def testCssOneRulePerLine(self):
    self.VerifyContentsProducesOutput("\na:not([hidden]):not(.custom-appearance):not([version=1]):first-of-type,\na:not([hidden]):not(.custom-appearance):not([version=1]):first-of-type ~\n    input[type='checkbox']:not([hidden]),\ndiv {\n  background: url(chrome://resources/BLAH);\n  rule: value; /* rule: value; */\n  rule: value; rule: value;\n}\n", '\n- One rule per line (what not to do: color: red; margin: 0;).\n    rule: value; rule: value;')
def testCssOneRulePerLine(self):
    self.VerifyContentsProducesOutput("\na:not([hidden]):not(.custom-appearance):not([version=1]):first-of-type,\na:not([hidden]):not(.custom-appearance):not([version=1]):first-of-type ~\n    input[type='checkbox']:not([hidden]),\ndiv {\n  background: url(chrome://resources/BLAH);\n  rule: value; /* rule: value; */\n  rule: value; rule: value;\n}\n", '\n- One rule per line (what not to do: color: red; margin: 0;).\n    rule: value; rule: value;')