Test how setCustomValidity reacts to too few arguments. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS b.setCustomValidity() threw exception TypeError: Not enough arguments. PASS fs.setCustomValidity() threw exception TypeError: Not enough arguments. PASS i.setCustomValidity() threw exception TypeError: Not enough arguments. PASS k.setCustomValidity() threw exception TypeError: k.setCustomValidity is not a function. (In 'k.setCustomValidity()', 'k.setCustomValidity' is undefined). PASS successfullyParsed is true TEST COMPLETE