tests: use `test -f` instead of `ls` to see if a file is present (issue6662)
ls's exit code when file doesn't exist is 2 on Linux and 1 on NetBSD, so let's
use something that's supposedly more portable, since we only care whether the
file is there or not.
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}