Create shared_examples for *_new and *_discover buttons

spec/support/examples_group/shared_examples_for_new_or_discover_button.rb

@@ -0,0 +1,16 @@
+shared_examples_for 'a _new or _discover button' do
+  describe '#visible?' do
+    context 'when button present on a sublist view screen of a CI' do
+      let(:lastaction) { 'show' }
+      %w(main vms instances all_vms).each do |display|
+        context "and display == #{display}" do
+          let(:display) { display }
+          it { expect(subject.visible?).to be_truthy }
+        end
+        context 'and display is sublist-like' do
+          it { expect(subject.visible?).to be_falsey }
+        end
+      end
+    end
+  end
+end