Tests basic correctness of ES Set's clear() API On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS stringSet.size is 0 PASS stringSet.values.length is 0 PASS stringSet.has('Oliver') is false PASS stringSet.has('Benjamin') is false PASS valueSet.size is 0 PASS valueSet.values.length is 0 PASS valueSet.has(0) is false PASS valueSet.has(1) is false PASS objectSet.size is 0 PASS objectSet.values.length is 0 PASS objectSet.has(anArray) is false PASS objectSet.has(anObject) is false PASS objectSet.has(otherObject) is false PASS mixedTypeSet.size is 0 PASS mixedTypeSet.values.length is 0 PASS mixedTypeSet.has(0) is false PASS mixedTypeSet.has('Oliver') is false PASS mixedTypeSet.has(stringSet) is false PASS mixedTypeSet.has(valueSet) is false PASS mixedTypeSet.has(objectSet) is false PASS mixedTypeSet.has(anObject) is false PASS successfullyParsed is true TEST COMPLETE