Wait for polling to finish before filling out form

Also rework spec to be much more real-world scenario. The previous spec
was merely testing that the email still appeared on the page without any
persistence (it would have been replaced by persisted value on page
refresh)

spec/features/clusters/installing_applications_shared_examples.rb

@@ -168,32 +168,54 @@ RSpec.shared_examples "installing applications for a cluster" do |managed_apps_l
         allow(ClusterWaitForIngressIpAddressWorker).to receive(:perform_async)
 
         create(:clusters_applications_helm, :installed, cluster: cluster) unless managed_apps_local_tiller
+      end
 
+      it 'shows status transition' do
         page.within('.js-cluster-application-row-cert_manager') do
           click_button 'Install'
+          wait_for_requests
+
+          expect(page).to have_field('Issuer Email', with: cluster.user.email)
+          expect(page).to have_css('.js-cluster-application-install-button', exact_text: 'Installing')
+
+          Clusters::Cluster.last.application_cert_manager.make_installing!
+
+          expect(page).to have_field('Issuer Email', with: cluster.user.email)
+          expect(page).to have_css('.js-cluster-application-install-button', exact_text: 'Installing')
+
+          Clusters::Cluster.last.application_cert_manager.make_installed!
+
+          expect(page).to have_field('Issuer Email', with: cluster.user.email)
+          expect(page).to have_css('.js-cluster-application-uninstall-button', exact_text: 'Uninstall')
         end
 
-        wait_for_requests
+        expect(page).to have_content('Cert-Manager was successfully installed on your Kubernetes cluster')
       end
 
-      it 'shows status transition' do
+      it 'installs with custom email' do
+        custom_email = 'new_email@example.org'
+
         page.within('.js-cluster-application-row-cert_manager') do
-          expect(page).to have_field('Issuer Email', with: cluster.user.email)
+          # Wait for the polling to finish
+          wait_for_requests
+
+          page.find('.js-email').set(custom_email)
+          click_button 'Install'
+          wait_for_requests
+
+          expect(page).to have_field('Issuer Email', with: custom_email)
           expect(page).to have_css('.js-cluster-application-install-button', exact_text: 'Installing')
 
-          page.find('.js-email').set("new_email@example.org")
           Clusters::Cluster.last.application_cert_manager.make_installing!
 
-          expect(page).to have_field('Issuer Email', with: 'new_email@example.org')
+          expect(page).to have_field('Issuer Email', with: custom_email)
           expect(page).to have_css('.js-cluster-application-install-button', exact_text: 'Installing')
 
           Clusters::Cluster.last.application_cert_manager.make_installed!
 
-          expect(page).to have_field('Issuer Email', with: 'new_email@example.org')
+          expect(page).to have_field('Issuer Email', with: custom_email)
           expect(page).to have_css('.js-cluster-application-uninstall-button', exact_text: 'Uninstall')
         end
-
-        expect(page).to have_content('Cert-Manager was successfully installed on your Kubernetes cluster')
       end
     end