testcafe: Unable to find the browser

Are you requesting a feature or reporting a bug?

a bug

What is the current behavior?

run my test in browserstack, but the CLI dont found the name of browser. I’m trying use the browser browserstack:chrome@56.0:OS X Sierra The cli return the following error

Error Unable to find the browser. "browserstack:chrome@56.0:OS" is not a browser alias or path to an executable file

note, only for the first space, missing the " X Sierra", problably a error on parse values from process.argv