collect_file

# File lib/test/unit/collector/dir.rb, line 84
        def collect_file(name, suites, already_gathered)
          dir = @file.dirname(@file.expand_path(name, @base))
          $:.unshift(dir)
          if(@req)
            @req.require(name)
          else
            require(name)
          end
          find_test_cases(already_gathered).each{|t| add_suite(suites, t.suite)}
        ensure
          $:.delete_at($:.rindex(dir)) if(dir)
        end