run test in separate file

Author: coke

doc/Language/variables.pod6

@@ -1198,7 +1198,7 @@ files in the distribution by their original relative path names, or to view the
 metadata, without needing to know the underlying file structure (such as how
 C<CompUnit::Repository::Installation> changes the file layout on installation).
 
-=begin code
+=begin code :solo
 unit module MyFoo;
 
 sub module-version {