         File.write!(File.join(dest, "a"), "hello")
         assert File.cp_r(src, dest) == { :error, :enotdir }
       after
-        System.cmd "rm -rf #{dest}"
+        File.rm_rf dest
       end
     end
 

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


        end) == :ok
        assert File.read!(dest) == "hello"
      after
        File.rm_rf dest
      end
    end

