Add a --test-threads option for rustc test binaries

[jimmycuadra]

Discussion carried over from: rust-lang/cargo#1591

Test binaries created by rustc should have a --test-threads option instead of (in addition to?) controlling the thread count with RUST_TEST_THREADS. It's not a consistent user experience to have some functionality controlled via environment variables and some via command line options. CLI options should be preferred since they encourage users to keep configuration local to a single execution of a test binary and not export it globally, making it affect other test runs perhaps accidentally. It would also make the output of test_binary -h more uniform and compact.

[brson]

Agreed.

[nixpulvis]

The ability to specify this in the Cargo.toml somehow might be nice. One of my crates I'm working on needs all the tests run like this.

[steveklabnik]

It is already set table by an env var, no? Cargo just can't specify them. So still not ideal but might work in the meantime.

On Apr 16, 2016, 19:05 -0400, Nathan Lilienthalnotifications@github.com, wrote:

The ability to specify this in theCargo.tomlsomehow might be nice. One of my crates I'm working on needs all the tests run like this.

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[nixpulvis]

@steveklabnik Oh cool thanks, I'll set that in my project.