Swimlanes - Fetch more epics button

- Improve performance for Swimlanes by paginating epics through user
action
- Fetch issues per epic
- Collapse unassigned issues lane and fetch unassigned issue when
expanding

Changelog: changed

app/assets/javascripts/boards/components/board_list_header.vue

@@ -73,7 +73,7 @@ export default {
   },
   computed: {
     ...mapState(['activeId']),
-    ...mapGetters(['isEpicBoard']),
+    ...mapGetters(['isEpicBoard', 'isSwimlanesOn']),
     isLoggedIn() {
       return Boolean(this.currentUserId);
     },
@@ -169,7 +169,14 @@ export default {
     },
 
     showNewIssueForm() {
-      eventHub.$emit(`${toggleFormEventPrefix.issue}${this.list.id}`);
+      if (this.isSwimlanesOn) {
+        eventHub.$emit('open-unassigned-lane');
+        this.$nextTick(() => {
+          eventHub.$emit(`${toggleFormEventPrefix.issue}${this.list.id}`);
+        });
+      } else {
+        eventHub.$emit(`${toggleFormEventPrefix.issue}${this.list.id}`);
+      }
     },
     showNewEpicForm() {
       eventHub.$emit(`${toggleFormEventPrefix.epic}${this.list.id}`);

ee/app/assets/javascripts/boards/components/epic_lane.vue

 <script>
-import { GlButton, GlIcon, GlLink, GlPopover, GlTooltipDirective } from '@gitlab/ui';
+import { GlButton, GlIcon, GlLink, GlLoadingIcon, GlPopover, GlTooltipDirective } from '@gitlab/ui';
 import { mapActions, mapGetters, mapState } from 'vuex';
 import { formatDate } from '~/lib/utils/datetime_utility';
 import { __, n__, sprintf } from '~/locale';
@@ -12,6 +12,7 @@ export default {
     GlButton,
     GlIcon,
     GlLink,
+    GlLoadingIcon,
     GlPopover,
     IssuesLaneList,
   },
@@ -48,7 +49,7 @@ export default {
     };
   },
   computed: {
-    ...mapState(['filterParams']),
+    ...mapState(['epicsFlags', 'filterParams']),
     ...mapGetters(['getIssuesByEpic']),
     isOpen() {
       return this.epic.state === statusType.open;
@@ -80,12 +81,30 @@ export default {
     epicDateString() {
       return formatDate(this.epic.createdAt);
     },
+    isLoading() {
+      return Boolean(this.epicsFlags[this.epic.id]?.isLoading);
+    },
     shouldDisplay() {
-      return this.issuesCount > 0;
+      return this.issuesCount > 0 || this.isLoading;
+    },
+  },
+  watch: {
+    filterParams: {
+      handler() {
+        if (!this.filterParams.epicId || this.filterParams.epicId === this.epic.id) {
+          this.fetchIssuesForEpic(this.epic.id);
+        }
+      },
+      deep: true,
     },
   },
+  mounted() {
+    if (this.issuesCount === 0) {
+      this.fetchIssuesForEpic(this.epic.id);
+    }
+  },
   methods: {
-    ...mapActions(['updateBoardEpicUserPreferences', 'setError']),
+    ...mapActions(['updateBoardEpicUserPreferences', 'setError', 'fetchIssuesForEpic']),
     toggleCollapsed() {
       this.isCollapsed = !this.isCollapsed;
 
@@ -101,7 +120,7 @@ export default {
 </script>
 
 <template>
-  <div v-if="shouldDisplay">
+  <div v-if="shouldDisplay" class="board-epic-lane-container">
     <div
       class="board-epic-lane gl-sticky gl-left-0 gl-display-inline-block"
       data-testid="board-epic-lane"
@@ -131,6 +150,7 @@ export default {
           <gl-link :href="epic.webUrl" class="gl-font-sm">{{ __('Go to epic') }}</gl-link>
         </gl-popover>
         <span
+          v-if="!isLoading"
           v-gl-tooltip.hover
           :title="issuesCountTooltipText"
           class="gl-display-flex gl-align-items-center gl-text-gray-500"
@@ -141,9 +161,14 @@ export default {
           <gl-icon class="gl-mr-2 gl-flex-shrink-0" name="issues" />
           <span aria-hidden="true">{{ issuesCount }}</span>
         </span>
+        <gl-loading-icon v-else class="gl-p-2" />
       </div>
     </div>
-    <div v-if="!isCollapsed" class="gl-display-flex gl-pb-5" data-testid="board-epic-lane-issues">
+    <div
+      v-if="!isCollapsed && issuesCount > 0"
+      class="gl-display-flex gl-pb-5 board-epic-lane-issues"
+      data-testid="board-epic-lane-issues"
+    >
       <issues-lane-list
         v-for="list in lists"
         :key="`${list.id}-issues`"

ee/app/assets/javascripts/boards/components/epics_swimlanes.vue

@@ -6,7 +6,8 @@ import { mapActions, mapGetters, mapState } from 'vuex';
 import BoardAddNewColumn from 'ee_else_ce/boards/components/board_add_new_column.vue';
 import BoardListHeader from 'ee_else_ce/boards/components/board_list_header.vue';
 import { isListDraggable } from '~/boards/boards_util';
-import { n__ } from '~/locale';
+import eventHub from '~/boards/eventhub';
+import { s__, n__, __ } from '~/locale';
 import defaultSortableConfig from '~/sortable/sortable_config';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { calculateSwimlanesBufferSize } from '../boards_util';
@@ -50,6 +51,7 @@ export default {
   data() {
     return {
       bufferSize: 0,
+      isUnassignedCollapsed: true,
     };
   },
   computed: {
@@ -60,6 +62,7 @@ export default {
       'addColumnForm',
       'filterParams',
       'epicsSwimlanesFetchInProgress',
+      'hasMoreEpics',
     ]),
     ...mapGetters(['getUnassignedIssues']),
     addColumnFormVisible() {
@@ -103,15 +106,26 @@ export default {
         epicLanesFetchInProgress,
         listItemsFetchInProgress,
       } = this.epicsSwimlanesFetchInProgress;
-      return epicLanesFetchInProgress && listItemsFetchInProgress;
+      return epicLanesFetchInProgress || listItemsFetchInProgress;
+    },
+    chevronTooltip() {
+      return this.isUnassignedCollapsed ? __('Expand') : __('Collapse');
+    },
+    chevronIcon() {
+      return this.isUnassignedCollapsed ? 'chevron-right' : 'chevron-down';
+    },
+    epicButtonLabel() {
+      return this.epicsSwimlanesFetchInProgress.epicLanesFetchMoreInProgress
+        ? s__('Board|Loading epics')
+        : s__('Board|Load more epics');
     },
   },
   watch: {
     filterParams: {
       handler() {
         Promise.all(
-          this.lists.map((list) => {
-            return this.fetchItemsForList({ listId: list.id, forSwimlanes: true });
+          this.epics.map((epic) => {
+            return this.fetchIssuesForEpic(epic.id);
           }),
         )
           .then(() => this.doneLoadingSwimlanesItems())
@@ -124,8 +138,20 @@ export default {
   mounted() {
     this.bufferSize = calculateSwimlanesBufferSize(this.$el.offsetTop);
   },
+  created() {
+    eventHub.$on('open-unassigned-lane', this.openUnassignedLane);
+  },
+  beforeDestroy() {
+    eventHub.$off('open-unassigned-lane', this.openUnassignedLane);
+  },
   methods: {
-    ...mapActions(['moveList', 'fetchItemsForList', 'doneLoadingSwimlanesItems']),
+    ...mapActions([
+      'moveList',
+      'fetchEpicsSwimlanes',
+      'fetchIssuesForEpic',
+      'fetchItemsForList',
+      'doneLoadingSwimlanesItems',
+    ]),
     handleDragOnEnd(params) {
       const { newIndex, oldIndex, item, to } = params;
       const { listId } = item.dataset;
@@ -138,6 +164,9 @@ export default {
         adjustmentValue: newIndex < oldIndex ? 1 : -1,
       });
     },
+    fetchMoreEpics() {
+      this.fetchEpicsSwimlanes({ fetchNext: true });
+    },
     fetchMoreUnassignedIssues() {
       this.lists.forEach((list) => {
         if (this.pageInfoByListId[list.id]?.hasNextPage) {
@@ -166,6 +195,12 @@ export default {
         },
       };
     },
+    toggleUnassignedLane() {
+      this.isUnassignedCollapsed = !this.isUnassignedCollapsed;
+    },
+    openUnassignedLane() {
+      this.isUnassignedCollapsed = false;
+    },
   },
 };
 </script>
@@ -228,14 +263,42 @@ export default {
             :can-admin-list="canAdminList"
           />
         </template>
+        <div v-if="hasMoreEpics" class="swimlanes-button gl-pb-3 gl-pl-3 gl-sticky gl-left-0">
+          <gl-button
+            category="tertiary"
+            variant="confirm"
+            class="gl-w-full"
+            :loading="epicsSwimlanesFetchInProgress.epicLanesFetchMoreInProgress"
+            :disabled="epicsSwimlanesFetchInProgress.epicLanesFetchMoreInProgress"
+            data-testid="load-more-epics"
+            data-track-action="click_button"
+            data-track-label="toggle_swimlanes"
+            data-track-property="click_load_more_epics"
+            @click="fetchMoreEpics()"
+          >
+            {{ epicButtonLabel }}
+          </gl-button>
+        </div>
         <div class="board-lane-unassigned-issues-title gl-sticky gl-display-inline-block gl-left-0">
           <div class="gl-left-0 gl-pb-5 gl-px-3 gl-display-flex gl-align-items-center">
+            <gl-button
+              v-gl-tooltip.hover.right
+              :aria-label="chevronTooltip"
+              :title="chevronTooltip"
+              :icon="chevronIcon"
+              class="gl-mr-2 gl-cursor-pointer"
+              category="tertiary"
+              size="small"
+              data-testid="unassigned-lane-toggle"
+              @click="toggleUnassignedLane"
+            />
             <span
               class="gl-mr-3 gl-font-weight-bold gl-white-space-nowrap gl-text-overflow-ellipsis gl-overflow-hidden"
             >
               {{ __('Issues with no epic assigned') }}
             </span>
             <span
+              v-if="unassignedIssuesCount > 0"
               v-gl-tooltip.hover
               :title="unassignedIssuesCountTooltipText"
               class="gl-display-flex gl-align-items-center gl-text-gray-500"
@@ -248,7 +311,7 @@ export default {
             </span>
           </div>
         </div>
-        <div data-testid="board-lane-unassigned-issues">
+        <div v-if="!isUnassignedCollapsed" data-testid="board-lane-unassigned-issues">
           <div class="gl-display-flex">
             <issues-lane-list
               v-for="list in lists"
@@ -263,9 +326,8 @@ export default {
         </div>
       </div>
       <div
-        v-if="hasMoreUnassignedIssues"
-        class="gl-p-3 gl-sticky gl-left-0"
-        style="max-width: 100vw"
+        v-if="hasMoreUnassignedIssues && !isUnassignedCollapsed"
+        class="swimlanes-button gl-p-3 gl-pr-0 gl-sticky gl-left-0"
       >
         <gl-button
           category="tertiary"

ee/app/assets/javascripts/boards/components/issues_lane_list.vue

@@ -67,8 +67,10 @@ export default {
 
       return this.canAdminList ? options : {};
     },
-    isLoadingMore() {
-      return this.listsFlags[this.list.id]?.isLoadingMore;
+    isLoading() {
+      return (
+        this.listsFlags[this.list.id]?.isLoading || this.listsFlags[this.list.id]?.isLoadingMore
+      );
     },
     highlighted() {
       return this.highlightedLists.includes(this.list.id);
@@ -190,7 +192,7 @@ export default {
           :item="issue"
           :disabled="disabled || !canAdminEpic"
         />
-        <gl-loading-icon v-if="isLoadingMore && isUnassignedIssuesLane" size="sm" class="gl-py-3" />
+        <gl-loading-icon v-if="isLoading && isUnassignedIssuesLane" size="sm" class="gl-py-3" />
       </component>
     </div>
   </div>

ee/app/assets/javascripts/boards/graphql/epics_swimlanes.query.graphql

@@ -10,7 +10,7 @@ query BoardEE(
 ) {
   group(fullPath: $fullPath) @include(if: $isGroup) {
     board(id: $boardId) {
-      epics(first: 20, issueFilters: $issueFilters, after: $after) {
+      epics(first: 10, issueFilters: $issueFilters, after: $after) {
         edges {
           node {
             ...BoardEpicNode
@@ -28,7 +28,7 @@ query BoardEE(
   }
   project(fullPath: $fullPath) @include(if: $isProject) {
     board(id: $boardId) {
-      epics(first: 20, issueFilters: $issueFilters, after: $after) {
+      epics(first: 10, issueFilters: $issueFilters, after: $after) {
         edges {
           node {
             ...BoardEpicNode

ee/app/assets/javascripts/boards/graphql/issue.fragment.graphql

@@ -10,7 +10,6 @@ fragment IssueNode on Issue {
   totalTimeSpent
   humanTimeEstimate
   humanTotalTimeSpent
-  emailsDisabled
   weight
   confidential
   webUrl

ee/app/assets/javascripts/boards/stores/actions.js

@@ -134,8 +134,12 @@ export default {
     }
   },
 
-  fetchEpicsSwimlanes({ state, commit, dispatch }, { endCursor = null } = {}) {
-    const { fullPath, boardId, boardType, filterParams } = state;
+  fetchEpicsSwimlanes({ state, commit }, { fetchNext = false } = {}) {
+    const { fullPath, boardId, boardType, filterParams, epicsEndCursor } = state;
+
+    if (fetchNext) {
+      commit(types.REQUEST_MORE_EPICS);
+    }
 
     const variables = {
       fullPath,
@@ -143,7 +147,7 @@ export default {
       issueFilters: filterParams,
       isGroup: boardType === BoardType.group,
       isProject: boardType === BoardType.project,
-      after: endCursor,
+      after: fetchNext ? epicsEndCursor : undefined,
     };
 
     return gqlClient
@@ -161,18 +165,30 @@ export default {
           commit(types.RECEIVE_EPICS_SUCCESS, {
             epics: epicsFormatted,
             canAdminEpic: epics.edges[0]?.node?.userPermissions?.adminEpic,
-          });
-        }
-
-        if (epics.pageInfo?.hasNextPage) {
-          dispatch('fetchEpicsSwimlanes', {
-            endCursor: epics.pageInfo.endCursor,
+            hasMoreEpics: epics.pageInfo?.hasNextPage,
+            epicsEndCursor: epics.pageInfo?.endCursor,
           });
         }
       })
       .catch(() => commit(types.RECEIVE_SWIMLANES_FAILURE));
   },
 
+  fetchIssuesForEpic: ({ state, commit }, epicId) => {
+    commit(types.REQUEST_ISSUES_FOR_EPIC, epicId);
+
+    const { filterParams } = state;
+
+    const variables = {
+      filters: { ...filterParams, epicId },
+    };
+
+    return fetchAndFormatListIssues(state, variables)
+      .then(({ listItems }) => {
+        commit(types.RECEIVE_ISSUES_FOR_EPIC_SUCCESS, { ...listItems, epicId });
+      })
+      .catch(() => commit(types.RECEIVE_ISSUES_FOR_EPIC_FAILURE, epicId));
+  },
+
   updateBoardEpicUserPreferences({ commit, state }, { epicId, collapsed }) {
     const { boardId } = state;
 
@@ -244,7 +260,7 @@ export default {
 
   fetchItemsForList: (
     { state, commit, getters },
-    { listId, fetchNext = false, noEpicIssues = false, forSwimlanes = false },
+    { listId, fetchNext = false, noEpicIssues = false },
   ) => {
     if (!fetchNext && !state.isShowingEpicsSwimlanes) {
       commit(types.RESET_ITEMS_FOR_LIST, listId);
@@ -255,9 +271,6 @@ export default {
     if (noEpicIssues && epicId !== undefined) {
       return null;
     }
-    if (forSwimlanes && epicId === undefined && filterParams.epicWildcardId === undefined) {
-      filterParams.epicWildcardId = EpicFilterType.any.toUpperCase();
-    }
 
     const variables = {
       id: listId,
@@ -265,7 +278,7 @@ export default {
         ? { ...filterParams, epicWildcardId: EpicFilterType.none.toUpperCase() }
         : { ...filterParams, epicId },
       after: fetchNext ? state.pageInfoByListId[listId].endCursor : undefined,
-      first: forSwimlanes ? undefined : 10,
+      first: 10,
     };
 
     if (getters.isEpicBoard) {

ee/app/assets/javascripts/boards/stores/mutation_types.js

@@ -8,6 +8,7 @@ export const RECEIVE_ISSUES_FOR_EPIC_SUCCESS = 'RECEIVE_ISSUES_FOR_EPIC_SUCCESS'
 export const RECEIVE_ISSUES_FOR_EPIC_FAILURE = 'RECEIVE_ISSUES_FOR_EPIC_FAILURE';
 export const UPDATE_LIST_SUCCESS = 'UPDATE_LIST_SUCCESS';
 export const RECEIVE_SWIMLANES_FAILURE = 'RECEIVE_SWIMLANES_FAILURE';
+export const REQUEST_MORE_EPICS = 'REQUEST_MORE_EPICS';
 export const RECEIVE_EPICS_SUCCESS = 'RECEIVE_EPICS_SUCCESS';
 export const RESET_EPICS = 'RESET_EPICS';
 export const SET_SHOW_LABELS = 'SET_SHOW_LABELS';

ee/app/assets/javascripts/boards/stores/mutations.js

@@ -49,6 +49,28 @@ export default {
     Vue.set(state.boardItemsByListId, listId, state.backupItemsList);
   },
 
+  [mutationTypes.REQUEST_ISSUES_FOR_EPIC]: (state, epicId) => {
+    Vue.set(state.epicsFlags, epicId, { isLoading: true });
+  },
+
+  [mutationTypes.RECEIVE_ISSUES_FOR_EPIC_SUCCESS]: (state, { listData, boardItems, epicId }) => {
+    Object.entries(listData).forEach(([listId, list]) => {
+      Vue.set(
+        state.boardItemsByListId,
+        listId,
+        union(state.boardItemsByListId[listId] || [], list),
+      );
+    });
+
+    Vue.set(state, 'boardItems', { ...state.boardItems, ...boardItems });
+    Vue.set(state.epicsFlags, epicId, { isLoading: false });
+  },
+
+  [mutationTypes.RECEIVE_ISSUES_FOR_EPIC_FAILURE]: (state, epicId) => {
+    state.error = s__('Boards|An error occurred while fetching issues. Please reload the page.');
+    Vue.set(state.epicsFlags, epicId, { isLoading: false });
+  },
+
   [mutationTypes.TOGGLE_EPICS_SWIMLANES]: (state) => {
     state.isShowingEpicsSwimlanes = !state.isShowingEpicsSwimlanes;
     Vue.set(state, 'epicsSwimlanesFetchInProgress', {
@@ -86,11 +108,27 @@ export default {
     });
   },
 
-  [mutationTypes.RECEIVE_EPICS_SUCCESS]: (state, { epics, canAdminEpic }) => {
+  [mutationTypes.REQUEST_MORE_EPICS]: (state) => {
+    Vue.set(state, 'epicsSwimlanesFetchInProgress', {
+      ...state.epicsSwimlanesFetchInProgress,
+      epicLanesFetchMoreInProgress: true,
+    });
+  },
+  [mutationTypes.RECEIVE_EPICS_SUCCESS]: (
+    state,
+    { epics, canAdminEpic, hasMoreEpics, epicsEndCursor },
+  ) => {
     Vue.set(state, 'epics', unionBy(state.epics || [], epics, 'id'));
+    Vue.set(state, 'hasMoreEpics', hasMoreEpics);
+    Vue.set(state, 'epicsEndCursor', epicsEndCursor);
     if (canAdminEpic !== undefined) {
       state.canAdminEpic = canAdminEpic;
     }
+    Vue.set(state, 'epicsSwimlanesFetchInProgress', {
+      ...state.epicsSwimlanesFetchInProgress,
+      epicLanesFetchInProgress: false,
+      epicLanesFetchMoreInProgress: false,
+    });
   },
 
   [mutationTypes.RESET_EPICS]: (state) => {

ee/app/assets/javascripts/boards/stores/state.js

@@ -8,8 +8,12 @@ export default () => ({
   epicsSwimlanesFetchInProgress: {
     epicLanesFetchInProgress: false,
     listItemsFetchInProgress: false,
+    epicLanesFetchMoreInProgress: false,
   },
+  hasMoreEpics: false,
+  epicsEndCursor: null,
   epics: [],
+  epicsFlags: {},
   milestones: [],
   milestonesLoading: false,
   iterations: [],

ee/app/assets/stylesheets/page_bundles/boards.scss

@@ -109,9 +109,14 @@
   }
 }
 
+.board-epic-lane-container:last-child .board-epic-lane-issues {
+  padding-bottom: $gl-spacing-scale-3;
+}
+
 $epic-icons-spacing: 40px;
 
-.board-epic-lane {
+.board-epic-lane,
+.swimlanes-button {
   max-width: calc(100vw - #{$contextual-sidebar-width} - #{$epic-icons-spacing});
 
   .page-with-icon-sidebar & {

ee/spec/features/boards/swimlanes/epics_swimlanes_drag_issue_spec.rb

@@ -5,6 +5,7 @@ require 'spec_helper'
 RSpec.describe 'epics swimlanes', :js do
   include DragTo
   include MobileHelpers
+  include BoardHelpers
 
   let_it_be(:user) { create(:user) }
   let_it_be(:group) { create(:group, :public) }
@@ -33,7 +34,8 @@ RSpec.describe 'epics swimlanes', :js do
 
     sign_in(user)
     visit_board_page
-    select_epics
+    load_epic_swimlanes
+    load_unassigned_issues
   end
 
   context 'drag and drop issue' do

ee/spec/features/boards/swimlanes/epics_swimlanes_filtering_spec.rb

@@ -3,6 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe 'epics swimlanes filtering', :js do
+  include BoardHelpers
+
   let_it_be(:user) { create(:user) }
   let_it_be(:user2)   { create(:user) }
   let_it_be(:group) { create(:group, :public) }
@@ -44,10 +46,9 @@ RSpec.describe 'epics swimlanes filtering', :js do
       sign_in(user)
       visit_board_page
 
-      page.within('.board-swimlanes-toggle-wrapper') do
-        page.find('.dropdown-toggle').click
-        page.find('.dropdown-item', text: 'Epic').click
-      end
+      load_epic_swimlanes
+
+      load_unassigned_issues
 
       wait_for_all_issues
     end

ee/spec/features/boards/swimlanes/epics_swimlanes_sidebar_labels_spec.rb

@@ -21,6 +21,7 @@ RSpec.describe 'Issue boards sidebar labels using epic swimlanes', :js do
       before do
         load_board group_board_path(group, group_board)
         load_epic_swimlanes
+        load_unassigned_issues
       end
 
       context 'selecting an issue from a direct descendant project' do

ee/spec/features/boards/swimlanes/epics_swimlanes_sidebar_spec.rb

@@ -31,6 +31,8 @@ RSpec.describe 'epics swimlanes sidebar', :js do
       wait_for_requests
 
       load_epic_swimlanes
+
+      load_unassigned_issues
     end
 
     it_behaves_like 'issue boards sidebar'
@@ -44,6 +46,8 @@ RSpec.describe 'epics swimlanes sidebar', :js do
       wait_for_requests
 
       load_epic_swimlanes
+
+      load_unassigned_issues
     end
 
     it_behaves_like 'issue boards sidebar'
@@ -57,4 +61,14 @@ RSpec.describe 'epics swimlanes sidebar', :js do
   def first_card_with_epic
     find("[data-testid='board-epic-lane-issues']").first("[data-testid='board_card']")
   end
+
+  def refresh_and_click_first_card
+    page.refresh
+
+    wait_for_requests
+
+    load_unassigned_issues
+
+    first_card.click
+  end
 end

ee/spec/features/boards/swimlanes/epics_swimlanes_spec.rb

@@ -3,6 +3,8 @@
 require 'spec_helper'
 
 RSpec.describe 'epics swimlanes', :js do
+  include BoardHelpers
+
   let_it_be(:user) { create(:user) }
   let_it_be(:group) { create(:group, :public) }
   let_it_be(:project) { create(:project, :public, group: group) }
@@ -38,8 +40,12 @@ RSpec.describe 'epics swimlanes', :js do
       expect(epic_lanes.length).to eq(2)
     end
 
-    it 'displays issue not assigned to epic in unassigned issues lane' do
+    it 'displays issue not assigned to epic title and unassigned issues lane only on expand' do
       page.within('.board-lane-unassigned-issues-title') do
+        expect(page).not_to have_selector('span[data-testid="issues-lane-issue-count"]')
+
+        load_unassigned_issues
+
         expect(page.find('span[data-testid="issues-lane-issue-count"]')).to have_content('1')
       end
     end
@@ -61,7 +67,7 @@ RSpec.describe 'epics swimlanes', :js do
     stub_licensed_features(epics: true, swimlanes: true)
     sign_in(user)
     visit_board_page
-    select_epics
+    load_epic_swimlanes
   end
 
   context 'switch to swimlanes view' do
@@ -72,8 +78,12 @@ RSpec.describe 'epics swimlanes', :js do
       expect(epic_lanes.length).to eq(2)
     end
 
-    it 'displays issue not assigned to epic in unassigned issues lane' do
+    it 'displays issue not assigned to epic title and unassigned issues lane only on expand' do
       page.within('.board-lane-unassigned-issues-title') do
+        expect(page).not_to have_selector('span[data-testid="issues-lane-issue-count"]')
+
+        load_unassigned_issues
+
         expect(page.find('span[data-testid="issues-lane-issue-count"]')).to have_content('1')
       end
     end
@@ -102,6 +112,12 @@ RSpec.describe 'epics swimlanes', :js do
   end
 
   context 'add issue to swimlanes list' do
+    before do
+      wait_for_all_requests
+
+      load_unassigned_issues
+    end
+
     it 'displays new issue button' do
       expect(first('.board')).to have_selector('.issue-count-badge-add-button', count: 1)
     end
@@ -165,13 +181,6 @@ RSpec.describe 'epics swimlanes', :js do
     wait_for_requests
   end
 
-  def select_epics
-    page.within('.board-swimlanes-toggle-wrapper') do
-      page.find('.dropdown-toggle').click
-      page.find('.dropdown-item', text: 'Epic').click
-    end
-  end
-
   def visit_epics_swimlanes_page
     visit "#{project_boards_path(project)}?group_by=epic"
     wait_for_requests

ee/spec/features/boards/user_visits_board_spec.rb

@@ -3,6 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe 'User visits issue boards', :js do
+  include BoardHelpers
   using RSpec::Parameterized::TableSyntax
 
   let_it_be(:group) { create_default(:group, :public) }
@@ -34,6 +35,10 @@ RSpec.describe 'User visits issue boards', :js do
       visit board_path
 
       wait_for_requests
+
+      if board_path.include?('group_by')
+        load_unassigned_issues
+      end
     end
 
     it 'displays all issues satisfiying filter params and correctly sets url params' do

ee/spec/frontend/boards/components/epic_lane_spec.js

-import { GlIcon } from '@gitlab/ui';
-import { createLocalVue, shallowMount } from '@vue/test-utils';
+import { GlIcon, GlLoadingIcon } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
+import Vue from 'vue';
 import Vuex from 'vuex';
 import EpicLane from 'ee/boards/components/epic_lane.vue';
 import IssuesLaneList from 'ee/boards/components/issues_lane_list.vue';
 import getters from 'ee/boards/stores/getters';
+import { extendedWrapper } from 'helpers/vue_test_utils_helper';
 import { mockEpic, mockLists, mockIssuesByListId, issues } from '../mock_data';
 
-const localVue = createLocalVue();
-localVue.use(Vuex);
+Vue.use(Vuex);
 
 describe('EpicLane', () => {
   let wrapper;
 
-  const findByTestId = (testId) => wrapper.find(`[data-testid="${testId}"]`);
-
   const updateBoardEpicUserPreferencesSpy = jest.fn();
 
-  const createStore = ({ boardItemsByListId = mockIssuesByListId }) => {
+  const createStore = ({ boardItemsByListId = mockIssuesByListId, isLoading = false }) => {
     return new Vuex.Store({
       actions: {
         updateBoardEpicUserPreferences: updateBoardEpicUserPreferencesSpy,
+        fetchIssuesForEpic: jest.fn(),
       },
       state: {
         boardItemsByListId,
         boardItems: issues,
+        epicsFlags: {
+          [mockEpic.id]: {
+            isLoading,
+          },
+        },
       },
       getters,
     });
   };
 
-  const createComponent = ({ props = {}, boardItemsByListId = mockIssuesByListId } = {}) => {
-    const store = createStore({ boardItemsByListId });
+  const createComponent = ({
+    props = {},
+    boardItemsByListId = mockIssuesByListId,
+    isLoading = false,
+  } = {}) => {
+    const store = createStore({ boardItemsByListId, isLoading });
 
     const defaultProps = {
       epic: mockEpic,
@@ -38,14 +47,15 @@ describe('EpicLane', () => {
       disabled: false,
     };
 
-    wrapper = shallowMount(EpicLane, {
-      localVue,
-      propsData: {
-        ...defaultProps,
-        ...props,
-      },
-      store,
-    });
+    wrapper = extendedWrapper(
+      shallowMount(EpicLane, {
+        propsData: {
+          ...defaultProps,
+          ...props,
+        },
+        store,
+      }),
+    );
   };
 
   afterEach(() => {
@@ -58,7 +68,7 @@ describe('EpicLane', () => {
     });
 
     it('displays count of issues in epic which belong to board', () => {
-      expect(findByTestId('epic-lane-issue-count').text()).toContain(2);
+      expect(wrapper.findByTestId('epic-lane-issue-count').text()).toContain(2);
     });
 
     it('displays 1 icon', () => {
@@ -77,7 +87,7 @@ describe('EpicLane', () => {
       expect(wrapper.findAll(IssuesLaneList)).toHaveLength(wrapper.props('lists').length);
       expect(wrapper.vm.isCollapsed).toBe(false);
 
-      findByTestId('epic-lane-chevron').vm.$emit('click');
+      wrapper.findByTestId('epic-lane-chevron').vm.$emit('click');
 
       return wrapper.vm.$nextTick().then(() => {
         expect(wrapper.findAll(IssuesLaneList)).toHaveLength(0);
@@ -85,12 +95,22 @@ describe('EpicLane', () => {
       });
     });
 
+    it('does not display loading icon when issues are not loading', () => {
+      expect(wrapper.find(GlLoadingIcon).exists()).toBe(false);
+    });
+
+    it('displays loading icon and hides issues count when issues are loading', () => {
+      createComponent({ isLoading: true });
+      expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
+      expect(wrapper.findByTestId('epic-lane-issue-count').exists()).toBe(false);
+    });
+
     it('invokes `updateBoardEpicUserPreferences` method on collapse', () => {
       const collapsedValue = false;
 
       expect(wrapper.vm.isCollapsed).toBe(collapsedValue);
 
-      findByTestId('epic-lane-chevron').vm.$emit('click');
+      wrapper.findByTestId('epic-lane-chevron').vm.$emit('click');
 
       return wrapper.vm.$nextTick().then(() => {
         expect(updateBoardEpicUserPreferencesSpy).toHaveBeenCalled();
@@ -108,7 +128,7 @@ describe('EpicLane', () => {
 
     it('does not render when issuesCount is 0', () => {
       createComponent({ boardItemsByListId: {} });
-      expect(findByTestId('board-epic-lane').exists()).toBe(false);
+      expect(wrapper.findByTestId('board-epic-lane').exists()).toBe(false);
     });
   });
 });

ee/spec/frontend/boards/components/epics_swimlanes_spec.js

@@ -12,6 +12,7 @@ import SwimlanesLoadingSkeleton from 'ee/boards/components/swimlanes_loading_ske
 import { EPIC_LANE_BASE_HEIGHT } from 'ee/boards/constants';
 import getters from 'ee/boards/stores/getters';
 import BoardListHeader from 'ee_else_ce/boards/components/board_list_header.vue';
+import { extendedWrapper } from 'helpers/vue_test_utils_helper';
 import { mockLists, mockEpics, mockIssuesByListId, issues } from '../mock_data';
 
 Vue.use(Vuex);
@@ -20,11 +21,18 @@ jest.mock('ee/boards/boards_util');
 describe('EpicsSwimlanes', () => {
   let wrapper;
 
+  const findDraggable = () => wrapper.findComponent(Draggable);
+  const findLoadMoreEpicsButton = () => wrapper.findByTestId('load-more-epics');
+
   const fetchItemsForListSpy = jest.fn();
+  const fetchIssuesForEpicSpy = jest.fn();
+  const fetchEpicsSwimlanesSpy = jest.fn();
 
   const createStore = ({
     epicLanesFetchInProgress = false,
     listItemsFetchInProgress = false,
+    epicLanesFetchMoreInProgress = false,
+    hasMoreEpics = false,
   } = {}) => {
     return new Vuex.Store({
       state: {
@@ -46,11 +54,15 @@ describe('EpicsSwimlanes', () => {
         epicsSwimlanesFetchInProgress: {
           epicLanesFetchInProgress,
           listItemsFetchInProgress,
+          epicLanesFetchMoreInProgress,
         },
+        hasMoreEpics,
       },
       getters,
       actions: {
         fetchItemsForList: fetchItemsForListSpy,
+        fetchIssuesForEpic: fetchIssuesForEpicSpy,
+        fetchEpicsSwimlanes: fetchEpicsSwimlanesSpy,
       },
     });
   };
@@ -60,29 +72,32 @@ describe('EpicsSwimlanes', () => {
     swimlanesBufferedRendering = false,
     epicLanesFetchInProgress = false,
     listItemsFetchInProgress = false,
+    hasMoreEpics = false,
   } = {}) => {
-    const store = createStore({ epicLanesFetchInProgress, listItemsFetchInProgress });
+    const store = createStore({ epicLanesFetchInProgress, listItemsFetchInProgress, hasMoreEpics });
     const defaultProps = {
       lists: mockLists,
       disabled: false,
     };
 
-    wrapper = shallowMount(EpicsSwimlanes, {
-      propsData: { ...defaultProps, canAdminList },
-      store,
-      provide: {
-        glFeatures: { swimlanesBufferedRendering },
-      },
-    });
+    wrapper = extendedWrapper(
+      shallowMount(EpicsSwimlanes, {
+        propsData: { ...defaultProps, canAdminList },
+        store,
+        provide: {
+          glFeatures: { swimlanesBufferedRendering },
+        },
+      }),
+    );
   };
 
   afterEach(() => {
     wrapper.destroy();
   });
 
-  it('calls fetchItemsForList on mounted', () => {
+  it('calls fetchIssuesForEpic on mounted', () => {
     createComponent();
-    expect(fetchItemsForListSpy).toHaveBeenCalled();
+    expect(fetchIssuesForEpicSpy).toHaveBeenCalled();
   });
 
   describe('computed', () => {
@@ -93,7 +108,7 @@ describe('EpicsSwimlanes', () => {
         });
 
         it('should return Draggable reference when canAdminList prop is true', () => {
-          expect(wrapper.find(Draggable).exists()).toBe(true);
+          expect(findDraggable().exists()).toBe(true);
         });
       });
 
@@ -103,7 +118,7 @@ describe('EpicsSwimlanes', () => {
         });
 
         it('should not return Draggable reference when canAdminList prop is false', () => {
-          expect(wrapper.find(Draggable).exists()).toBe(false);
+          expect(findDraggable().exists()).toBe(false);
         });
       });
     });
@@ -115,20 +130,31 @@ describe('EpicsSwimlanes', () => {
     });
 
     it('displays BoardListHeader components for lists', () => {
-      expect(wrapper.findAll(BoardListHeader)).toHaveLength(4);
+      expect(wrapper.findAllComponents(BoardListHeader)).toHaveLength(4);
     });
 
     it('displays EpicLane components for epic', () => {
-      expect(wrapper.findAll(EpicLane)).toHaveLength(5);
+      expect(wrapper.findAllComponents(EpicLane)).toHaveLength(5);
     });
 
-    it('displays IssueLaneList component', () => {
-      expect(wrapper.find(IssueLaneList).exists()).toBe(true);
+    it('does not display IssueLaneList component by default', () => {
+      expect(wrapper.findComponent(IssueLaneList).exists()).toBe(false);
+    });
+
+    it('does not display load more epics button if there are no more epics', () => {
+      expect(findLoadMoreEpicsButton().exists()).toBe(false);
+    });
+
+    it('displays IssueLaneList component when toggling unassigned issues lane', async () => {
+      wrapper.vm.toggleUnassignedLane();
+
+      await wrapper.vm.$nextTick();
+      expect(wrapper.findComponent(IssueLaneList).exists()).toBe(true);
     });
 
     it('displays issues icon and count for unassigned issue', () => {
-      expect(wrapper.find(GlIcon).props('name')).toEqual('issues');
-      expect(wrapper.find('[data-testid="issues-lane-issue-count"]').text()).toEqual('2');
+      expect(wrapper.findComponent(GlIcon).props('name')).toEqual('issues');
+      expect(wrapper.findByTestId('issues-lane-issue-count').text()).toEqual('2');
     });
 
     it('makes non preset lists draggable', () => {
@@ -144,19 +170,37 @@ describe('EpicsSwimlanes', () => {
     });
   });
 
+  describe('load more epics', () => {
+    beforeEach(() => {
+      createComponent({ hasMoreEpics: true });
+    });
+
+    it('displays load more epics button if there are more epics', () => {
+      expect(findLoadMoreEpicsButton().exists()).toBe(true);
+    });
+
+    it('calls fetchEpicsSwimlanes action when loading more epics', async () => {
+      findLoadMoreEpicsButton().vm.$emit('click');
+
+      await wrapper.vm.$nextTick();
+
+      expect(fetchEpicsSwimlanesSpy).toHaveBeenCalled();
+    });
+  });
+
   describe('Loading skeleton', () => {
     it.each`
       epicLanesFetchInProgress | listItemsFetchInProgress | expected
       ${true}                  | ${true}                  | ${true}
-      ${false}                 | ${true}                  | ${false}
-      ${true}                  | ${false}                 | ${false}
+      ${false}                 | ${true}                  | ${true}
+      ${true}                  | ${false}                 | ${true}
       ${false}                 | ${false}                 | ${false}
     `(
       'loading is $expected when epicLanesFetchInProgress is $epicLanesFetchInProgress and listItemsFetchInProgress is $listItemsFetchInProgress',
       ({ epicLanesFetchInProgress, listItemsFetchInProgress, expected }) => {
         createComponent({ epicLanesFetchInProgress, listItemsFetchInProgress });
 
-        expect(wrapper.find(SwimlanesLoadingSkeleton).exists()).toBe(expected);
+        expect(wrapper.findComponent(SwimlanesLoadingSkeleton).exists()).toBe(expected);
       },
     );
   });

ee/spec/frontend/boards/stores/actions_spec.js

@@ -217,6 +217,22 @@ describe('fetchEpicsSwimlanes', () => {
     },
   };
 
+  const queryResponseWithNextPage = {
+    data: {
+      group: {
+        board: {
+          epics: {
+            edges: [{ node: mockEpic }],
+            pageInfo: {
+              hasNextPage: true,
+              endCursor: 'ENDCURSOR',
+            },
+          },
+        },
+      },
+    },
+  };
+
   it('should commit mutation RECEIVE_EPICS_SUCCESS on success', (done) => {
     jest.spyOn(gqlClient, 'query').mockResolvedValue(queryResponse);
 
@@ -235,35 +251,26 @@ describe('fetchEpicsSwimlanes', () => {
     );
   });
 
-  it('should commit mutation RECEIVE_SWIMLANES_FAILURE on failure', (done) => {
-    jest.spyOn(gqlClient, 'query').mockResolvedValue(Promise.reject());
+  it('should commit mutation REQUEST_MORE_EPICS when fetchNext is true', (done) => {
+    jest.spyOn(gqlClient, 'query').mockResolvedValue(queryResponse);
 
     testAction(
       actions.fetchEpicsSwimlanes,
-      {},
+      { fetchNext: true },
       state,
-      [{ type: types.RECEIVE_SWIMLANES_FAILURE }],
+      [
+        { type: types.REQUEST_MORE_EPICS },
+        {
+          type: types.RECEIVE_EPICS_SUCCESS,
+          payload: { epics: [mockEpic] },
+        },
+      ],
       [],
       done,
     );
   });
 
-  it('should dispatch fetchEpicsSwimlanes when page info hasNextPage', (done) => {
-    const queryResponseWithNextPage = {
-      data: {
-        group: {
-          board: {
-            epics: {
-              edges: [{ node: mockEpic }],
-              pageInfo: {
-                hasNextPage: true,
-                endCursor: 'ENDCURSOR',
-              },
-            },
-          },
-        },
-      },
-    };
+  it('should commit mutation RECEIVE_EPICS_SUCCESS on success with hasMoreEpics when hasNextPage', (done) => {
     jest.spyOn(gqlClient, 'query').mockResolvedValue(queryResponseWithNextPage);
 
     testAction(
@@ -273,15 +280,23 @@ describe('fetchEpicsSwimlanes', () => {
       [
         {
           type: types.RECEIVE_EPICS_SUCCESS,
-          payload: { epics: [mockEpic] },
-        },
-      ],
-      [
-        {
-          type: 'fetchEpicsSwimlanes',
-          payload: { endCursor: 'ENDCURSOR' },
+          payload: { epics: [mockEpic], hasMoreEpics: true, epicsEndCursor: 'ENDCURSOR' },
         },
       ],
+      [],
+      done,
+    );
+  });
+
+  it('should commit mutation RECEIVE_SWIMLANES_FAILURE on failure', (done) => {
+    jest.spyOn(gqlClient, 'query').mockResolvedValue(Promise.reject());
+
+    testAction(
+      actions.fetchEpicsSwimlanes,
+      {},
+      state,
+      [{ type: types.RECEIVE_SWIMLANES_FAILURE }],
+      [],
       done,
     );
   });
@@ -330,7 +345,7 @@ describe('fetchItemsForList', () => {
     [listId]: pageInfo,
   };
 
-  it('add epicWildcardId with ANY as value when forSwimlanes is true', () => {
+  it('add epicWildcardId with NONE as value when noEpicIssues is true', () => {
     state = {
       ...state,
       isShowingEpicsSwimlanes: true,
@@ -339,7 +354,7 @@ describe('fetchItemsForList', () => {
 
     testAction(
       actions.fetchItemsForList,
-      { listId, forSwimlanes: true },
+      { listId, noEpicIssues: true },
       state,
       [
         {
@@ -348,7 +363,7 @@ describe('fetchItemsForList', () => {
         },
         {
           type: types.RECEIVE_ITEMS_FOR_LIST_SUCCESS,
-          payload: { listItems: formattedIssues, listPageInfo, listId, noEpicIssues: false },
+          payload: { listItems: formattedIssues, listPageInfo, listId, noEpicIssues: true },
         },
       ],
       [],
@@ -358,12 +373,14 @@ describe('fetchItemsForList', () => {
           variables: {
             boardId: 'gid://gitlab/Board/1',
             filters: {
-              epicWildcardId: 'ANY',
+              epicWildcardId: 'NONE',
             },
             fullPath: 'gitlab-org',
             id: 'gid://gitlab/List/1',
             isGroup: true,
             isProject: false,
+            after: undefined,
+            first: 10,
           },
           context: {
             isSingleRequest: true,
@@ -517,6 +534,71 @@ describe('updateListWipLimit', () => {
   });
 });
 
+describe('fetchIssuesForEpic', () => {
+  const listId = mockLists[0].id;
+  const epicId = mockEpic.id;
+
+  const state = {
+    fullPath: 'gitlab-org',
+    boardId: 1,
+    filterParams: {},
+    boardType: 'group',
+  };
+
+  const queryResponse = {
+    data: {
+      group: {
+        board: {
+          lists: {
+            nodes: [
+              {
+                id: listId,
+                issues: {
+                  edges: [{ node: [mockIssue] }],
+                },
+              },
+            ],
+          },
+        },
+      },
+    },
+  };
+
+  const formattedIssues = formatListIssues(queryResponse.data.group.board.lists);
+
+  it('should commit mutations REQUEST_ISSUES_FOR_EPIC and RECEIVE_ITEMS_FOR_LIST_SUCCESS on success', (done) => {
+    jest.spyOn(gqlClient, 'query').mockResolvedValue(queryResponse);
+
+    testAction(
+      actions.fetchIssuesForEpic,
+      epicId,
+      state,
+      [
+        { type: types.REQUEST_ISSUES_FOR_EPIC, payload: epicId },
+        { type: types.RECEIVE_ISSUES_FOR_EPIC_SUCCESS, payload: { ...formattedIssues, epicId } },
+      ],
+      [],
+      done,
+    );
+  });
+
+  it('should commit mutations REQUEST_ISSUES_FOR_EPIC and RECEIVE_ITEMS_FOR_LIST_FAILURE on failure', (done) => {
+    jest.spyOn(gqlClient, 'query').mockResolvedValue(Promise.reject());
+
+    testAction(
+      actions.fetchIssuesForEpic,
+      epicId,
+      state,
+      [
+        { type: types.REQUEST_ISSUES_FOR_EPIC, payload: epicId },
+        { type: types.RECEIVE_ISSUES_FOR_EPIC_FAILURE, payload: epicId },
+      ],
+      [],
+      done,
+    );
+  });
+});
+
 describe('toggleEpicSwimlanes', () => {
   it('should commit mutation TOGGLE_EPICS_SWIMLANES', () => {
     const startURl = `${TEST_HOST}/groups/gitlab-org/-/boards/1?group_by=epic`;

ee/spec/frontend/boards/stores/mutations_spec.js

 import mutations from 'ee/boards/stores/mutations';
-import { mockEpics, mockEpic, mockLists } from '../mock_data';
+import { mockEpics, mockEpic, mockLists, mockIssue, mockIssue2 } from '../mock_data';
 
 const initialBoardListsState = {
   'gid://gitlab/List/1': mockLists[0],
   'gid://gitlab/List/2': mockLists[1],
 };
 
+const epicId = mockEpic.id;
+
 let state = {
   boardItemsByListId: {},
   boardItems: {},
   boardLists: initialBoardListsState,
+  epicsFlags: {
+    [epicId]: { isLoading: true },
+  },
 };
 
 describe('SET_SHOW_LABELS', () => {
@@ -25,6 +30,53 @@ describe('SET_SHOW_LABELS', () => {
   });
 });
 
+describe('REQUEST_ISSUES_FOR_EPIC', () => {
+  it('sets isLoading epicsFlags in state for epicId to true', () => {
+    state = {
+      ...state,
+      epicsFlags: {
+        [epicId]: { isLoading: false },
+      },
+    };
+
+    mutations.REQUEST_ISSUES_FOR_EPIC(state, epicId);
+
+    expect(state.epicsFlags[epicId].isLoading).toBe(true);
+  });
+});
+
+describe('RECEIVE_ISSUES_FOR_EPIC_SUCCESS', () => {
+  it('sets boardItemsByListId and issues state for epic issues and loading state to false', () => {
+    const listIssues = {
+      'gid://gitlab/List/1': [mockIssue.id],
+      'gid://gitlab/List/2': [mockIssue2.id],
+    };
+    const issues = {
+      436: mockIssue,
+      437: mockIssue2,
+    };
+
+    mutations.RECEIVE_ISSUES_FOR_EPIC_SUCCESS(state, {
+      listData: listIssues,
+      boardItems: issues,
+      epicId,
+    });
+
+    expect(state.boardItemsByListId).toEqual(listIssues);
+    expect(state.boardItems).toEqual(issues);
+    expect(state.epicsFlags[epicId].isLoading).toBe(false);
+  });
+});
+
+describe('RECEIVE_ISSUES_FOR_EPIC_FAILURE', () => {
+  it('sets loading state to false for epic and error message', () => {
+    mutations.RECEIVE_ISSUES_FOR_EPIC_FAILURE(state, epicId);
+
+    expect(state.error).toEqual('An error occurred while fetching issues. Please reload the page.');
+    expect(state.epicsFlags[epicId].isLoading).toBe(false);
+  });
+});
+
 describe('TOGGLE_EPICS_SWIMLANES', () => {
   it('toggles isShowingEpicsSwimlanes from true to false', () => {
     state = {
@@ -134,6 +186,21 @@ describe('RECEIVE_SWIMLANES_FAILURE', () => {
   });
 });
 
+describe('REQUEST_MORE_EPICS', () => {
+  it('sets epicLanesFetchMoreInProgress to true', () => {
+    state = {
+      ...state,
+      epicsSwimlanesFetchInProgress: {
+        epicLanesFetchMoreInProgress: false,
+      },
+    };
+
+    mutations.REQUEST_MORE_EPICS(state);
+
+    expect(state.epicsSwimlanesFetchInProgress.epicLanesFetchMoreInProgress).toBe(true);
+  });
+});
+
 describe('RECEIVE_EPICS_SUCCESS', () => {
   it('populates epics and canAdminEpic with payload', () => {
     state = {

ee/spec/support/helpers/board_helpers.rb

@@ -8,4 +8,10 @@ module BoardHelpers
 
     wait_for_requests
   end
+
+  def load_unassigned_issues
+    page.find("[data-testid='unassigned-lane-toggle']").click
+
+    wait_for_requests
+  end
 end

locale/gitlab.pot

@@ -5343,6 +5343,9 @@ msgstr ""
 msgid "Boards|An error occurred while fetching group projects. Please try again."
 msgstr ""
 
+msgid "Boards|An error occurred while fetching issues. Please reload the page."
+msgstr ""
+
 msgid "Boards|An error occurred while fetching labels. Please reload the page."
 msgstr ""
 
@@ -5432,9 +5435,15 @@ msgstr ""
 msgid "Board|Failed to delete board. Please try again."
 msgstr ""
 
+msgid "Board|Load more epics"
+msgstr ""
+
 msgid "Board|Load more issues"
 msgstr ""
 
+msgid "Board|Loading epics"
+msgstr ""
+
 msgid "Bold text"
 msgstr ""
 

spec/features/boards/sidebar_spec.rb

@@ -31,4 +31,12 @@ RSpec.describe 'Project issue boards sidebar', :js do
   def click_first_issue_card
     click_card(first_card)
   end
+
+  def refresh_and_click_first_card
+    page.refresh
+
+    wait_for_requests
+
+    first_card.click
+  end
 end

spec/support/shared_examples/features/sidebar_shared_examples.rb

@@ -175,12 +175,4 @@ RSpec.shared_examples 'issue boards sidebar' do
       end
     end
   end
-
-  def refresh_and_click_first_card
-    page.refresh
-
-    wait_for_requests
-
-    first_card.click
-  end
 end