function seletorToTerms(selector) {
  return selector
    .replace(/\s*&\s*/g, '&') // remove all whitespace around joins
    .split(/\s+/);
}

function termToCssSelector(term) {
  return term ? '[data-test-subj~="' + term + '"]' : '';
}

module.exports = function testSubjSelector(selector) {
  const cssSelectors = [];
  const terms = seletorToTerms(selector);

  while (terms.length) {
    const term = terms.shift();
    // split each term by joins/& and map to css selectors
    cssSelectors.push(
      term
        .split('&')
        .map(termToCssSelector)
        .join('')
    );
  }

  return cssSelectors.join(' ');
};