Remove tests

test/support/fixtures/users_fixtures.ex

@@ -1,20 +0,0 @@
-defmodule Nulla.UsersFixtures do
-  @moduledoc """
-  This module defines test helpers for creating
-  entities via the `Nulla.Users` context.
-  """
-
-  @doc """
-  Generate a user.
-  """
-  def user_fixture(attrs \\ %{}) do
-    {:ok, user} =
-      attrs
-      |> Enum.into(%{
-        username: "some username"
-      })
-      |> Nulla.Users.create_user()
-
-    user
-  end
-end