This test ensures that regeular expression literals are constants, and so persist over multiple executions On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS currentRegExp === lastRegExp is false PASS currentRegExp === lastRegExp is false PASS returnRegExpLiteral() === returnRegExpLiteral() is false PASS returnConditionalRegExpLiteral(true) === returnConditionalRegExpLiteral(true) is false PASS returnConditionalRegExpLiteral(false) === returnConditionalRegExpLiteral(false) is false PASS returnConditionalRegExpLiteral(true) === returnConditionalRegExpLiteral(false) is false PASS returnRegExpLiteral().someAddedProperty is undefined. PASS successfullyParsed is true TEST COMPLETE