving Embedded Mongo in use only where we're
specifically testing our Embedded Mongo support.

Closes gh-28843

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/ReactiveSessionAutoConfigurationMongoTests.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.
@@ -16,18 +16,23 @@
 
 package org.springframework.boot.autoconfigure.session;
 
+import java.time.Duration;
+
 import org.junit.jupiter.api.Test;
+import org.testcontainers.containers.MongoDBContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration;
-import org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration;
 import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.assertj.AssertableReactiveWebApplicationContext;
 import org.springframework.boot.test.context.runner.ContextConsumer;
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
+import org.springframework.boot.testsupport.testcontainers.DockerImageNames;
 import org.springframework.session.data.mongo.ReactiveMongoSessionRepository;
 import org.springframework.session.data.redis.ReactiveRedisSessionRepository;
 
@@ -38,34 +43,41 @@
  *
  * @author Andy Wilkinson
  */
+@Testcontainers
 class ReactiveSessionAutoConfigurationMongoTests extends AbstractSessionAutoConfigurationTests {
 
+	@Container
+	static final MongoDBContainer mongoDb = new MongoDBContainer(DockerImageNames.mongo()).withStartupAttempts(5)
+			.withStartupTimeout(Duration.ofMinutes(5));
+
 	private final ReactiveWebApplicationContextRunner contextRunner = new ReactiveWebApplicationContextRunner()
 			.withConfiguration(AutoConfigurations.of(SessionAutoConfiguration.class));
 
 	@Test
 	void defaultConfig() {
-		this.contextRunner.withPropertyValues("spring.session.store-type=mongodb")
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+		this.contextRunner
+				.withPropertyValues("spring.session.store-type=mongodb",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run(validateSpringSessionUsesMongo("sessions"));
 	}
 
 	@Test
 	void defaultConfigWithUniqueStoreImplementation() {
 		this.contextRunner.withClassLoader(new FilteredClassLoader(ReactiveRedisSessionRepository.class))
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+				.withPropertyValues("spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run(validateSpringSessionUsesMongo("sessions"));
 	}
 
 	@Test
 	void defaultConfigWithCustomTimeout() {
-		this.contextRunner.withPropertyValues("spring.session.store-type=mongodb", "spring.session.timeout=1m")
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+		this.contextRunner
+				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.timeout=1m",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run((context) -> {
 					ReactiveMongoSessionRepository repository = validateSessionRepository(context,
@@ -77,10 +89,10 @@ void defaultConfigWithCustomTimeout() {
 	@Test
 	void mongoSessionStoreWithCustomizations() {
 		this.contextRunner
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
-				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.mongodb.collection-name=foo")
+				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.mongodb.collection-name=foo",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
 				.run(validateSpringSessionUsesMongo("foo"));
 	}