Integration testing of SpringBoot with Postgres using TestContainers

Testing is an essential part of software development. It helps to ensure that the code is working as expected and that any changes do not introduce new bugs. When testing a Spring Boot application that connects to a PostgreSQL database, it is important to use a real database in the tests. This ensures that the tests are as realistic as possible and that they catch any errors that would occur in production.

Testcontainers is a library that makes it easy to run Docker containers in unit tests. This allows you to use a real PostgreSQL database in your tests without having to set up a separate database server.

To use Testcontainers to test your Spring Boot application, you will need to add the following dependencies to your project:

<dependency>
      <groupId>org.testcontainers</groupId>
      <artifactId>postgresql</artifactId>
      <version>1.18.3</version>
      <scope>test</scope>
  </dependency>
  <dependency>
      <groupId>org.testcontainers</groupId>
      <artifactId>junit-jupiter</artifactId>
      <version>1.18.3</version>
      <scope>test</scope>
  </dependency>

Create PostgresSQLContainer

This test first creates a PostgreSQL container using the postgreSQLContainer variable. The container is configured with the same…