add failing test

Author: ruslandoga

test/mint/http1/request_test.exs

@@ -42,6 +42,11 @@ defmodule Mint.HTTP1.RequestTest do
       assert Request.encode("GET", "/", [{"foo", "bar\r\n"}], nil) ==
                {:error, {:invalid_header_value, "foo", "bar\r\n"}}
     end
+
+    test "empty target" do
+      assert Request.encode("GET", "", [], nil) ==
+               {:error, {:invalid_target, ""}}
+    end
   end
 
   describe "encode_chunk/1" do