1 files changed, 89 insertions, 0 deletions
diff --git a/spec/frontend/sidebar/components/participants/sidebar_participants_widget_spec.js b/spec/frontend/sidebar/components/participants/sidebar_participants_widget_spec.js
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index 00000000000..57b9a10b23e
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+++ b/spec/frontend/sidebar/components/participants/sidebar_participants_widget_spec.js
@@ -0,0 +1,89 @@
+import { shallowMount } from '@vue/test-utils';
+import Vue from 'vue';
+import VueApollo from 'vue-apollo';
+import createMockApollo from 'helpers/mock_apollo_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import Participants from '~/sidebar/components/participants/participants.vue';
+import SidebarParticipantsWidget from '~/sidebar/components/participants/sidebar_participants_widget.vue';
+import epicParticipantsQuery from '~/sidebar/queries/epic_participants.query.graphql';
+import { epicParticipantsResponse } from '../../mock_data';
+
+Vue.use(VueApollo);
+
+describe('Sidebar Participants Widget', () => {
+  let wrapper;
+  let fakeApollo;
+
+  const findParticipants = () => wrapper.findComponent(Participants);
+
+  const createComponent = ({
+    participantsQueryHandler = jest.fn().mockResolvedValue(epicParticipantsResponse()),
+  } = {}) => {
+    fakeApollo = createMockApollo([[epicParticipantsQuery, participantsQueryHandler]]);
+
+    wrapper = shallowMount(SidebarParticipantsWidget, {
+      apolloProvider: fakeApollo,
+      propsData: {
+        fullPath: 'group',
+        iid: '1',
+        issuableType: 'epic',
+      },
+      stubs: {
+        Participants,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    fakeApollo = null;
+  });
+
+  it('passes a `loading` prop as true to child component when query is loading', () => {
+    createComponent();
+
+    expect(findParticipants().props('loading')).toBe(true);
+  });
+
+  describe('when participants are loaded', () => {
+    beforeEach(() => {
+      createComponent({
+        participantsQueryHandler: jest.fn().mockResolvedValue(epicParticipantsResponse()),
+      });
+      return waitForPromises();
+    });
+
+    it('passes a `loading` prop as false to editable item', () => {
+      expect(findParticipants().props('loading')).toBe(false);
+    });
+
+    it('passes participants to child component', () => {
+      expect(findParticipants().props('participants')).toEqual(
+        epicParticipantsResponse().data.workspace.issuable.participants.nodes,
+      );
+    });
+  });
+
+  describe('when error occurs', () => {
+    it('emits error event with correct parameters', async () => {
+      const mockError = new Error('mayday');
+
+      createComponent({
+        participantsQueryHandler: jest.fn().mockRejectedValue(mockError),
+      });
+
+      await waitForPromises();
+
+      const [
+        [
+          {
+            message,
+            error: { networkError },
+          },
+        ],
+      ] = wrapper.emitted('fetch-error');
+      expect(message).toBe(wrapper.vm.$options.i18n.fetchingError);
+      expect(networkError).toEqual(mockError);
+    });
+  });
+});