zunit is a zero-dependency, single-file test runner for Java 25 that discovers *Test.java files and runs them directly via `java --source 25`. No compilation step, no JUnit, and no build tool are required. Each test is a self-contained script with a `void main()` method, and each test gets its own JVM for full execution isolation. It supports auto-detection of tests, explicit classpath configuration, and integration with the zb build tool.
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