defmodule BasicSignupWhitelistTest do
  use ExUnit.Case
  doctest BasicSignupWhitelist

  defp allow_signups_for(whitelist) do
    System.put_env("SIGNUP_ALLOWED_EMAILS", whitelist)
  end

  setup do
    # Save original env var
    original_env = System.get_env("SIGNUP_ALLOWED_EMAILS")

    on_exit(fn ->
      # Restore original env var after each test
      case original_env do
        nil -> System.delete_env("SIGNUP_ALLOWED_EMAILS")
        value -> System.put_env("SIGNUP_ALLOWED_EMAILS", value)
      end
    end)

    :ok
  end

  test "When not set, not whitelisted" do
    System.delete_env("SIGNUP_ALLOWED_EMAILS")
    refute BasicSignupWhitelist.mail_whitelisted("joe@example.com")
  end

  test "When set to star, whitelisted" do
    allow_signups_for("*")
    assert BasicSignupWhitelist.mail_whitelisted("joe@example.com")
  end
end