PHPUnit vs Rust libtest

PHPUnit is a free testing framework for PHP, with a command-line runner for running tests and selecting test suites. It covers assertions for return values, exceptions, side effects, output, files, JSON, XML, and error-log output. Tests can be organized through filesystem structure or XML configuration and can use data providers, dependencies, stubs, and mock objects. The framework documents code coverage reports in HTML and JSONL formats, plus JUnit and TeamCity logging configuration. For tests that fail intermittently, PHPUnit supports repeating and retrying runs through attributes and command-line options. Installation is available as a PHAR or as a Composer development dependency. PHPUnit 13 is the current stable major version and requires PHP 8.4 or later. Bug-fix support for that version runs through February 4, 2028; its end-of-life date is undetermined. Documentation is available for versions 8.5 through 13.4. PHPUnit supports Linux, macOS, Windows, and self-hosted use.

Rust libtest is Rust’s built-in test harness for compiling and running crate tests. Building with `rustc --test` links the executable to libtest; tests are free functions marked `#[test]`. Cargo’s `cargo test` handles building and running unit, integration, and documentation tests, including code samples extracted from library documentation comments. A test succeeds when it returns without an error; a panic or non-zero termination result marks failure. You can mark tests to expect a panic or to be ignored, filter by name, choose exact matches, skip matches, select ignored tests, or list tests and benchmarks without running them. Tests run in parallel by default, with the thread count configurable. The harness can capture output, display successful-test output, and format results as pretty, terse, or JSON; JSON formatting is unstable. Rust libtest is free and supports Linux, macOS, and Windows. Catching panics requires the unwind strategy; abort-strategy support is experimental. Benchmarking and custom harnesses are experimental and nightly-only.