add test to db connection for utf 16 handling

lib/snowflex/db_connection/result.ex

@@ -60,6 +60,7 @@ defmodule Snowflex.DBConnection.Result do
 
   defp handle_encoding(data) when is_list(data) do
     raw = :erlang.list_to_binary(data)
+
     case :unicode.characters_to_binary(raw) do
       utf8 when is_binary(utf8) -> utf8
       _ -> :unicode.characters_to_binary(raw, :latin1)

test/snowflex/db_connection_test.exs

@@ -29,6 +29,10 @@ defmodule Snowflex.DBConnectionTest do
       {:ok, %{}}
     end
 
+    def handle_call({:sql_query, "return_utf_16"}, _from, state) do
+      {:reply, {:ok, {:selected, ['col'], [{'CVS Pharmacy®'}]}}, state}
+    end
+
     def handle_call({:sql_query, "insert " <> _}, _from, state) do
       {:reply, {:ok, {:updated, 123}}, state}
     end
@@ -62,6 +66,14 @@ defmodule Snowflex.DBConnectionTest do
       assert {:ok, result} = SnowflakeDBConnection.execute("insert query")
       assert {:updated, 123} == SnowflakeDBConnection.process_result(result)
     end
+
+    test "should execute a sql query with utf-16 artifacts and scrub it" do
+      assert {:ok, %{rows: [{charlist}]}} = SnowflakeDBConnection.execute("return_utf_16")
+      # above we set this to return 'CVS Pharmacy®', as we saw in the real world, and then
+      # here we ensure that we just have the ® character
+      string = Enum.into(charlist, <<>>, fn bit -> <<bit>> end)
+      assert string == "CVS Pharmacy®"
+    end
   end
 
   describe "execute/2" do