Upgrade to phoenix 1.5

test/support/data_case.ex

@@ -45,8 +45,8 @@ defmodule TeslaMate.DataCase do
   """
   def errors_on(changeset) do
     Ecto.Changeset.traverse_errors(changeset, fn {message, opts} ->
-      Enum.reduce(opts, message, fn {key, value}, acc ->
-        String.replace(acc, "%{#{key}}", to_string(value))
+      Regex.replace(~r"%{(\w+)}", message, fn _, key ->
+        opts |> Keyword.get(String.to_existing_atom(key), key) |> to_string()
       end)
     end)
   end