Preprocessors in `unit-coverage` break when present in karma.conf too

[pulkitsinghal]

My karma-unit.conf.js file which started-off this seed, now looks like:

    files: [
      ...
      'app/views/*.html'
    ],
    preprocessors: {
      'app/views/*.html': ['ng-html2js']
    },
    ngHtml2JsPreprocessor: {
      moduleName: 'views',
      stripPrefix: 'app/'
    }

I was running grunt:karma:unitCoverage and I kept getting errors like:

Chrome 32.0.1700 (Mac OS X 10.9.2) ERROR
    Uncaught SyntaxError: Unexpected token <
    at /Users/myUsername/dev/nyApp/app/views/home.html:1

After much trial and error I figured out the way to fix this was to embellish the Gruntfile.js with the preprocessor that had been sitting in karma-unit.conf.js:

    karma: {
      unitCoverage: {
        configFile: './test/karma-unit.conf.js',
        preprocessors: {
          'app/scripts/*.js': ['coverage'], 
          'app/views/*.html': ['ng-html2js'] // had to be repeated here
        }

Is this because the preprocessor block is getting overridden?

Another suggestion is to alter the seed such that subdirectories would be covered too:

        preprocessors: {
          //'app/scripts/*.js': ['coverage'], // original
          'app/scripts/**/*.js': ['coverage'], // may be a nicer default
          'app/views/*.html': ['ng-html2js']
        }