I spent ages working through a combination of Webpack, sinon, IE8 and mocha when getting the test suite working in SauceLabs - those technologies really didn't want to place nicely together. In the end I managed to get sinon, Ie8 and mocha playing nicely at the expense of dropping Webpack for Browserify. It'd be good to go back and get webpack working.
I spent ages working through a combination of Webpack, sinon, IE8 and mocha when getting the test suite working in SauceLabs - those technologies really didn't want to place nicely together. In the end I managed to get sinon, Ie8 and mocha playing nicely at the expense of dropping Webpack for Browserify. It'd be good to go back and get webpack working.