Add e2e test for assigning a group iteration

Adds an e2e test for assigning a group iteration to an issue.

ee/app/assets/javascripts/sidebar/components/iteration_select.vue

@@ -161,7 +161,7 @@ export default {
 </script>
 
 <template>
-  <div>
+  <div data-qa-selector="iteration_container">
     <div v-gl-tooltip class="sidebar-collapsed-icon">
       <gl-icon :size="16" :aria-label="$options.iterationText" name="iteration" />
       <span class="collapse-truncated-title">{{ iterationTitle }}</span>
@@ -176,13 +176,14 @@ export default {
         data-track-label="right_sidebar"
         data-track-property="iteration"
         data-track-event="click_edit_button"
+        data-qa-selector="edit_iteration_link"
         @click.stop="toggleDropdown"
         >{{ __('Edit') }}</gl-button
       >
     </div>
     <div data-testid="select-iteration" class="hide-collapsed">
       <span v-if="showNoIterationContent" class="no-value">{{ $options.noIteration }}</span>
-      <gl-link v-else-if="!editing" :href="iterationUrl"
+      <gl-link v-else-if="!editing" data-qa-selector="iteration_link" :href="iterationUrl"
         ><strong>{{ iterationTitle }}</strong></gl-link
       >
     </div>

qa/qa/ee/page/project/issue/show.rb

@@ -12,26 +12,62 @@ module QA
               super
 
               base.class_eval do
+                view 'ee/app/assets/javascripts/sidebar/components/iteration_select.vue' do
+                  element :edit_iteration_link
+                  element :iteration_container
+                  element :iteration_link
+                end
+
                 view 'ee/app/assets/javascripts/sidebar/components/weight/weight.vue' do
-                  element :weight_label_value
                   element :edit_weight_link
                   element :remove_weight_link
                   element :weight_input_field
+                  element :weight_label_value
                   element :weight_no_value_content
                 end
               end
             end
 
+            def assign_iteration(iteration)
+              click_element(:edit_iteration_link)
+              within_element(:iteration_container) do
+                click_on("#{iteration.title}")
+              end
+
+              wait_until(reload: false) do
+                has_element?(:iteration_container, text: iteration.title, wait: 0)
+              end
+
+              refresh
+            end
+
             def click_remove_weight_link
               click_element(:remove_weight_link)
             end
 
+            def has_iteration?(iteration_title)
+              wait_until_iteration_container_loaded
+
+              within_element(:iteration_container) do
+                wait_until(reload: false) do
+                  has_element?(:iteration_link, text: iteration_title, wait: 0)
+                end
+              end
+            end
+
             def set_weight(weight)
               click_element(:edit_weight_link)
               fill_element(:weight_input_field, weight)
               send_keys_to_element(:weight_input_field, :enter)
             end
 
+            def wait_for_attachment_replication(image_url, max_wait: Runtime::Geo.max_file_replication_time)
+              QA::Runtime::Logger.debug(%Q[#{self.class.name} - wait_for_attachment_replication])
+              wait_until_geo_max_replication_time(max_wait: max_wait) do
+                asset_exists?(image_url)
+              end
+            end
+
             def weight_label_value
               find_element(:weight_label_value)
             end
@@ -40,16 +76,18 @@ module QA
               find_element(:weight_no_value_content)
             end
 
-            def wait_for_attachment_replication(image_url, max_wait: Runtime::Geo.max_file_replication_time)
-              QA::Runtime::Logger.debug(%Q[#{self.class.name} - wait_for_attachment_replication])
-              wait_until_geo_max_replication_time(max_wait: max_wait) do
-                asset_exists?(image_url)
-              end
-            end
+            private
 
             def wait_until_geo_max_replication_time(max_wait: Runtime::Geo.max_file_replication_time)
               wait_until(max_duration: max_wait) { yield }
             end
+
+            def wait_until_iteration_container_loaded
+              wait_until(reload: false, max_duration: 10, sleep_interval: 1) do
+                has_element?(:iteration_container)
+                has_element?(:iteration_link)
+              end
+            end
           end
         end
       end

qa/qa/specs/features/ee/browser_ui/2_plan/iterations/assign_group_iteration_spec.rb

+# frozen_string_literal: true
+
+module QA
+  RSpec.describe 'Plan' do
+    describe 'Assign Iterations' do
+      let(:project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.group = @iteration.group
+          project.name = "project-to-test-iterations-#{SecureRandom.hex(8)}"
+        end
+      end
+
+      let(:issue) do
+        Resource::Issue.fabricate_via_api! do |issue|
+          issue.project = project
+          issue.title = "issue-to-test-iterations-#{SecureRandom.hex(8)}"
+        end
+      end
+
+      before do
+        Flow::Login.sign_in
+      end
+
+      it 'assigns a group iteration to an existing issue', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/958' do
+        @iteration = EE::Resource::GroupIteration.fabricate_via_browser_ui!
+
+        issue.visit!
+
+        Page::Project::Issue::Show.perform do |issue|
+          issue.assign_iteration(@iteration)
+
+          expect(issue).to have_iteration(@iteration.title)
+        end
+      end
+    end
+  end
+end