TestNG vs xUnit.net
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free and open source
Open sourceFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
Free and open source. You pay in engineering time and CI minutes.
Free tier
Everything, self-hosted
Everything, self-hosted
Open source
Apache-2.0
Apache-2.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
TestNG Team · since 2004
Category standard
.NET Foundation · since 2007
Strengths
- 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.
- Per-test instance isolation eliminates a whole class of shared-state bugs by design.
- Idiomatic modern C# — no attribute soup.
- The default in current .NET project templates.
Limitations
- 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.
- Fewer built-in assertions than NUnit; most teams add FluentAssertions.
- The isolation model surprises developers migrating from NUnit.
- Parallelism defaults occasionally bite on integration tests.
Best for
Java Selenium automation frameworks and large integration suites.
New .NET projects.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.