如何在Spring Boot应用程序中配置嵌入式MongDB以进行集成测试？

Question

我有一个相当简单的Spring Boot应用程序，该应用程序公开了一个小的REST API并从MongoDB实例中检索数据。对MongoDB实例的查询通过基于Spring Data的存储库进行。下面是一些关键代码。

// Main application class
@EnableAutoConfiguration(exclude={MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})
@ComponentScan
@Import(MongoConfig.class)
public class ProductApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProductApplication.class, args);
    }
}

// Product repository with Spring data
public interface ProductRepository extends MongoRepository<Product, String> {

    Page<Product> findAll(Pageable pageable);

    Optional<Product> findByLineNumber(String lineNumber);
}

// Configuration for "live" connections
@Configuration
public class MongoConfig {

    @Value("${product.mongo.host}")
    private String mongoHost;

    @Value("${product.mongo.port}")
    private String mongoPort;

    @Value("${product.mongo.database}")
    private String mongoDatabase;

    @Bean(name="mongoClient")
    public MongoClient mongoClient() throws IOException {
        return new MongoClient(mongoHost, Integer.parseInt(mongoPort));
    }

    @Autowired
    @Bean(name="mongoDbFactory")
    public MongoDbFactory mongoDbFactory(MongoClient mongoClient) {
        return new SimpleMongoDbFactory(mongoClient, mongoDatabase);
    }

    @Autowired
    @Bean(name="mongoTemplate")
    public MongoTemplate mongoTemplate(MongoClient mongoClient) {
        return new MongoTemplate(mongoClient, mongoDatabase);
    }
}

@Configuration
@EnableMongoRepositories
public class EmbeddedMongoConfig {

    private static final String DB_NAME = "integrationTest";
    private static final int DB_PORT = 12345;
    private static final String DB_HOST = "localhost";
    private static final String DB_COLLECTION = "products";

    private MongodExecutable mongodExecutable = null;

    @Bean(name="mongoClient")
    public MongoClient mongoClient() throws IOException {
        // Lots of calls here to de.flapdoodle.embed.mongo code base to 
        // create an embedded db and insert some JSON data
    }

    @Autowired
    @Bean(name="mongoDbFactory")
    public MongoDbFactory mongoDbFactory(MongoClient mongoClient) {
        return new SimpleMongoDbFactory(mongoClient, DB_NAME);
    }

    @Autowired
    @Bean(name="mongoTemplate")
    public MongoTemplate mongoTemplate(MongoClient mongoClient) {
        return new MongoTemplate(mongoClient, DB_NAME);
    }

    @PreDestroy
    public void shutdownEmbeddedMongoDB() {
        if (this.mongodExecutable != null) {
            this.mongodExecutable.stop();
        }
    }
}

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = TestProductApplication.class)
@IntegrationTest
@WebAppConfiguration
public class WtrProductApplicationTests {

    @Test
    public void contextLoads() {
        // Tests empty for now
    }

}

@EnableAutoConfiguration(exclude={MongoAutoConfiguration.class, MongoDataAutoConfiguration.class})
@ComponentScan
@Import(EmbeddedMongoConfig.class)
public class TestProductApplication {

    public static void main(String[] args) {
        SpringApplication.run(TestProductApplication.class, args);
    }
}

因此，这里的想法是使集成测试（目前为空）连接到嵌入式mongo实例，而不是“实时”实例。但是，它不起作用。我可以看到测试连接到Mongo的“实时”实例，如果我关闭测试，该构建将失败，因为它仍在尝试连接到Mongo的实时实例。有人知道为什么是这样吗？如何获得测试以连接到嵌入式实例？

Answer 1

从Spring Boot版本1.3开始，有一个EmbeddedMongoAutoConfiguration现成的类。这意味着你根本不必创建配置文件，并且如果你要更改内容，仍然可以。

嵌入式MongoDB的自动配置已添加。对de.flapdoodle.embed：de.flapdoodle.embed.mongo的依赖是开始所必需的。可以通过application.properties控制配置（例如要使用的Mongo版本）。请参阅文档以获取更多信息。（Spring Boot发行说明）

必须添加到application.properties文件中的最基本，最重要的配置是