Require valid invitation to start sign-up process

spec/models/user_spec.rb

@@ -20,4 +20,12 @@ RSpec.describe User, type: :model do
       expect(user.is_admin?).to be false
     end
   end
+
+  describe "#address" do
+    let(:user) { build :user, cn: "jimmy", ou: "kosmos.org" }
+
+    it "returns the user address" do
+      expect(user.address).to eq("jimmy@kosmos.org")
+    end
+  end
 end