Show toast when deleting an iteration

ee/app/assets/javascripts/iterations/components/iteration_report.vue

@@ -115,6 +115,7 @@ export default {
           }
 
           this.$router.push('/');
+          this.$toast.show(s__('Iterations|The iteration has been deleted.'));
         })
         .catch((err) => {
           this.error = err;

ee/app/assets/javascripts/iterations/components/iteration_report_without_vue_router.vue

@@ -15,7 +15,7 @@ import { TYPE_ITERATION } from '~/graphql_shared/constants';
 import { convertToGraphQLId } from '~/graphql_shared/utils';
 import { formatDate } from '~/lib/utils/datetime_utility';
 import { visitUrl } from '~/lib/utils/url_utility';
-import { __ } from '~/locale';
+import { __, s__ } from '~/locale';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { Namespace } from '../constants';
 import deleteIteration from '../queries/destroy_iteration.mutation.graphql';
@@ -202,6 +202,8 @@ export default {
           }
 
           this.isEditing = false;
+
+          this.$toast.show(s__('Iterations|The iteration has been deleted.'));
           visitUrl(this.iterationsListPath);
         })
         .catch((err) => {

ee/app/assets/javascripts/iterations/index.js

+import { GlToast } from '@gitlab/ui';
 import Vue from 'vue';
 import VueApollo from 'vue-apollo';
 import createDefaultClient from '~/lib/graphql';
@@ -10,6 +11,7 @@ import Iterations from './components/iterations.vue';
 import { Namespace } from './constants';
 import createRouter from './router';
 
+Vue.use(GlToast);
 Vue.use(VueApollo);
 
 const apolloProvider = new VueApollo({

ee/spec/frontend/iterations/components/iteration_report_spec.js

@@ -21,6 +21,9 @@ const $router = {
     },
   },
 };
+const $toast = {
+  show: jest.fn(),
+};
 
 describe('Iterations report', () => {
   let wrapper;
@@ -72,6 +75,7 @@ describe('Iterations report', () => {
       },
       mocks: {
         $router,
+        $toast,
       },
       stubs: {
         GlLoadingIcon,
@@ -148,6 +152,7 @@ describe('Iterations report', () => {
       await waitForPromises();
 
       expect($router.push).toHaveBeenCalledWith('/');
+      expect($toast.show).toHaveBeenCalledWith('The iteration has been deleted.');
     });
 
     it('shows error when delete fails', async () => {

locale/gitlab.pot

@@ -19192,6 +19192,9 @@ msgstr ""
 msgid "Iterations|The duration for each iteration (in weeks)"
 msgstr ""
 
+msgid "Iterations|The iteration has been deleted."
+msgstr ""
+
 msgid "Iterations|The start date of your first iteration"
 msgstr ""