fullTrace not working?

[ehartford]

I tried adding this to my Karma config

client: {
  mocha: {
    fullTrace: true
  }
},

however, I am still not getting any stacktrace when an assertion fails.

PhantomJS 2.1.1 (Mac OS X 0.0.0) Common #range_to_string() handles bad input FAILED
Unspecified AssertionError

So I know which test it is on but not which assertion failed. How can I Get the line number to display?

[maksimr]

@ehartford karma-mocha does not support this options now.

Pull Request are welcome

Thanks