karma-coverage and requirejs not outputing coverage for files

So, what I'm facing is: The coverage report is coming out empty, it feels like it does not grab anything
under the ` {pattern: 'js/**/*.js', included: false, served: true},` I know this because I tried to use `*.js` to be preprocessed by the coverage and the only file it came out was the `test-main.js` (which isn't inside a patter object).

Tests are running, and passing.

What I'm thinking that's happening is that since the whole shebang is wrapped on a requirejs module, coverage doesn't understand it and never even sees the file - but I'm completly at loss on how to make karma-coverage understand it.

`karma.conf.js`

```js
// Karma configuration
// Generated on Wed Mar 29 2017 13:54:25 GMT+0100 (Hora de Verão de GMT)

module.exports = function(config) {
config.set({

// base path that will be used to resolve all patterns (eg. files, exclude)
basePath: '',

// frameworks to use
// available frameworks: https://npmjs.org/browse/keyword/karma-adapter
frameworks: ['jasmine', 'requirejs'],

// list of files / patterns to load in the browser
files: [
{pattern: 'lib/**/!(*Spec|spec|test).js', included: false},
{pattern: 'js/**/*.js', included: false, served: true},
{pattern: 'unit-testing/**/*.js', included: false},
'test-main.js',
],

// list of files to exclude
exclude: [],

reporters: ['dots', 'coverage'],

// preprocess matching files before serving them to the browser
// available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
preprocessors: {
'**/js/*.js': 'coverage'
},

// test results reporter to use
// possible values: 'dots', 'progress'
// available reporters: https://npmjs.org/browse/keyword/karma-reporter

coverageReporter: {
type : 'html',
dir : 'report/'
},

// web server port
port: 9876,

// enable / disable colors in the output (reporters and logs)
colors: true,

// level of logging
// possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
logLevel: config.LOG_INFO,

// enable / disable watching file and executing tests whenever any file changes
autoWatch: false,

// start these browsers
// available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
browsers: ['PhantomJS'],

// Continuous Integration mode
// if true, Karma captures browsers, runs the tests and exits
singleRun: true,

// Concurrency level
// how many browser should be started simultaneous
concurrency: Infinity
})
}
````

`test-main.js`

```js
var allTestFiles = []
var TEST_REGEXP = /(spec|test)\.js$/i

// Get a list of all the test files to include
Object.keys(window.__karma__.files).forEach(function (file) {
if (TEST_REGEXP.test(file)) {
// Normalize paths to RequireJS module names.
// If you require sub-dependencies of test files to be loaded as-is (requiring file extension)
// then do not normalize the paths
var normalizedTestModule = file.replace(/^\/base\/|\.js$/g, '')
allTestFiles.push(normalizedTestModule)
}
})

require.config({
// Karma serves files under /base, which is the basePath from your config file
baseUrl: '/base',

// dynamically load all test files
deps: allTestFiles,

paths: {
'angular': 'lib/angularjs/angular',
},

// we have to kickoff jasmine, as it is asynchronous
callback: window.__karma__.start
})
```

Start with karma.conf.js, comparing the files patterns and coverage preprocessor pattern, then trace how test-main.js loads RequireJS modules through window.__karma__.files. Run the existing Karma suite with coverage enabled and confirm that the JavaScript files under the intended pattern produce coverage output.

Written by the indexing model from the issue text.