Go testing vs Rust libtest

Go testing is the testing toolkit built into Go, an open-source programming language supported by Google. Developers run it with the `go test` command and `testing` package. It discovers test functions named `TestXXX` in files ending in `_test.go`; adding `-v` displays tests and their results. The standard toolchain also supports native fuzzing, which varies inputs to help find bugs, as well as benchmarking and profiling. The race detector can be enabled with `go test -race`, though it detects races only in code paths exercised during a run. For vulnerability checks, `govulncheck` identifies known issues affecting code and prioritizes them according to whether vulnerable functions or methods are called. Its JSON output can feed CI/CD systems, and the Go team provides a GitHub Action. Go is free and has releases for Linux, macOS, and Windows, along with source archives and other ports. Its cryptography libraries can be used in FIPS 140-3 compliant mode. The language is used for cloud and network services, command-line interfaces, web development, DevOps, and site reliability engineering.

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.