Extract observation of User to a UserObserver

spec/models/user_observer_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe UserObserver do
+  subject { UserObserver.instance }
+
+  it 'calls #after_create when new users are created' do
+    new_user = Factory.new(:user)
+    subject.should_receive(:after_create).with(new_user)
+
+    User.observers.enable :user_observer do
+      new_user.save
+    end
+  end
+
+  context 'when a new user is created' do
+    let(:user) { double(:user, id: 42, password: 'P@ssword!') }
+    let(:notification) { double :notification }
+
+    it 'sends an email' do
+      notification.should_receive(:deliver)
+      Notify.should_receive(:new_user_email).with(user.id, user.password).and_return(notification)
+
+      subject.after_create(user)
+    end
+  end
+end