Knowledge Factory

In this section, we will learn how to test Repository layer components with @DataMongoTest and Testcontainers in Spring Boot Data MongoDB application that uses MongoDB as database. 1.  What we will build? We will create a basic Data MongoDB Spring Boot application that uses MongoDB as database. We will create Repository layer for this application. Finally we will do a testing with help of Testcontainers and @DataMongoTest to verify our system is working as expected. 2. Testcontainers Testcontainers is an open source testing library that allows us to run docker containers directly in our spring boot application in order to facilitate integration tests with real dependencies.  It can provide instances of common databases(here MongoDB),  message brokers, Selenium web browsers, or anything else that can run in a Docker container. 3.  @ DataMongoTest Instead of bootstrapping the entire application context for every test,  @DataMongoTest  allows us to initialize the Spring application contex

In this section, we will learn how to test Repository layer components with @DataMongoTest in Spring Boot application. 1.  @ DataMongoTest Instead of bootstrapping the entire application context for every test, @DataMongoTest allows us to initialize the Spring application context with only those beans needed to test Data MongoDB-based components. By default, it scans for @Document classes and configures Spring Data MongoDB repositories.  It will auto-configure  MongoTemplate .  If an embedded database is available on the classpath, @DataMongoTest will autoconfigure one for testing purposes. Regular @Component , @Service or @Controller beans are not scanned when using this annotation.  This approach not only speeds up the testing process but also ensures a focused and efficient testing environment. This approach is also known as "slicing" the application context. Find the sample code snippet to use @DataMongoTest annotation in unit test class.   @DataMongoTest public cl