Testcontainers
Testcontainers is a Java library that supports JUnit tests, providing lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container. (by testcontainers)
S3Mock
A mock implementation of the AWS S3 API startable as Docker image, TestContainer, JUnit 4 rule, JUnit Jupiter extension or TestNG listener (by adobe)
| Testcontainers | S3Mock | |
|---|---|---|
| 13 | 4 | |
| 8,217 | 915 | |
| 0.6% | 2.1% | |
| 9.5 | 9.4 | |
| 7 days ago | 3 days ago | |
| Java | Kotlin | |
| MIT License | Apache License 2.0 |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Testcontainers
Posts with mentions or reviews of Testcontainers.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-03-11.
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One Container to Rule Them All - Until It Doesn’t
There are a handful of ways to start Testcontainers, including JUnit4 annotations, JUnit5 annotations, ApplicationContextInitializer, JDBC URL scheme, and manual container lifecycle control. Let's choose manual control for now as the least "magic" option:
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Top Resources to Learn Testcontainers
Repository
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Testcontainers
except the parent is wrong (at least the Java impl). see:
https://github.com/testcontainers/testcontainers-java/blob/m...
https://github.com/testcontainers/testcontainers-java/blob/m...
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Reasons to Drop Docker for Podman
> I wonder if Rancher Desktop, et al, works with testcontainers.org?
I don't use testcontainers myself, but it looks like as long as you are using Rancher Desktop >= 1.0.1 you should be just fine.[1]
[1] https://github.com/testcontainers/testcontainers-java/issues...
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K1s.me - Simplifying Kubernetes Journey for newbie’s
Thanks for the feedback. You are right, and there are some other mock-up alternatives as well, a good one for developers https://testcontainers.com/
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Database Testing with Testcontainers and Kotlin Exposed ORM
In this article, we will explore how to use Testcontainers and Exposed, a lightweight ORM framework for Kotlin, to create a controlled environment for testing MySQL Database operations.
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Spring Boot 3.1 RC1 is here - with support for Testcontainers and docker compose
Unfortunately, it still remains hard to use Testcontainers because of how wedded it is to junit4, five years after the release of junit 5. https://github.com/testcontainers/testcontainers-java/issues/970
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Spring, SchemaSpy DB docs, and GitHub Pages
Finally, we put the directory with generated contents (HTML, CSS, JS) into a tarball. Testcontainers library allows to copy files from a container to the OS but not directories. That’s why we need an archive inside the SchemaSpy container.
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Spring Cloud Gateway 4.0.0-RC2 native example with Testcontainers
This repository provides a BuildImageTest that uses the buildpack to create a native image. It then tests the native image, using Testcontainers and JUnit. Building the native image with AOT processing, as part of a test, takes minutes not seconds, and should not be part of normal "inner loop" development. So the BuildImageTest is in a separate sourceSet and can be executed independently. This is a very powerful pattern, that I'm just getting started with. I would love to hear your thoughts on this pattern or other alternatives to it.
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Testcontainers for Hashicorp Consul and Vault
The list goes on. Check out the full list of Testcontainer modules.
S3Mock
Posts with mentions or reviews of S3Mock.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-02-10.
- A Python Script to connect to GitHub and Fetches Search Results
- Simple self-hosted S3-compatible
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Stop Mocking Your System
I find services like this often work really well with hermetic integration tests:
https://github.com/adobe/S3Mock
It's more realistic than using mock objects/function calls and requires less maintenance.
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Monitoring, Alerting, Object Storage access for your CockroachDB cluster in Docker
Adobe S3Mock is a very simple S3 compatible service meant for some light testing.
What are some alternatives?
When comparing Testcontainers and S3Mock you can also consider the following projects:
Mockito - Most popular Mocking framework for unit tests written in Java
go-localstack - Go Wrapper for using localstack
GreenMail - Official master for the Greenmail project
flask-bones - An example of a large scale Flask application using blueprints and extensions.
WireMock - A tool for mocking HTTP services
Moto - A library that allows you to easily mock out tests based on AWS infrastructure.