Stub ::Devise.mailer for great justice. And/or fewer strange arity errors.

spec/models/user/invite_spec.rb

@@ -13,17 +13,27 @@ describe User do
   let(:invited_user3) { create_user_with_invitation("abc", :email => "email@example.com", :inviter => inviter_with_3_invites)}
 
   context "creating invites" do
-    it 'should invite the user' do
-      pending "weird wrong number of arguments error (0 for 2), which changes if you put in two args"
-      #User.should_receive(:invite!).and_return(invited_user)
-      inviter.invite_user(:email => "email@example.com")
+    before do
+      deliverable = Object.new
+      deliverable.stub!(:deliver)
+      ::Devise.mailer.stub!(:invitation).and_return(deliverable)
     end
 
-    it 'should add the inviter to the invited_user' do
-      User.should_receive(:invite!).and_return(invited_user)
-      invited_user = inviter.invite_user(:email => "email@example.com")
+    it 'creates a user' do
+      lambda {
+        inviter.invite_user(:email => "joe@example.com")
+      }.should change(User, :count).by(1)
+    end
+
+    it 'sends email to the invited user' do
+      ::Devise.mailer.should_receive(:invitation).once
+      inviter.invite_user(:email => "ian@example.com")
+    end
+
+    it 'adds the inviter to the invited_user' do
+      invited_user = inviter.invite_user(:email => "marcy@example.com")
       invited_user.reload
-      invited_user.inviters.include?(inviter).should be true
+      invited_user.inviters.include?(inviter).should be_true
     end
   end