Found my answer at: https://github.com/Microsoft/vscode/issues/2167

You have to pass the arguments as individual string elements:

“args”: [

“–test”, “buildOutput/JavaScript1.js”,

“–env”, “devtest-chrome-win8”

]

My program needed a parameter -d and a parameter -s, so I changed the args to:

“args”: [

“-d”, “some value for d”,

“-s”, “some value for s”

]

And those parameters where picked up by the McMaster.Extensions.CommandLineUtils, that I used in the program.