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De facto Python testing framework with plain asserts, powerful fixtures and 1,000+ plugins.

Standard Java testing framework; JUnit 6 unified versioning and requires Java 17+.

Modern, community-focused unit testing framework for .NET and the default in many new C# projects.

Mature, attribute-driven .NET unit testing framework with rich assertions and parameterized tests.

Head to head

Metric	pytest	JUnit	xUnit.net	NUnit
Stars	14.7k	7.1k	4.6k	2.6k
Weekly downloads	233M	n/a	n/a	n/a
Download growth	+24%	n/a	n/a	n/a
Popularity score	89/100	70/100	67/100	62/100
Forks	3.6k	1.7k	844	770
Open issues	930	113	16	280
Last commit	4d ago	today	3d ago	1d ago
Latest version	9.2.0Oct 27, 2026	n/a	n/a	n/a
License	MIT	EPL-2.0	n/a	MIT
First released	2015	2015	2013	2013
Signals	Popular	Popular	Popular	None
Listed in	Testing & QA › Unit Testing: Python, JVM, .NET, Go & More	Testing & QA › Unit Testing: Python, JVM, .NET, Go & More	Testing & QA › Unit Testing: Python, JVM, .NET, Go & More	Testing & QA › Unit Testing: Python, JVM, .NET, Go & More

Weekly downloads over time

Hover for exact values; switch to log scale for tools of very different sizes. Not shown (no comparable download data): JUnit, xUnit.net, NUnit.