         assert File.mkdir!(fixture) == :ok
         assert File.exists?(fixture)
       after
-        System.cmd("rm -rf #{fixture}")
+        File.rmdir fixture
       end
     end
 

        end) == :ok
        assert File.read!(dest) == "hello"
      after
        System.cmd "rm -rf #{dest}"
      end
    end


        assert File.exists?(base)
        assert File.exists?(fixture)
      after
        File.rm_rf base
      end
    end

