let check = (resultSet, subKey) => {
  depth++;
  // If there's no _meta, we need to recurse further
  if (!resultSet._meta) {
    leftLog(depth, '-', colors.underline.white(`${subKey}`));
    Object.keys(resultSet).forEach(key => check(resultSet[key], key));
    depth--;
    return;
  }
  // If there's no reference property, this was the first time we saw this key
  // So we need to check with the user to ensure that this is the right value
  if (!resultSet.hasOwnProperty('reference')) {
    leftLog(depth, colors.red(`X ${subKey}: No reference value found`));
    // Not using template functions here so we're not calling .toString on objects
    leftLog(depth + 1, colors.grey('Latest result:'), resultSet.current);
    if (keyInYNStrict('Use this value?')) {
      resultSet.reference = resultSet.current;
    }
  }

  // If there is a reference property (checked above) and no current, then the test passed
  // Move along, nothing to see here
  if (!resultSet.hasOwnProperty('current')) {
    leftLog(depth, `${greenCheckmark} ${subKey}`);
    depth--;
    return;
  }


  // If there are both current & reference properties, we need to ensure they match
  // If not, a test failed and the user probably wants to update the value there
  try {
    deepStrictEqual(resultSet.reference, resultSet.current);

    leftLog(depth, `${greenCheckmark} ${subKey}`);
  } catch (e) {
    leftLog(depth, colors.red(`X ${subKey}: Values don't match`));
    // Not using template functions here so we're not calling .toString on objects
    leftLog(depth + 1, colors.grey('Reference value:'), resultSet.reference);
    leftLog(depth + 1, colors.grey('Latest result:'), resultSet.current);
    if (keyInYNStrict('Should I replace this?')) {
      resultSet.reference = resultSet.current;
      delete resultSet.current;
    }
  }
  depth--;
};

function applyColor(message: string, color: Color): string {
    if (!message) return;
    if (!color) return message;

    switch (color) {
        case Color.black:   return colors.black(message);
        case Color.red:     return colors.red(message);
        case Color.green:   return colors.green(message);
        case Color.yellow:  return colors.yellow(message);
        case Color.blue:    return colors.blue(message);
        case Color.magenta: return colors.magenta(message);
        case Color.cyan:    return colors.cyan(message);
        case Color.white:   return colors.white(message);
        case Color.grey:    return colors.grey(message);
        default:            throw new Error('Invalid Color');
    }
}

            }, function (err) {
                if (err) {
                    return next(err)
                }

                console.log('\n')
                if (totalPassing > 0) {
                    console.log(colors.green(totalPassing + ' passing ') + colors.grey('(' + totalTime + 's)'))
                }
                if (totalFailing > 0) {
                    console.log(colors.red(totalFailing + ' failing'))
                }
                console.log('')

                errors.forEach((error, index) => {
                    console.log('  ' + (index + 1) + ') ' + error.context + ' ' + error.value)
                    console.log('')
                    console.log(colors.red('\t error: ' + error.errMsg))
                })
                console.log('')

                next()
            })

 .map(tap(_ => console.log(green('We wrote ') + grey(self.outputFile))));