tests: test: ensure whitespace ignored when parsing numbers

* tests/test/test.pl: Add a test case.

tests/test/test.pl

@@ -161,6 +161,7 @@ my @Tests =
   ['eq-4', qw(8 -eq 9), {EXIT=>1}],
   ['eq-5', qw(1 -eq 0), {EXIT=>1}],
   ['eq-6', "$limits->{UINTMAX_OFLOW} -eq 0", {EXIT=>1}],
+  ['eq-7', qw(0 -eq ' 0 ')],
 
   ['gt-1', qw(5 -gt 5), {EXIT=>1}],
   ['gt-2', qw(5 -gt 4)],