cargo-stress

A utility for catching non-deterministic test failures. It runs tests in parallel in a loop and collects failures.

cargo-stress is modeled after the stress binary we use at CockroachDB, which is itself a fork of Go's x/tools/cmd/stress.

cargo stress can be installed with cargo install. The resulting binary should then be in $HOME/.cargo/bin.

$ cargo install cargo-stress

Use it to run your tests as fast as possible:

$ cargo stress
Compiling test binaries: cargo test --no-run --message-format=json
    Finished dev [unoptimized + debuginfo] target(s) in 0.01s
Running test binary: "cargo-stress/target/debug/cargo_stress-e02dca1c9609c365"
1 runs so far, 0 failures, over 0s
5092 runs so far, 0 failures, over 5s
10226 runs so far, 0 failures, over 10s
15455 runs so far, 0 failures, over 15s
...

Flags and usage

Cargo is used to build the test binary, which is then invoked repeatedly. By default, it runs the same tests as cargo test but this can be controlled via flags. It is intended that any cargo test command can be replaced by cargo stress and the same tests will be run with the same arguments. Any other behavior is a bug. It's likely I didn't get this quite right, so please file issues if you see this.