     end
   end
 
-  test "trim" do
+  test "trim/1,2" do
     assert String.trim("") == ""
     assert String.trim("  abc ") == "abc"
     assert String.trim("a  abc  a\n\n") == "a  abc  a"

    end
  end

  test "slice" do
    assert String.slice("elixir", 1, 3) == "lix"
    assert String.slice("あいうえお", 2, 2) == "うえ"
    assert String.slice("ειξήριολ", 2, 3) == "ξήρ"

    end
  end

  test "reverse/1" do
    assert String.reverse("") == ""
    assert String.reverse("abc") == "cba"
    assert String.reverse("Hello World") == "dlroW olleH"
