Update readme.md

Author: nilandev

testing-spring-boot-mongodb-testcontainer/readme.md

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-# Testing Spring Boot RESTFul API
+# Testing Spring Boot Repository Using MongoDB Testcontainers
 
+Testcontainers are lightweight, throwaway container instances, used for common test cases like testing against a database, ActiveMQ or anything else that can run in a Docker container.
+
+Testcontainers allows you to run your tests against a real instance of your application's dependencies, such as a real database, rather than against a mock or an in-memory database. We can configure the Testcontainers to closely mimic the production environment by using the specific versions of your dependencies and pre-loading with test data.
+
+It spins up a new container instance for each test, hence every test is completely isolated from each other.
+
+For running tests using the Testcontainers, we need to have the docker up and running, no other dependencies are required.
+
+Read [the full article here](https://stacktips.com/articles/testing-spring-boot-repository-using-mongodb-testcontainers)
+
+### Related topics:
+
+* [#spring-boot](https://stacktips.com/topics/spring-boot)
+* [#android](https://stacktips.com/topics/android)
+* [#java](https://stacktips.com/topics/java)
+* [#python](https://stacktips.com/topics/python)
+* [#spring](https://stacktips.com/topics/spring)
+* [#design-pattern](https://stacktips.com/topics/design-pattern)
+* [#git](https://stacktips.com/topics/git)
+* [#maven](https://stacktips.com/topics/maven)