Run Rust tests with cargo test: filter by name, show output, control parallelism, doc-tests
domain: doc.rust-lang.org · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Run `cargo test` to build and run all unit tests, integration tests (tests/ dir), and doc-tests.
Filter by substring: `cargo test parse` runs every test whose name contains 'parse'.
Flags after `--` go to the test harness, not cargo: `cargo test -- --show-output` prints stdout of passing tests; `cargo test -- --test-threads=1` disables parallel test execution.
Scope selection: `cargo test --lib` (unit tests only), `cargo test --test <name>` (one integration test target), `cargo test --doc` (doc-tests only), `cargo test --workspace` (all workspace members).
Test stdout is captured by default and only shown for failures; use `-- --show-output` for passing-test output. The old `--nocapture` harness flag is now spelled `--no-capture` on current toolchains.
Tests run in parallel by default — tests sharing files, ports, env vars, or a database will flake until you isolate them or use `-- --test-threads=1`.
Integration tests live in tests/ as separate crates: they can only call your crate's public API, and each file is compiled as its own binary.
Doc-tests compile every ``` code block in doc comments; mark blocks ```no_run (compile only) or ```ignore to skip.
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