Module doesn't load correctly when run through Karma in environments that aren't browsers. Window variable is not defined.

[Astridax]

The global window variable doesn't necessarily exist in all environments, for example Nativescript where Karma runs tests in a non-browser environment.

Offending code:

if (typeof module !== 'undefined' && module.exports) {
  module.exports = setup;
} else if (window.sinon) {
  setup(window.sinon);
}

Proposed change

if (typeof module !== 'undefined' && module.exports) {
  module.exports = setup;
} else if (typeof window !== 'undefined') {
    if(typeof window.sinon !== 'undefined') setup(window.sinon);
} else {
    if(typeof this.sinon !== 'undefined') setup(this.sinon);
}

I have implemented a code fix that I will submit as a pull request soon.

[a-b-r-o-w-n]

Sounds good. Look forward to the PR.