Chai uses re.exec when it tests a regular expression re. This regular expression matches '000' and its lastIndex is set to 3 (because the g flag is set). The next test calls re.exec('110'). The match starts from the new lastIndex position and it fails.
There is something weird indeed with the tests, if you only leave that one in the sample tests, your code passes it. But, your code is not ok, and it returns true for any combination of 0 and 1 with 3 digits.
The regular expression should not use the
gflag.Chai uses
re.execwhen it tests a regular expressionre. This regular expression matches'000'and itslastIndexis set to3(because thegflag is set). The next test callsre.exec('110'). The match starts from the newlastIndexposition and it fails.There is something weird indeed with the tests, if you only leave that one in the sample tests, your code passes it. But, your code is not ok, and it returns true for any combination of 0 and 1 with 3 digits.
No, they are not identical: