Refactor async messenger spec

spec/cellular/jobs/async_messenger_spec.rb

@@ -4,21 +4,22 @@
   let(:sms_stub)    { double "SMS", deliver: true }
   let(:sms_options) { { "recipient" => "12345678", "text" => "Foo" } }
 
+  before do
+    allow(Cellular::SMS).to receive(:new).and_return sms_stub
+  end
+
   it 'creates a new SMS object' do
     symbolized_sms_options = { recipient: "12345678", text: "Foo" }
 
-    expect(Cellular::SMS).to receive(:new)
-      .with(symbolized_sms_options)
-      .and_return sms_stub
-
     subject.perform sms_options
+
+    expect(Cellular::SMS).to have_received(:new)
+      .with(symbolized_sms_options)
   end
 
   it "delivers the SMS" do
-    allow(Cellular::SMS).to receive(:new).and_return sms_stub
-
-    expect(sms_stub).to receive :deliver
-
     subject.perform sms_options
+
+    expect(sms_stub).to have_received :deliver
   end
 end