Fixed development access token generation bug

lib/mix/tasks/token.ex

@@ -62,17 +62,17 @@ defmodule Mix.Tasks.Cadet.Token do
     if Cadet.Env.env() in @env_allow_mock do
       user =
         User
-        |> where(role: ^role)
+        |> join(:inner, [u], cr in "course_registrations", on: u.id == cr.user_id)
+        |> where([u, cr], cr.role == ^role)
         |> first
         |> Repo.one()
 
       if user do
         user
       else
         role_capitalized = String.capitalize("#{role}")
-
         %User{}
-        |> User.changeset(%{name: "Test#{role_capitalized}", role: role})
+        |> User.changeset(%{name: "Test#{role_capitalized}", username: "test_#{role}", provider: "test"})
         |> Repo.insert!()
       end
     end