testcontainers/testcontainers-java

Support parallel JUnit 5 tests

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#1,495 opened on May 22, 2019

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 (41 comments) (86 reactions) (0 assignees)Java (7,535 stars) (1,588 forks)batch import
help wantedresolution/acknowledged

Description

https://www.testcontainers.org/test_framework_integration/junit_5/ states:

Note: This extension has only be tested with sequential test execution. Using it with parallel test execution is unsupported and may have unintended side effects.

To me, the entire point of using Test Containers is to speed up parallel builds. I could easily get sequential tests working without it.

Please add support for parallel JUnit builds.

Contributor guide

Tech stack
java
Domain
testing
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JUnit 5 extension knowledgeTestcontainers internalsConcurrency principles
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Review the current JUnit 5 extension implementation in the testcontainers java repository, focusing on the TestcontainersExtension class and its assumption of sequential test execution. Examine the official JUnit 5 documentation for parallel execution support. Look at the issue comments for proposed approaches and concerns, especially regarding shared container instances and thread safety. Explore any linked PRs or branches that attempted to address this feature.
Support parallel JUnit 5 tests · testcontainers/testcontainers-java#1495 | Good First Issue