function assertCSSTextEquals(expectedCssText, actualCssText) {
  assertEquals(
      getStyleFromCssText(expectedCssText).cssText,
      getStyleFromCssText(actualCssText).cssText);
}
Asserts that the expected CSS text is equal to the actual CSS text.
@param {string} expectedCssText Expected CSS text.
@param {string} actualCssText Actual CSS text.