Add CA duration chart endpoint

ee/app/assets/javascripts/api.js

@@ -23,6 +23,7 @@ export default {
   cycleAnalyticsGroupStagesAndEventsPath: '/-/analytics/cycle_analytics/stages',
   cycleAnalyticsStageEventsPath: '/groups/:group_id/-/cycle_analytics/events/:stage_id.json',
   cycleAnalyticsStagePath: '/-/analytics/cycle_analytics/stages/:stage_id',
+  cycleAnalyticsDurationChartPath: '/-/analytics/cycle_analytics/stages/:stage_id/duration_chart',
 
   userSubscription(namespaceId) {
     const url = Api.buildUrl(this.subscriptionPath).replace(':id', encodeURIComponent(namespaceId));
@@ -154,6 +155,7 @@ export default {
 
   cycleAnalyticsGroupStagesAndEvents(groupId, params = {}) {
     const url = Api.buildUrl(this.cycleAnalyticsGroupStagesAndEventsPath);
+
     return axios.get(url, {
       params: { group_id: groupId, ...params },
     });
@@ -194,4 +196,12 @@ export default {
       params: { group_id: groupId },
     });
   },
+
+  cycleAnalyticsDurationChart(stageSlug, params = {}) {
+    const url = Api.buildUrl(this.cycleAnalyticsDurationChartPath).replace(':stage_id', stageSlug);
+
+    return axios.get(url, {
+      params,
+    });
+  },
 };

ee/spec/frontend/api_spec.js

@@ -477,5 +477,29 @@ describe('Api', () => {
           .catch(done.fail);
       });
     });
+
+    describe('cycleAnalyticsDurationChart', () => {
+      it('fetches stage duration data', done => {
+        const response = [];
+        const params = {
+          group_id: groupId,
+          created_after: createdAfter,
+          created_before: createdBefore,
+        };
+        const expectedUrl = `${dummyUrlRoot}/-/analytics/cycle_analytics/stages/thursday/duration_chart`;
+        mock.onGet(expectedUrl).reply(200, response);
+
+        Api.cycleAnalyticsDurationChart(stageId, params)
+          .then(responseObj =>
+            expectRequestWithCorrectParameters(responseObj, {
+              response,
+              params,
+              expectedUrl,
+            }),
+          )
+          .then(done)
+          .catch(done.fail);
+      });
+    });
   });
 });