code: function prepareBuckets() {
              return INTEGRATION_TESTS.map(function (bucket) {
                  return bucket.map(function (test) {
                      if (typeof test === 'object') {
                          return test;
                      }
  
                      return {
                          file: test,
                          serverArgs: ''
                      };
                  });
              });
          }
docs: Prepares files for consumption by casper. Input given
  as array of buckets, buckets being array of strings (file names) or
  objects (filename + custom server args). Converts strings to objects
  with { file: originalString, serverArgs: '' }
  
  @method prepareBuckets
  @returns {Array<Array<Object>>} modified buckets
  @example
  input:
  [
  [ 'file1', 'file2' ],
  [ 'file3', { file: 'file4', serverArgs: '--something' } ]
  ]
  
  output:
  [
  [ { file: 'file1', serverArgs: '' }, { file: 'file2', serverArgs: '' } ],
  [ { file: 'file3', serverArgs: '' }, { file: 'file4', serverArgs: '--something' } ]
  ]