mail not whitelisted when not set

test/basic_signup_whitelist_test.exs

@@ -2,7 +2,7 @@ defmodule BasicSignupWhitelistTest do
   use ExUnit.Case
   doctest BasicSignupWhitelist
 
-  test "greets the world" do
-    assert BasicSignupWhitelist.hello() == :world
+  test "When not set, not whitelisted" do
+    assert BasicSignupWhitelist.mail_whitelisted("joe@example.com") == false
   end
 end