controllers with rspec3 syntax

spec/controllers/admin/screened_emails_controller_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 describe Admin::ScreenedEmailsController do
   it "is a subclass of AdminController" do
-    (Admin::ScreenedEmailsController < Admin::AdminController).should == true
+    expect(Admin::ScreenedEmailsController < Admin::AdminController).to eq(true)
   end
 
   let!(:user) { log_in(:admin) }
@@ -13,10 +13,10 @@ describe Admin::ScreenedEmailsController do
     end
 
     subject { response }
-    it { should be_success }
+    it { is_expected.to be_success }
 
     it 'returns JSON' do
-      ::JSON.parse(subject.body).should be_a(Array)
+      expect(::JSON.parse(subject.body)).to be_a(Array)
     end
   end
 end