testcontainers/testcontainers-java

★ 8,640JavaAudience · developerComplexity · 3/5LicenseSetup · moderate

Mindmap

mindmap
  root((Testcontainers Java))
    What it does
      Docker-backed tests
      Auto cleanup
      JUnit integration
    Supported services
      Databases
      Browsers
      Message queues
    Tech
      Java
      Docker
      JUnit
    Audience
      Java developers
      Backend engineers

mindmap root((Testcontainers Java)) What it does Docker-backed tests Auto cleanup JUnit integration Supported services Databases Browsers Message queues Tech Java Docker JUnit Audience Java developers Backend engineers

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Things people build with this

USE CASE 1

Spin up a real PostgreSQL or MySQL container for a JUnit integration test instead of using an in-memory database substitute.

USE CASE 2

Launch a browser container to run automated web UI tests against a real browser without installing one on the CI machine.

USE CASE 3

Write tests for code that depends on message queues, caches, or any other Docker-packaged service, with automatic cleanup after each run.

Tech stack

JavaDockerJUnit

Getting it running

Difficulty · moderate Time to first run · 30min

Requires Docker installed and running on the test machine or CI environment.

Use freely for any purpose under an MIT-style license, see the project documentation for the full copyright notice.

In plain English

Testcontainers is a Java library that makes it easier to write integration tests, which are tests that check how different parts of an application work together rather than in isolation. The specific problem it solves is that many applications depend on external services like databases, message queues, or web browsers, and setting up those services in a way that is consistent and doesn't interfere between test runs is traditionally difficult. The library handles this by starting real instances of those services inside Docker containers at the beginning of a test and shutting them down when the test finishes. Docker is a tool that can run software in isolated, self-contained environments on any machine that has it installed. Because the containers are created fresh for each test run and discarded afterward, tests do not leave behind leftover data that would affect the next run. The library works with the JUnit testing framework, which is the most common way Java developers write automated tests. Common use cases include spinning up a real PostgreSQL or MySQL database for a test instead of using a simplified in-memory substitute, or launching a browser instance to test a web interface. Any software that can be packaged as a Docker image can in principle be used through this library. The GitHub README for this project is minimal and primarily links out to the full documentation website. It confirms the MIT-style license and lists the project's copyright holders. Developers who want setup instructions or usage examples should visit the linked documentation site rather than the README itself.

Copy-paste prompts

Prompt 1

Using Testcontainers for Java, write a JUnit 5 test that starts a PostgreSQL container, runs a schema migration, inserts a row, and then reads it back to assert the result.

Prompt 2

Show me how to use Testcontainers to start a Selenium browser container and run a JUnit test that opens a URL and checks for a page title.

Prompt 3

I have a Spring Boot app that uses Redis. Write a Testcontainers JUnit 5 setup that starts a Redis container before the tests run and injects the host and port into my application properties.

Prompt 4

Explain the difference between @Container with @Testcontainers versus using a static container field in JUnit 5, and when I should prefer each approach.

Prompt 5

How do I reuse the same Testcontainers Docker container across multiple test classes to speed up my test suite?

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