Use grunt connect to make the karma test coverage directory browseable.

gistfile1.txt

coverage: {
    options: {
      // required for output on index.html base filepath
      base: __dirname + 'test/coverage/',
      // required to override base to make the directory browseable
      directory: __dirname + 'test/coverage/',
      port: '5555',
      keepalive: true
    }
}