Improve QA test scenario entrypoint specs

qa/spec/scenario/entrypoint_spec.rb

@@ -6,23 +6,23 @@ describe QA::Scenario::Entrypoint do
   end
 
   context '#perform' do
-    let(:config) { spy('Specs::Config') }
+    let(:arguments) { spy('Runtime::Scenario') }
     let(:release) { spy('Runtime::Release') }
     let(:runner) { spy('Specs::Runner') }
 
     before do
-      allow(config).to receive(:perform) { |&block| block.call config }
-      allow(runner).to receive(:perform) { |&block| block.call runner }
-
-      stub_const('QA::Specs::Config', config)
       stub_const('QA::Runtime::Release', release)
+      stub_const('QA::Runtime::Scenario', arguments)
       stub_const('QA::Specs::Runner', runner)
+
+      allow(runner).to receive(:perform).and_yield(runner)
     end
 
-    it 'should set address' do
+    it 'sets an address of the subject' do
       subject.perform("hello")
 
-      expect(config).to have_received(:address=).with("hello")
+      expect(arguments).to have_received(:define)
+        .with(:gitlab_address, "hello")
     end
 
     context 'no paths' do