TestNG vs Testing Library

Free and open source

Free and open source

Free and open source. You pay in engineering time and CI minutes.

Free and open source. You pay in engineering time and CI minutes.

Everything, self-hosted

Everything, self-hosted

Widely used

TestNG Team · since 2004

Category standard

OSS community · since 2018

• Mature parallel-execution and grouping model, ideal for large Selenium suites.
• Data providers make data-driven testing straightforward.
• Test dependencies and ordering, which JUnit deliberately avoids.

• Tests survive refactors because they assert on user-visible output, not internals.
• Accessible-role queries push teams towards accessible markup as a side effect.
• One idiom across every major front-end framework.

• XML suite configuration is dated and error-prone.
• Test dependencies encourage ordering coupling that makes suites fragile.
• Community momentum favours JUnit 5 for new projects.

• Deliberately makes implementation-detail testing hard, which frustrates teams used to shallow rendering.
• Async utilities and act() warnings are a common source of confusion.
• Needs a runner and a DOM environment alongside it.

Java Selenium automation frameworks and large integration suites.

Any front-end team writing component tests, regardless of framework.