Test for error messages for in On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS 20 in 'in in in' threw exception TypeError: "in in in" is not an Object. (evaluating '20 in 'in in in''). PASS 20 in true threw exception TypeError: true is not an Object. (evaluating '20 in true'). PASS 20 in {}.foo threw exception TypeError: {}.foo is not an Object. (evaluating '20 in {}.foo'). PASS 20 in 20 threw exception TypeError: 20 is not an Object. (evaluating '20 in 20'). PASS 20 in null threw exception TypeError: null is not an Object. (evaluating '20 in null'). PASS successfullyParsed is true TEST COMPLETE