Add CA duration scatter plot

This commit adds the duration scatter plot to the cycle analytics
feature. It makes use of the already merged stage-dropdown-filter
component.

ee/app/assets/javascripts/analytics/cycle_analytics/components/base.vue

@@ -7,6 +7,8 @@ import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { PROJECTS_PER_PAGE, DEFAULT_DAYS_IN_PAST } from '../constants';
 import GroupsDropdownFilter from '../../shared/components/groups_dropdown_filter.vue';
 import ProjectsDropdownFilter from '../../shared/components/projects_dropdown_filter.vue';
+import Scatterplot from '../../shared/components/scatterplot.vue';
+import StageDropdownFilter from './stage_dropdown_filter.vue';
 import SummaryTable from './summary_table.vue';
 import StageTable from './stage_table.vue';
 import { LAST_ACTIVITY_AT } from '../../shared/constants';
@@ -14,13 +16,15 @@ import { LAST_ACTIVITY_AT } from '../../shared/constants';
 export default {
   name: 'CycleAnalytics',
   components: {
-    GlEmptyState,
     GlLoadingIcon,
+    GlEmptyState,
     GroupsDropdownFilter,
     ProjectsDropdownFilter,
     SummaryTable,
     StageTable,
     GlDaterangePicker,
+    StageDropdownFilter,
+    Scatterplot,
   },
   mixins: [glFeatureFlagsMixin()],
   props: {
@@ -45,9 +49,11 @@ export default {
   },
   computed: {
     ...mapState([
+      'featureFlags',
       'isLoading',
       'isLoadingStage',
       'isLoadingChartData',
+      'isLoadingDurationChart',
       'isEmptyStage',
       'isAddingCustomStage',
       'isSavingCustomStage',
@@ -64,7 +70,13 @@ export default {
       'endDate',
       'tasksByType',
     ]),
-    ...mapGetters(['currentStage', 'defaultStage', 'hasNoAccessError', 'currentGroupPath']),
+    ...mapGetters([
+      'currentStage',
+      'defaultStage',
+      'hasNoAccessError',
+      'currentGroupPath',
+      'durationChartPlottableData',
+    ]),
     shouldRenderEmptyState() {
       return !this.selectedGroup;
     },
@@ -74,17 +86,26 @@ export default {
     shouldDisplayFilters() {
       return this.selectedGroup && !this.errorCode;
     },
+    shouldDisplayDurationChart() {
+      return !this.isLoadingDurationChart && !this.isLoading;
+    },
     dateRange: {
       get() {
         return { startDate: this.startDate, endDate: this.endDate };
       },
       set({ startDate, endDate }) {
-        this.setDateRange({ startDate, endDate });
+        this.setDateRange({
+          startDate,
+          endDate,
+        });
       },
     },
   },
   mounted() {
     this.initDateRange();
+    this.setFeatureFlags({
+      hasDurationChart: this.glFeatures.cycleAnalyticsScatterplotEnabled,
+    });
   },
   methods: {
     ...mapActions([
@@ -95,7 +116,6 @@ export default {
       'setSelectedGroup',
       'setSelectedProjects',
       'setSelectedTimeframe',
-      'fetchStageData',
       'setSelectedStageId',
       'hideCustomStageForm',
       'showCustomStageForm',
@@ -104,6 +124,8 @@ export default {
       'createCustomStage',
       'updateStage',
       'removeStage',
+      'updateSelectedDurationChartStages',
+      'setFeatureFlags',
     ]),
     onGroupSelect(group) {
       this.setSelectedGroup(group);
@@ -136,6 +158,9 @@ export default {
     onRemoveStage(id) {
       this.removeStage(id);
     },
+    onDurationStageSelect(stages) {
+      this.updateSelectedDurationChartStages(stages);
+    },
   },
   groupsQueryParams: {
     min_access_level: featureAccessLevel.EVERYONE,
@@ -238,6 +263,29 @@ export default {
           />
         </div>
       </div>
+      <template v-if="featureFlags.hasDurationChart">
+        <template v-if="shouldDisplayDurationChart">
+          <div class="mt-3 d-flex">
+            <h4 class="mt-0">{{ s__('CycleAnalytics|Days to completion') }}</h4>
+            <stage-dropdown-filter
+              v-if="stages.length"
+              class="ml-auto"
+              :stages="stages"
+              @selected="onDurationStageSelect"
+            />
+          </div>
+          <scatterplot
+            v-if="durationChartPlottableData"
+            :x-axis-title="s__('CycleAnalytics|Date')"
+            :y-axis-title="s__('CycleAnalytics|Total days to completion')"
+            :scatter-data="durationChartPlottableData"
+          />
+          <div v-else ref="duration-chart-no-data" class="bs-callout bs-callout-info">
+            {{ __('There is no data available. Please change your selection.') }}
+          </div>
+        </template>
+        <gl-loading-icon v-else-if="!isLoading" size="md" class="my-4 py-4" />
+      </template>
     </div>
   </div>
 </template>

ee/app/assets/javascripts/analytics/cycle_analytics/store/actions.js

+import dateFormat from 'dateformat';
 import createFlash, { hideFlash } from '~/flash';
 import { __ } from '~/locale';
 import Api from 'ee/api';
 import httpStatus from '~/lib/utils/http_status';
 import * as types from './mutation_types';
 import { nestQueryStringKeys } from '../utils';
+import { dateFormats } from '../../shared/constants';
 
 const removeError = () => {
   const flashEl = document.querySelector('.flash-alert');
@@ -11,22 +13,20 @@ const removeError = () => {
     hideFlash(flashEl);
   }
 };
-
+export const setFeatureFlags = ({ commit }, featureFlags) =>
+  commit(types.SET_FEATURE_FLAGS, featureFlags);
 export const setSelectedGroup = ({ commit }, group) => commit(types.SET_SELECTED_GROUP, group);
 export const setSelectedProjects = ({ commit }, projectIds) =>
   commit(types.SET_SELECTED_PROJECTS, projectIds);
 export const setSelectedStageId = ({ commit }, stageId) =>
   commit(types.SET_SELECTED_STAGE_ID, stageId);
 
-export const setDateRange = (
-  { commit, dispatch, state },
-  { skipFetch = false, startDate, endDate },
-) => {
+export const setDateRange = ({ commit, dispatch }, { skipFetch = false, startDate, endDate }) => {
   commit(types.SET_DATE_RANGE, { startDate, endDate });
 
   if (skipFetch) return false;
 
-  return dispatch('fetchCycleAnalyticsData', { state, dispatch });
+  return dispatch('fetchCycleAnalyticsData');
 };
 
 export const requestStageData = ({ commit }) => commit(types.REQUEST_STAGE_DATA);
@@ -56,9 +56,12 @@ export const fetchStageData = ({ state, dispatch, getters }, slug) => {
 };
 
 export const requestCycleAnalyticsData = ({ commit }) => commit(types.REQUEST_CYCLE_ANALYTICS_DATA);
-export const receiveCycleAnalyticsDataSuccess = ({ commit }) =>
+export const receiveCycleAnalyticsDataSuccess = ({ commit, dispatch }) => {
   commit(types.RECEIVE_CYCLE_ANALYTICS_DATA_SUCCESS);
 
+  dispatch('fetchDurationData');
+};
+
 export const receiveCycleAnalyticsDataError = ({ commit }, { response }) => {
   const { status } = response;
   commit(types.RECEIVE_CYCLE_ANALYTICS_DATA_ERROR, status);
@@ -288,3 +291,66 @@ export const removeStage = ({ dispatch, state }, stageId) => {
     .then(() => dispatch('receiveRemoveStageSuccess'))
     .catch(error => dispatch('receiveRemoveStageError', error));
 };
+
+export const requestDurationData = ({ commit }) => commit(types.REQUEST_DURATION_DATA);
+
+export const receiveDurationDataSuccess = ({ commit }, data) =>
+  commit(types.RECEIVE_DURATION_DATA_SUCCESS, data);
+
+export const receiveDurationDataError = ({ commit }) => {
+  commit(types.RECEIVE_DURATION_DATA_ERROR);
+  createFlash(__('There was an error while fetching cycle analytics duration data.'));
+};
+
+export const fetchDurationData = ({ state, dispatch }) => {
+  dispatch('requestDurationData');
+
+  const {
+    featureFlags: { hasDurationChart },
+    stages,
+    startDate,
+    endDate,
+    selectedProjectIds,
+    selectedGroup: { fullPath },
+  } = state;
+
+  if (hasDurationChart) {
+    return Promise.all(
+      stages.map(stage => {
+        const { slug } = stage;
+
+        return Api.cycleAnalyticsDurationChart(slug, {
+          group_id: fullPath,
+          created_after: dateFormat(startDate, dateFormats.isoDate),
+          created_before: dateFormat(endDate, dateFormats.isoDate),
+          project_ids: selectedProjectIds,
+        }).then(({ data }) => ({
+          slug,
+          selected: true,
+          data,
+        }));
+      }),
+    )
+      .then(data => {
+        dispatch('receiveDurationDataSuccess', data);
+      })
+      .catch(() => dispatch('receiveDurationDataError'));
+  }
+  return false;
+};
+
+export const updateSelectedDurationChartStages = ({ state, commit }, stages) => {
+  const updatedDurationStageData = state.durationData.map(stage => {
+    const selected = stages.reduce((result, object) => {
+      if (object.slug === stage.slug) return true;
+      return result;
+    }, false);
+
+    return {
+      ...stage,
+      selected,
+    };
+  });
+
+  commit(types.UPDATE_SELECTED_DURATION_CHART_STAGES, updatedDurationStageData);
+};

ee/app/assets/javascripts/analytics/cycle_analytics/store/getters.js

 import dateFormat from 'dateformat';
 import httpStatus from '~/lib/utils/http_status';
 import { dateFormats } from '../../shared/constants';
+import { getDurationChartData } from '../utils';
 
 export const currentStage = ({ stages, selectedStageId }) =>
   stages.length && selectedStageId ? stages.find(stage => stage.id === selectedStageId) : null;
@@ -20,3 +21,11 @@ export const cycleAnalyticsRequestParams = ({
   created_after: startDate ? dateFormat(startDate, dateFormats.isoDate) : null,
   created_before: endDate ? dateFormat(endDate, dateFormats.isoDate) : null,
 });
+
+export const durationChartPlottableData = state => {
+  const { durationData, startDate, endDate } = state;
+  const selectedStagesDurationData = durationData.filter(stage => stage.selected);
+  const plottableData = getDurationChartData(selectedStagesDurationData, startDate, endDate);
+
+  return plottableData.length ? plottableData : null;
+};

ee/app/assets/javascripts/analytics/cycle_analytics/store/mutation_types.js

+export const SET_FEATURE_FLAGS = 'SET_FEATURE_FLAGS';
+
 export const SET_SELECTED_GROUP = 'SET_SELECTED_GROUP';
 export const SET_SELECTED_PROJECTS = 'SET_SELECTED_PROJECTS';
 export const SET_SELECTED_STAGE_ID = 'SET_SELECTED_STAGE_ID';
 
 export const SET_DATE_RANGE = 'SET_DATE_RANGE';
 
+export const UPDATE_SELECTED_DURATION_CHART_STAGES = 'UPDATE_SELECTED_DURATION_CHART_STAGES';
+
 export const REQUEST_CYCLE_ANALYTICS_DATA = 'REQUEST_CYCLE_ANALYTICS_DATA';
 export const RECEIVE_CYCLE_ANALYTICS_DATA_SUCCESS = 'RECEIVE_CYCLE_ANALYTICS_DATA_SUCCESS';
 export const RECEIVE_CYCLE_ANALYTICS_DATA_ERROR = 'RECEIVE_CYCLE_ANALYTICS_DATA_ERROR';
@@ -42,3 +46,7 @@ export const RECEIVE_UPDATE_STAGE_RESPONSE = 'RECEIVE_UPDATE_STAGE_RESPONSE';
 
 export const REQUEST_REMOVE_STAGE = 'REQUEST_REMOVE_STAGE';
 export const RECEIVE_REMOVE_STAGE_RESPONSE = 'RECEIVE_REMOVE_STAGE_RESPONSE';
+
+export const REQUEST_DURATION_DATA = 'REQUEST_DURATION_DATA';
+export const RECEIVE_DURATION_DATA_SUCCESS = 'RECEIVE_DURATION_DATA_SUCCESS';
+export const RECEIVE_DURATION_DATA_ERROR = 'RECEIVE_DURATION_DATA_ERROR';

ee/app/assets/javascripts/analytics/cycle_analytics/store/mutations.js

@@ -3,6 +3,9 @@ import * as types from './mutation_types';
 import { transformRawStages } from '../utils';
 
 export default {
+  [types.SET_FEATURE_FLAGS](state, featureFlags) {
+    state.featureFlags = featureFlags;
+  },
   [types.SET_SELECTED_GROUP](state, group) {
     state.selectedGroup = convertObjectPropsToCamelCase(group, { deep: true });
     state.selectedProjectIds = [];
@@ -17,6 +20,9 @@ export default {
     state.startDate = startDate;
     state.endDate = endDate;
   },
+  [types.UPDATE_SELECTED_DURATION_CHART_STAGES](state, updatedDurationStageData) {
+    state.durationData = updatedDurationStageData;
+  },
   [types.REQUEST_CYCLE_ANALYTICS_DATA](state) {
     state.isLoading = true;
     state.isAddingCustomStage = false;
@@ -153,4 +159,15 @@ export default {
   [types.RECEIVE_REMOVE_STAGE_RESPONSE](state) {
     state.isLoading = false;
   },
+  [types.REQUEST_DURATION_DATA](state) {
+    state.isLoadingDurationChart = true;
+  },
+  [types.RECEIVE_DURATION_DATA_SUCCESS](state, data) {
+    state.durationData = data;
+    state.isLoadingDurationChart = false;
+  },
+  [types.RECEIVE_DURATION_DATA_ERROR](state) {
+    state.durationData = [];
+    state.isLoadingDurationChart = false;
+  },
 };

ee/app/assets/javascripts/analytics/cycle_analytics/store/state.js

 import { TASKS_BY_TYPE_SUBJECT_ISSUE } from '../constants';
 
 export default () => ({
+  featureFlags: {},
+
   startDate: null,
   endDate: null,
 
   isLoading: false,
   isLoadingStage: false,
   isLoadingChartData: false,
+  isLoadingDurationChart: false,
 
   isEmptyStage: false,
   errorCode: null,
@@ -30,4 +33,6 @@ export default () => ({
     labelIds: [],
     data: [],
   },
+
+  durationData: [],
 });

ee/spec/frontend/analytics/cycle_analytics/components/base_spec.js

@@ -13,17 +13,24 @@ import SummaryTable from 'ee/analytics/cycle_analytics/components/summary_table.
 import StageTable from 'ee/analytics/cycle_analytics/components/stage_table.vue';
 import 'bootstrap';
 import '~/gl_dropdown';
+import Scatterplot from 'ee/analytics/shared/components/scatterplot.vue';
 import waitForPromises from 'helpers/wait_for_promises';
 import * as mockData from '../mock_data';
 
 const noDataSvgPath = 'path/to/no/data';
 const noAccessSvgPath = 'path/to/no/access';
 const emptyStateSvgPath = 'path/to/empty/state';
+const baseStagesEndpoint = '/-/analytics/cycle_analytics/stages';
 
 const localVue = createLocalVue();
 localVue.use(Vuex);
 
-function createComponent({ opts = {}, shallow = true, withStageSelected = false } = {}) {
+function createComponent({
+  opts = {},
+  shallow = true,
+  withStageSelected = false,
+  scatterplotEnabled = true,
+} = {}) {
   const func = shallow ? shallowMount : mount;
   const comp = func(Component, {
     localVue,
@@ -33,6 +40,10 @@ function createComponent({ opts = {}, shallow = true, withStageSelected = false
       emptyStateSvgPath,
       noDataSvgPath,
       noAccessSvgPath,
+      baseStagesEndpoint,
+    },
+    provide: {
+      glFeatures: { cycleAnalyticsScatterplotEnabled: scatterplotEnabled },
     },
     ...opts,
   });
@@ -79,6 +90,10 @@ describe('Cycle Analytics component', () => {
     expect(wrapper.find(StageTable).exists()).toBe(flag);
   };
 
+  const displaysDurationScatterPlot = flag => {
+    expect(wrapper.find(Scatterplot).exists()).toBe(flag);
+  };
+
   beforeEach(() => {
     mock = new MockAdapter(axios);
     wrapper = createComponent();
@@ -141,6 +156,10 @@ describe('Cycle Analytics component', () => {
       it('does not display the stage table', () => {
         displaysStageTable(false);
       });
+
+      it('does not display the duration scatter plot', () => {
+        displaysDurationScatterPlot(false);
+      });
     });
 
     describe('after a filter has been selected', () => {
@@ -181,6 +200,39 @@ describe('Cycle Analytics component', () => {
           expect(wrapper.find('.js-add-stage-button').exists()).toBe(false);
         });
 
+        describe('with no durationData', () => {
+          it('displays the duration chart', () => {
+            expect(wrapper.find(Scatterplot).exists()).toBe(false);
+          });
+
+          it('displays the no data message', () => {
+            const element = wrapper.find({ ref: 'duration-chart-no-data' });
+
+            expect(element.exists()).toBe(true);
+            expect(element.text()).toBe(
+              'There is no data available. Please change your selection.',
+            );
+          });
+        });
+
+        describe('with durationData', () => {
+          beforeEach(() => {
+            wrapper.vm.$store.dispatch('setDateRange', {
+              skipFetch: true,
+              startDate: mockData.startDate,
+              endDate: mockData.endDate,
+            });
+            wrapper.vm.$store.dispatch(
+              'receiveDurationDataSuccess',
+              mockData.transformedDurationData,
+            );
+          });
+
+          it('displays the duration chart', () => {
+            expect(wrapper.find(Scatterplot).exists()).toBe(true);
+          });
+        });
+
         describe('StageTable', () => {
           beforeEach(() => {
             mock = new MockAdapter(axios);
@@ -299,7 +351,7 @@ describe('Cycle Analytics component', () => {
   describe('with failed requests while loading', () => {
     const { full_path: groupId } = mockData.group;
 
-    function mockRequestCycleAnalyticsData(overrides = {}) {
+    function mockRequestCycleAnalyticsData(overrides = {}, includeDutationDataRequests = true) {
       const defaultStatus = 200;
       const defaultRequests = {
         fetchSummaryData: {
@@ -321,7 +373,7 @@ describe('Cycle Analytics component', () => {
           status: defaultStatus,
           // default first stage is issue
           endpoint: '/groups/foo/-/cycle_analytics/events/issue.json',
-          response: { ...mockData.issueEvents },
+          response: [...mockData.issueEvents],
         },
         fetchTasksByTypeData: {
           status: defaultStatus,
@@ -334,6 +386,14 @@ describe('Cycle Analytics component', () => {
       Object.values(defaultRequests).forEach(({ endpoint, status, response }) => {
         mock.onGet(endpoint).replyOnce(status, response);
       });
+
+      if (includeDutationDataRequests) {
+        mockData.defaultStages.forEach(stage => {
+          mock
+            .onGet(`${baseStagesEndpoint}/${stage}/duration_chart`)
+            .replyOnce(defaultStatus, [...mockData.rawDurationData]);
+        });
+      }
     }
 
     beforeEach(() => {
@@ -429,5 +489,27 @@ describe('Cycle Analytics component', () => {
 
       return selectGroupAndFindError('There was an error fetching data for the chart');
     });
+
+    it('will display an error if the fetchDurationData request fails', () => {
+      expect(findFlashError()).toBeNull();
+
+      mockRequestCycleAnalyticsData({}, false);
+
+      mockData.defaultStages.forEach(stage => {
+        mock
+          .onGet(`${baseStagesEndpoint}/${stage}/duration_chart`)
+          .replyOnce(httpStatusCodes.NOT_FOUND, {
+            response: { status: httpStatusCodes.NOT_FOUND },
+          });
+      });
+
+      wrapper.vm.onGroupSelect(mockData.group);
+
+      return waitForPromises().catch(() => {
+        expect(findFlashError().innerText.trim()).toEqual(
+          'There was an error while fetching cycle analytics duration data.',
+        );
+      });
+    });
   });
 });

ee/spec/frontend/analytics/cycle_analytics/store/actions_spec.js

@@ -13,6 +13,9 @@ import {
   startDate,
   endDate,
   customizableStagesAndEvents,
+  rawDurationData,
+  transformedDurationData,
+  defaultStages,
 } from '../mock_data';
 
 const stageData = { events: [] };
@@ -24,6 +27,7 @@ const endpoints = {
   groupLabels: `/groups/${group.path}/-/labels`,
   cycleAnalyticsData: `/groups/${group.path}/-/cycle_analytics`,
   stageData: `/groups/${group.path}/-/cycle_analytics/events/${selectedStageSlug}.json`,
+  baseStagesEndpoint: '/-/analytics/cycle_analytics/stages',
 };
 
 const stageEndpoint = ({ stageId }) => `/-/analytics/cycle_analytics/stages/${stageId}`;
@@ -40,6 +44,9 @@ describe('Cycle analytics actions', () => {
     state = {
       stages: [],
       getters,
+      featureFlags: {
+        hasDurationChart: true,
+      },
     };
     mock = new MockAdapter(axios);
   });
@@ -51,6 +58,7 @@ describe('Cycle analytics actions', () => {
 
   it.each`
     action                   | type                       | stateKey                | payload
+    ${'setFeatureFlags'}     | ${'SET_FEATURE_FLAGS'}     | ${'featureFlags'}       | ${{ hasDurationChart: true }}
     ${'setSelectedGroup'}    | ${'SET_SELECTED_GROUP'}    | ${'selectedGroup'}      | ${'someNewGroup'}
     ${'setSelectedProjects'} | ${'SET_SELECTED_PROJECTS'} | ${'selectedProjectIds'} | ${[10, 20, 30, 40]}
     ${'setSelectedStageId'}  | ${'SET_SELECTED_STAGE_ID'} | ${'selectedStageId'}    | ${'someNewGroup'}
@@ -71,14 +79,12 @@ describe('Cycle analytics actions', () => {
 
   describe('setDateRange', () => {
     it('sets the dates as expected and dispatches fetchCycleAnalyticsData', done => {
-      const dispatch = expect.any(Function);
-
       testAction(
         actions.setDateRange,
         { startDate, endDate },
         state,
         [{ type: types.SET_DATE_RANGE, payload: { startDate, endDate } }],
-        [{ type: 'fetchCycleAnalyticsData', payload: { dispatch, state } }],
+        [{ type: 'fetchCycleAnalyticsData' }],
         done,
       );
     });
@@ -230,6 +236,7 @@ describe('Cycle analytics actions', () => {
         fetchSummaryData: overrides.fetchSummaryData || jest.fn().mockResolvedValue(),
         receiveCycleAnalyticsDataSuccess:
           overrides.receiveCycleAnalyticsDataSuccess || jest.fn().mockResolvedValue(),
+        fetchDurationData: overrides.fetchDurationData || jest.fn().mockResolvedValue(),
       };
       return {
         mocks,
@@ -238,7 +245,8 @@ describe('Cycle analytics actions', () => {
           .mockImplementationOnce(mocks.requestCycleAnalyticsData)
           .mockImplementationOnce(mocks.fetchGroupStagesAndEvents)
           .mockImplementationOnce(mocks.fetchSummaryData)
-          .mockImplementationOnce(mocks.receiveCycleAnalyticsDataSuccess),
+          .mockImplementationOnce(mocks.receiveCycleAnalyticsDataSuccess)
+          .mockImplementationOnce(mocks.fetchDurationData),
       };
     }
 
@@ -263,6 +271,7 @@ describe('Cycle analytics actions', () => {
           expect(mocks.fetchGroupStagesAndEvents).toHaveBeenCalled();
           expect(mocks.fetchSummaryData).toHaveBeenCalled();
           expect(mocks.receiveCycleAnalyticsDataSuccess).toHaveBeenCalled();
+          expect(mocks.fetchDurationData).toHaveBeenCalled();
           done();
         })
         .catch(done.fail);
@@ -320,6 +329,34 @@ describe('Cycle analytics actions', () => {
         .catch(done.fail);
     });
 
+    it(`displays an error if fetchDurationData fails`, () => {
+      const { mockDispatchContext } = mockFetchCycleAnalyticsAction({
+        fetchDurationData: actions.fetchDurationData(
+          {
+            dispatch: jest
+              .fn()
+              .mockResolvedValueOnce()
+              .mockImplementation(actions.receiveDurationDataError({ commit: () => {} })),
+            commit: () => {},
+            state: { ...state, endpoints: { cycleAnalyticsStagesPath: '/this/is/fake' } },
+            getters,
+          },
+          {},
+        ),
+      });
+
+      actions.fetchDurationData(
+        {
+          dispatch: mockDispatchContext,
+          state: { ...state, endpoints: { cycleAnalyticsStagesPath: '/this/is/fake' } },
+          commit: () => {},
+        },
+        {},
+      );
+
+      shouldFlashAMessage('There was an error while fetching cycle analytics duration data.');
+    });
+
     describe('with an existing error', () => {
       beforeEach(() => {
         setFixtures('<div class="flash-container"></div>');
@@ -439,6 +476,7 @@ describe('Cycle analytics actions', () => {
     beforeEach(() => {
       setFixtures('<div class="flash-container"></div>');
     });
+
     it(`commits the ${types.RECEIVE_GROUP_STAGES_AND_EVENTS_SUCCESS} mutation`, done => {
       testAction(
         actions.receiveGroupStagesAndEventsSuccess,
@@ -659,4 +697,184 @@ describe('Cycle analytics actions', () => {
       done();
     });
   });
+
+  describe('fetchDurationData', () => {
+    beforeEach(() => {
+      defaultStages.forEach(stage => {
+        mock
+          .onGet(`${endpoints.baseStagesEndpoint}/${stage}/duration_chart`)
+          .replyOnce(200, [...rawDurationData]);
+      });
+    });
+
+    it("dispatches the 'requestDurationData' and 'receiveDurationDataSuccess' actions", done => {
+      const stateWithStages = {
+        ...state,
+        stages: [stages[0], stages[1]],
+        selectedGroup,
+        startDate,
+        endDate,
+      };
+
+      testAction(
+        actions.fetchDurationData,
+        transformedDurationData,
+        stateWithStages,
+        [],
+        [
+          { type: 'requestDurationData' },
+          {
+            type: 'receiveDurationDataSuccess',
+            payload: transformedDurationData,
+          },
+        ],
+        done,
+      );
+    });
+
+    it("dispatches the 'requestDurationData' and 'receiveDurationDataError' actions when there is an error", done => {
+      const brokenState = {
+        ...state,
+        stages: [
+          {
+            slug: 'oops',
+          },
+        ],
+        selectedGroup,
+        startDate,
+        endDate,
+      };
+
+      testAction(
+        actions.fetchDurationData,
+        {},
+        brokenState,
+        [],
+        [{ type: 'requestDurationData' }, { type: 'receiveDurationDataError' }],
+        done,
+      );
+    });
+  });
+
+  describe('receiveDurationDataSuccess', () => {
+    const payload = { durationData: transformedDurationData, isLoadingDurationChart: false };
+
+    testAction(
+      actions.receiveDurationDataSuccess,
+      payload,
+      state,
+      [
+        {
+          type: types.RECEIVE_DURATION_DATA_SUCCESS,
+          payload,
+        },
+      ],
+      [],
+    );
+  });
+
+  describe('receiveDurationDataError', () => {
+    beforeEach(() => {
+      setFixtures('<div class="flash-container"></div>');
+    });
+
+    it("commits the 'RECEIVE_DURATION_DATA_ERROR' mutation", () => {
+      testAction(
+        actions.receiveDurationDataError,
+        {},
+        state,
+        [
+          {
+            type: types.RECEIVE_DURATION_DATA_ERROR,
+          },
+        ],
+        [],
+      );
+    });
+
+    it('will flash an error', () => {
+      actions.receiveDurationDataError({
+        commit: () => {},
+      });
+
+      shouldFlashAMessage('There was an error while fetching cycle analytics duration data.');
+    });
+  });
+
+  describe('updateSelectedDurationChartStages', () => {
+    it("commits the 'UPDATE_SELECTED_DURATION_CHART_STAGES' mutation with all the selected stages in the duration data", () => {
+      const stateWithDurationData = {
+        ...state,
+        durationData: transformedDurationData,
+      };
+
+      testAction(
+        actions.updateSelectedDurationChartStages,
+        [...stages],
+        stateWithDurationData,
+        [
+          {
+            type: types.UPDATE_SELECTED_DURATION_CHART_STAGES,
+            payload: transformedDurationData,
+          },
+        ],
+        [],
+      );
+    });
+
+    it("commits the 'UPDATE_SELECTED_DURATION_CHART_STAGES' mutation with all the selected and deselected stages in the duration data", () => {
+      const stateWithDurationData = {
+        ...state,
+        durationData: transformedDurationData,
+      };
+
+      testAction(
+        actions.updateSelectedDurationChartStages,
+        [stages[0]],
+        stateWithDurationData,
+        [
+          {
+            type: types.UPDATE_SELECTED_DURATION_CHART_STAGES,
+            payload: [
+              transformedDurationData[0],
+              {
+                ...transformedDurationData[1],
+                selected: false,
+              },
+            ],
+          },
+        ],
+        [],
+      );
+    });
+
+    it("commits the 'UPDATE_SELECTED_DURATION_CHART_STAGES' mutation with all deselected stages in the duration data", () => {
+      const stateWithDurationData = {
+        ...state,
+        durationData: transformedDurationData,
+      };
+
+      testAction(
+        actions.updateSelectedDurationChartStages,
+        [],
+        stateWithDurationData,
+        [
+          {
+            type: types.UPDATE_SELECTED_DURATION_CHART_STAGES,
+            payload: [
+              {
+                ...transformedDurationData[0],
+                selected: false,
+              },
+              {
+                ...transformedDurationData[1],
+                selected: false,
+              },
+            ],
+          },
+        ],
+        [],
+      );
+    });
+  });
 });

ee/spec/frontend/analytics/cycle_analytics/store/getters_spec.js

 import * as getters from 'ee/analytics/cycle_analytics/store/getters';
-import { allowedStages as stages, startDate, endDate } from '../mock_data';
+import {
+  allowedStages as stages,
+  startDate,
+  endDate,
+  transformedDurationData,
+  durationChartPlottableData,
+} from '../mock_data';
 
 let state = null;
 const selectedProjectIds = [5, 8, 11];
@@ -135,4 +141,28 @@ describe('Cycle analytics getters', () => {
       expect(getters.cycleAnalyticsRequestParams(state)).toMatchObject({ [param]: value });
     });
   });
+
+  describe('durationChartPlottableData', () => {
+    it('returns plottable data for selected stages', () => {
+      const stateWithDurationData = {
+        startDate,
+        endDate,
+        durationData: transformedDurationData,
+      };
+
+      expect(getters.durationChartPlottableData(stateWithDurationData)).toEqual(
+        durationChartPlottableData,
+      );
+    });
+
+    it('returns null if there is no plottable data for the selected stages', () => {
+      const stateWithDurationData = {
+        startDate,
+        endDate,
+        durationData: [],
+      };
+
+      expect(getters.durationChartPlottableData(stateWithDurationData)).toBeNull();
+    });
+  });
 });

ee/spec/frontend/analytics/cycle_analytics/store/mutations_spec.js

@@ -17,6 +17,7 @@ import {
   endDate,
   customizableStagesAndEvents,
   tasksByTypeData,
+  transformedDurationData,
 } from '../mock_data';
 
 let state = null;
@@ -54,6 +55,8 @@ describe('Cycle analytics mutations', () => {
     ${types.RECEIVE_UPDATE_STAGE_RESPONSE}         | ${'isLoading'}              | ${false}
     ${types.REQUEST_REMOVE_STAGE}                  | ${'isLoading'}              | ${true}
     ${types.RECEIVE_REMOVE_STAGE_RESPONSE}         | ${'isLoading'}              | ${false}
+    ${types.REQUEST_DURATION_DATA}                 | ${'isLoadingDurationChart'} | ${true}
+    ${types.RECEIVE_DURATION_DATA_ERROR}           | ${'isLoadingDurationChart'} | ${false}
   `('$mutation will set $stateKey=$value', ({ mutation, stateKey, value }) => {
     mutations[mutation](state);
 
@@ -62,10 +65,12 @@ describe('Cycle analytics mutations', () => {
 
   it.each`
     mutation                                       | payload                       | expectedState
+    ${types.SET_FEATURE_FLAGS}                     | ${{ hasDurationChart: true }} | ${{ featureFlags: { hasDurationChart: true } }}
     ${types.SET_SELECTED_GROUP}                    | ${{ fullPath: 'cool-beans' }} | ${{ selectedGroup: { fullPath: 'cool-beans' }, selectedProjectIds: [] }}
     ${types.SET_SELECTED_PROJECTS}                 | ${[606, 707, 808, 909]}       | ${{ selectedProjectIds: [606, 707, 808, 909] }}
     ${types.SET_DATE_RANGE}                        | ${{ startDate, endDate }}     | ${{ startDate, endDate }}
     ${types.SET_SELECTED_STAGE_ID}                 | ${'first-stage'}              | ${{ selectedStageId: 'first-stage' }}
+    ${types.UPDATE_SELECTED_DURATION_CHART_STAGES} | ${transformedDurationData}    | ${{ durationData: transformedDurationData }}
   `(
     '$mutation with payload $payload will update state with $expectedState',
     ({ mutation, payload, expectedState }) => {
@@ -243,4 +248,18 @@ describe('Cycle analytics mutations', () => {
       expect(state.tasksByType.data).toEqual(tasksByTypeData);
     });
   });
+
+  describe(`${types.RECEIVE_DURATION_DATA_SUCCESS}`, () => {
+    it('sets the data correctly and falsifies isLoadingDurationChart', () => {
+      const stateWithData = {
+        isLoadingDurationChart: true,
+        durationData: [['something', 'random']],
+      };
+
+      mutations[types.RECEIVE_DURATION_DATA_SUCCESS](stateWithData, transformedDurationData);
+
+      expect(stateWithData.isLoadingDurationChart).toBe(false);
+      expect(stateWithData.durationData).toBe(transformedDurationData);
+    });
+  });
 });

locale/gitlab.pot

@@ -5272,12 +5272,21 @@ msgstr ""
 msgid "CycleAnalytics|All stages"
 msgstr ""
 
+msgid "CycleAnalytics|Date"
+msgstr ""
+
+msgid "CycleAnalytics|Days to completion"
+msgstr ""
+
 msgid "CycleAnalytics|No stages selected"
 msgstr ""
 
 msgid "CycleAnalytics|Stages"
 msgstr ""
 
+msgid "CycleAnalytics|Total days to completion"
+msgstr ""
+
 msgid "CycleAnalytics|group dropdown filter"
 msgstr ""
 
@@ -17642,6 +17651,9 @@ msgstr ""
 msgid "There was an error while fetching cycle analytics data."
 msgstr ""
 
+msgid "There was an error while fetching cycle analytics duration data."
+msgstr ""
+
 msgid "There was an error while fetching cycle analytics summary data."
 msgstr ""