+my $glob2re = $cls->can('glob2re');
+is($glob2re->('http://[::1]:1234/foo/'), undef, 'IPv6 URL not globbed');
+is($glob2re->('foo'), undef, 'plain string unchanged');
+is_deeply($glob2re->('[f-o]'), '[f-o]' , 'range accepted');
+is_deeply($glob2re->('*'), '[^/]*?' , 'wildcard accepted');
+is_deeply($glob2re->('{a,b,c}'), '(a|b|c)' , 'braces');
+is_deeply($glob2re->('{,b,c}'), '(|b|c)' , 'brace with empty @ start');
+is_deeply($glob2re->('{a,b,}'), '(a|b|)' , 'brace with empty @ end');
+is_deeply($glob2re->('{a}'), undef, 'ungrouped brace');
+is_deeply($glob2re->('{a'), undef, 'open left brace');
+is_deeply($glob2re->('a}'), undef, 'open right brace');
+is_deeply($glob2re->('*.[ch]'), '[^/]*?\\.[ch]', 'suffix glob');
+is_deeply($glob2re->('{[a-z],9,}'), '([a-z]|9|)' , 'brace with range');
+is_deeply($glob2re->('\\{a,b\\}'), undef, 'escaped brace');
+is_deeply($glob2re->('\\\\{a,b}'), '\\\\\\\\(a|b)', 'fake escape brace');
+