GoogleTest vs Rust libtest

GoogleTest is Google’s free C++ framework for testing and mocking on Linux, macOS, and Windows. Built on the xUnit architecture, it supports many kinds of C++ tests rather than only unit tests and discovers tests automatically without manual registration. Assertions cover equality, inequality, exceptions, and other conditions, with support for user-defined assertions. The framework includes fatal and non-fatal failures, death tests, and value-parameterized and type-parameterized cases. Developers can run individual tests, choose an order, or execute tests in parallel. Quickstarts cover Bazel and CMake, and pkg-config files help compile and link GoogleTest and GoogleMock. Documentation includes primers, advanced topics, mocking guides, FAQs, references, samples, and community material. The 1.18.x branch requires at least C++17. GoogleTest follows Google’s Foundational C++ Support Policy and publishes supported compiler, platform, and build-tool versions. It uses the BSD-3-Clause license, permitting redistribution under its conditions.

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.