Rust-Analyzer's "Run test" buttons don't work

[japaric]

The #[test] attribute is picked up by Rust-Analyzer so RA shows "Run Test" buttons but you get an error if you try to use.
Those button will invoke cargo test --package testsuite --test test -- tests::assert_true --exact --nocapture which then invokes passes the tests::assert_true --exact --nocapture arguments to probe-run.
probe-run will fail to run as it doesn't recognize those command line arguments.
Interestingly the mod tests module is also picked up by RA so it also gets a "Run Test" button; that one also fails to run.