npm test fails with a preprocessor.js parse error

[AfzalivE]

 ❯❯❯ npm test                                                                                        ◼

> web-demo@0.0.0 test /Users/afzal/Dev/Kiwi/web-demo
> jest

Using Jest CLI v0.4.5
 FAIL  app/scripts/ui/__tests__/Timer-test.coffee
Error: /Users/afzal/Dev/Kiwi/web-demo/preprocessor.js: Parse Error: Line 3: Unexpected string
1 test failed, 0 tests passed (1 total)
Run time: 0.278s
npm ERR! Test failed.  See above for more details.

My preprocessor.js is unchanged, here it is for reference:

var ReactTools = require('react-tools');
module.exports = {
    process: function(src) {
        return ReactTools.transform(src, {
            harmony: true
        });
    }
};

[randylien]

I think the problem is current task doesn't compile CoffeeScript before run jest.
Let me think how to fix it.