1 Checks that an exception is thrown when a dictionary value cannot be converted to a String
3 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
6 PASS new MessageEvent('message', {origin: 'test'}).origin is "test"
7 PASS new MessageEvent('message', {origin: 2}).origin is "2"
8 PASS new MessageEvent('message', {origin: nonConvertibleToString}) threw exception Exception in toString().
9 PASS successfullyParsed is true