Improve service desk frontend code

Improve code as a result of
https://gitlab.com/gitlab-org/gitlab/-/issues/288339

This commit:

- Fixes `service_desk_root.vue` `incomingEmail` prop from being mutated
- Removes data properties in the Vue root component
- Converts root component props to provide/inject
- Removes an event hub in favour of component events
- Removes service class
- Completely overhauls the related tests

app/assets/javascripts/projects/settings_service_desk/components/service_desk_root.vue

@@ -2,60 +2,42 @@
 import { GlAlert } from '@gitlab/ui';
 import { __, sprintf } from '~/locale';
 import ServiceDeskSetting from './service_desk_setting.vue';
-import ServiceDeskService from '../services/service_desk_service';
-import eventHub from '../event_hub';
+import axios from '~/lib/utils/axios_utils';
 
 export default {
-  name: 'ServiceDeskRoot',
   components: {
     GlAlert,
     ServiceDeskSetting,
   },
-  props: {
+  inject: {
     initialIsEnabled: {
-      type: Boolean,
-      required: true,
+      default: false,
     },
     endpoint: {
-      type: String,
-      required: true,
+      default: '',
     },
-    incomingEmail: {
-      type: String,
-      required: false,
+    initialIncomingEmail: {
       default: '',
     },
     customEmail: {
-      type: String,
-      required: false,
       default: '',
     },
     customEmailEnabled: {
-      type: Boolean,
-      required: false,
+      default: false,
     },
     selectedTemplate: {
-      type: String,
-      required: false,
       default: '',
     },
     outgoingName: {
-      type: String,
-      required: false,
       default: '',
     },
     projectKey: {
-      type: String,
-      required: false,
       default: '',
     },
     templates: {
-      type: Array,
-      required: false,
-      default: () => [],
+      default: [],
     },
   },
-
   data() {
     return {
       isEnabled: this.initialIsEnabled,
@@ -63,28 +45,21 @@ export default {
       isAlertShowing: false,
       alertVariant: 'danger',
       alertMessage: '',
+      incomingEmail: this.initialIncomingEmail,
       updatedCustomEmail: this.customEmail,
     };
   },
-
-  created() {
-    eventHub.$on('serviceDeskEnabledCheckboxToggled', this.onEnableToggled);
-    eventHub.$on('serviceDeskTemplateSave', this.onSaveTemplate);
-    this.service = new ServiceDeskService(this.endpoint);
-  },
-
-  beforeDestroy() {
-    eventHub.$off('serviceDeskEnabledCheckboxToggled', this.onEnableToggled);
-    eventHub.$off('serviceDeskTemplateSave', this.onSaveTemplate);
-  },
-
   methods: {
     onEnableToggled(isChecked) {
       this.isEnabled = isChecked;
       this.incomingEmail = '';
 
-      this.service
-        .toggleServiceDesk(isChecked)
+      const body = {
+        service_desk_enabled: isChecked,
+      };
+
+      return axios
+        .put(this.endpoint, body)
         .then(({ data }) => {
           const email = data.service_desk_address;
           if (isChecked && !email) {
@@ -104,8 +79,16 @@ export default {
 
     onSaveTemplate({ selectedTemplate, outgoingName, projectKey }) {
       this.isTemplateSaving = true;
-      this.service
-        .updateTemplate({ selectedTemplate, outgoingName, projectKey }, this.isEnabled)
+
+      const body = {
+        issue_template_key: selectedTemplate,
+        outgoing_name: outgoingName,
+        project_key: projectKey,
+        service_desk_enabled: this.isEnabled,
+      };
+
+      return axios
+        .put(this.endpoint, body)
         .then(({ data }) => {
           this.updatedCustomEmail = data?.service_desk_address;
           this.showAlert(__('Changes saved.'), 'success');
@@ -150,6 +133,8 @@ export default {
       :initial-project-key="projectKey"
       :templates="templates"
       :is-template-saving="isTemplateSaving"
+      @save="onSaveTemplate"
+      @toggle="onEnableToggled"
     />
   </div>
 </template>

app/assets/javascripts/projects/settings_service_desk/components/service_desk_setting.vue

 <script>
 import { GlButton, GlFormSelect, GlToggle, GlLoadingIcon, GlSprintf } from '@gitlab/ui';
 import { __ } from '~/locale';
-import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
-import eventHub from '../event_hub';
 
 export default {
-  name: 'ServiceDeskSetting',
   components: {
     ClipboardButton,
     GlButton,
@@ -15,7 +12,6 @@ export default {
     GlLoadingIcon,
     GlSprintf,
   },
-  mixins: [glFeatureFlagsMixin()],
   props: {
     isEnabled: {
       type: Boolean,
@@ -84,10 +80,10 @@ export default {
   },
   methods: {
     onCheckboxToggle(isChecked) {
-      eventHub.$emit('serviceDeskEnabledCheckboxToggled', isChecked);
+      this.$emit('toggle', isChecked);
     },
     onSaveTemplate() {
-      eventHub.$emit('serviceDeskTemplateSave', {
+      this.$emit('save', {
         selectedTemplate: this.selectedTemplate,
         outgoingName: this.outgoingName,
         projectKey: this.projectKey,
@@ -111,7 +107,11 @@ export default {
     </label>
     <div v-if="isEnabled" class="row mt-3">
       <div class="col-md-9 mb-0">
-        <strong id="incoming-email-describer" class="d-block mb-1">
+        <strong
+          id="incoming-email-describer"
+          class="gl-display-block gl-mb-1"
+          data-testid="incoming-email-describer"
+        >
           {{ __('Email address to use for Support Desk') }}
         </strong>
         <template v-if="email">
@@ -128,11 +128,7 @@ export default {
               disabled="true"
             />
             <div class="input-group-append">
-              <clipboard-button
-                :title="__('Copy')"
-                :text="email"
-                css-class="input-group-text qa-clipboard-button"
-              />
+              <clipboard-button :title="__('Copy')" :text="email" css-class="input-group-text" />
             </div>
           </div>
           <span v-if="hasCustomEmail" class="form-text text-muted">

app/assets/javascripts/projects/settings_service_desk/event_hub.js

-import createEventHub from '~/helpers/event_hub_factory';
-
-export default createEventHub();

app/assets/javascripts/projects/settings_service_desk/index.js

@@ -3,43 +3,37 @@ import { parseBoolean } from '~/lib/utils/common_utils';
 import ServiceDeskRoot from './components/service_desk_root.vue';
 
 export default () => {
-  const serviceDeskRootElement = document.querySelector('.js-service-desk-setting-root');
-  if (serviceDeskRootElement) {
-    // eslint-disable-next-line no-new
-    new Vue({
-      el: serviceDeskRootElement,
-      components: {
-        ServiceDeskRoot,
-      },
-      data() {
-        const { dataset } = serviceDeskRootElement;
-        return {
-          initialIsEnabled: parseBoolean(dataset.enabled),
-          endpoint: dataset.endpoint,
-          incomingEmail: dataset.incomingEmail,
-          customEmail: dataset.customEmail,
-          customEmailEnabled: parseBoolean(dataset.customEmailEnabled),
-          selectedTemplate: dataset.selectedTemplate,
-          outgoingName: dataset.outgoingName,
-          projectKey: dataset.projectKey,
-          templates: JSON.parse(dataset.templates),
-        };
-      },
-      render(createElement) {
-        return createElement('service-desk-root', {
-          props: {
-            initialIsEnabled: this.initialIsEnabled,
-            endpoint: this.endpoint,
-            incomingEmail: this.incomingEmail,
-            customEmail: this.customEmail,
-            customEmailEnabled: this.customEmailEnabled,
-            selectedTemplate: this.selectedTemplate,
-            outgoingName: this.outgoingName,
-            projectKey: this.projectKey,
-            templates: this.templates,
-          },
-        });
+  const el = document.querySelector('.js-service-desk-setting-root');
+
+  if (!el) {
+    return false;
+  }
+
+  const {
+    customEmail,
+    customEmailEnabled,
+    enabled,
+    endpoint,
+    incomingEmail,
+    outgoingName,
+    projectKey,
+    selectedTemplate,
+    templates,
+  } = el.dataset;
+
+  return new Vue({
+    el,
+    provide: {
+      customEmail,
+      customEmailEnabled: parseBoolean(customEmailEnabled),
+      endpoint,
+      initialIncomingEmail: incomingEmail,
+      initialIsEnabled: parseBoolean(enabled),
+      outgoingName,
+      projectKey,
+      selectedTemplate,
+      templates: JSON.parse(templates),
     },
+    render: (createElement) => createElement(ServiceDeskRoot),
   });
-  }
 };

app/assets/javascripts/projects/settings_service_desk/services/service_desk_service.js

-import axios from '~/lib/utils/axios_utils';
-
-class ServiceDeskService {
-  constructor(endpoint) {
-    this.endpoint = endpoint;
-  }
-
-  toggleServiceDesk(enable) {
-    return axios.put(this.endpoint, { service_desk_enabled: enable });
-  }
-
-  updateTemplate({ selectedTemplate, outgoingName, projectKey = '' }, isEnabled) {
-    const body = {
-      issue_template_key: selectedTemplate,
-      outgoing_name: outgoingName,
-      project_key: projectKey,
-      service_desk_enabled: isEnabled,
-    };
-    return axios.put(this.endpoint, body);
-  }
-}
-
-export default ServiceDeskService;

spec/frontend/projects/settings_service_desk/components/service_desk_root_spec.js

-import { mount } from '@vue/test-utils';
+import { GlAlert } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
 import AxiosMockAdapter from 'axios-mock-adapter';
 import waitForPromises from 'helpers/wait_for_promises';
-import ServiceDeskRoot from '~/projects/settings_service_desk/components/service_desk_root.vue';
-import ServiceDeskSetting from '~/projects/settings_service_desk/components/service_desk_setting.vue';
 import axios from '~/lib/utils/axios_utils';
 import httpStatusCodes from '~/lib/utils/http_status';
+import ServiceDeskRoot from '~/projects/settings_service_desk/components/service_desk_root.vue';
+import ServiceDeskSetting from '~/projects/settings_service_desk/components/service_desk_setting.vue';
 
 describe('ServiceDeskRoot', () => {
-  const endpoint = '/gitlab-org/gitlab-test/service_desk';
-  const initialIncomingEmail = 'servicedeskaddress@example.com';
   let axiosMock;
   let wrapper;
   let spy;
 
+  const provideData = {
+    customEmail: 'custom.email@example.com',
+    customEmailEnabled: true,
+    endpoint: '/gitlab-org/gitlab-test/service_desk',
+    initialIncomingEmail: 'servicedeskaddress@example.com',
+    initialIsEnabled: true,
+    outgoingName: 'GitLab Support Bot',
+    projectKey: 'key',
+    selectedTemplate: 'Bug',
+    templates: ['Bug', 'Documentation'],
+  };
+
+  const getAlertText = () => wrapper.find(GlAlert).text();
+
+  const createComponent = () => shallowMount(ServiceDeskRoot, { provide: provideData });
+
   beforeEach(() => {
     axiosMock = new AxiosMockAdapter(axios);
+    spy = jest.spyOn(axios, 'put');
   });
 
   afterEach(() => {
@@ -25,156 +41,122 @@ describe('ServiceDeskRoot', () => {
     }
   });
 
-  it('sends a request to toggle service desk off when the toggle is clicked from the on state', () => {
-    axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK);
+  describe('ServiceDeskSetting component', () => {
+    it('is rendered', () => {
+      wrapper = createComponent();
 
-    spy = jest.spyOn(axios, 'put');
-
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: true,
-        initialIncomingEmail,
-        endpoint,
-      },
+      expect(wrapper.find(ServiceDeskSetting).props()).toEqual({
+        customEmail: provideData.customEmail,
+        customEmailEnabled: provideData.customEmailEnabled,
+        incomingEmail: provideData.initialIncomingEmail,
+        initialOutgoingName: provideData.outgoingName,
+        initialProjectKey: provideData.projectKey,
+        initialSelectedTemplate: provideData.selectedTemplate,
+        isEnabled: provideData.initialIsEnabled,
+        isTemplateSaving: false,
+        templates: provideData.templates,
+      });
     });
 
-    wrapper.find('button.gl-toggle').trigger('click');
+    describe('toggle event', () => {
+      describe('when toggling service desk on', () => {
+        beforeEach(async () => {
+          wrapper = createComponent();
 
-    return wrapper.vm
-      .$nextTick()
-      .then(waitForPromises)
-      .then(() => {
-        expect(spy).toHaveBeenCalledWith(endpoint, { service_desk_enabled: false });
-      });
+          wrapper.find(ServiceDeskSetting).vm.$emit('toggle', true);
+
+          await waitForPromises();
         });
 
-  it('sends a request to toggle service desk on when the toggle is clicked from the off state', () => {
-    axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK);
+        it('sends a request to turn service desk on', () => {
+          axiosMock.onPut(provideData.endpoint).replyOnce(httpStatusCodes.OK);
 
-    spy = jest.spyOn(axios, 'put');
-
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: false,
-        initialIncomingEmail: '',
-        endpoint,
-      },
+          expect(spy).toHaveBeenCalledWith(provideData.endpoint, { service_desk_enabled: true });
         });
 
-    wrapper.find('button.gl-toggle').trigger('click');
+        it('shows a message when there is an error', () => {
+          axiosMock.onPut(provideData.endpoint).networkError();
 
-    return wrapper.vm.$nextTick(() => {
-      expect(spy).toHaveBeenCalledWith(endpoint, { service_desk_enabled: true });
+          expect(getAlertText()).toContain('An error occurred while enabling Service Desk.');
+        });
       });
+
+      describe('when toggling service desk off', () => {
+        beforeEach(async () => {
+          wrapper = createComponent();
+
+          wrapper.find(ServiceDeskSetting).vm.$emit('toggle', false);
+
+          await waitForPromises();
         });
 
-  it('shows an error message when there is an issue toggling service desk on', () => {
-    axiosMock.onPut(endpoint).networkError();
+        it('sends a request to turn service desk off', () => {
+          axiosMock.onPut(provideData.endpoint).replyOnce(httpStatusCodes.OK);
 
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: false,
-        initialIncomingEmail: '',
-        endpoint,
-      },
+          expect(spy).toHaveBeenCalledWith(provideData.endpoint, { service_desk_enabled: false });
         });
 
-    wrapper.find('button.gl-toggle').trigger('click');
+        it('shows a message when there is an error', () => {
+          axiosMock.onPut(provideData.endpoint).networkError();
 
-    return wrapper.vm
-      .$nextTick()
-      .then(waitForPromises)
-      .then(() => {
-        expect(wrapper.html()).toContain('An error occurred while enabling Service Desk.');
+          expect(getAlertText()).toContain('An error occurred while disabling Service Desk.');
+        });
       });
     });
 
-  it('sends a request to update template when the "Save template" button is clicked', () => {
-    axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK);
+    describe('save event', () => {
+      describe('successful request', () => {
+        beforeEach(async () => {
+          axiosMock.onPut(provideData.endpoint).replyOnce(httpStatusCodes.OK);
 
-    spy = jest.spyOn(axios, 'put');
+          wrapper = createComponent();
 
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: true,
-        endpoint,
-        initialIncomingEmail,
+          const payload = {
             selectedTemplate: 'Bug',
             outgoingName: 'GitLab Support Bot',
-        templates: ['Bug', 'Documentation'],
             projectKey: 'key',
-      },
-    });
+          };
 
-    wrapper.find('button.btn-success').trigger('click');
+          wrapper.find(ServiceDeskSetting).vm.$emit('save', payload);
 
-    return wrapper.vm.$nextTick(() => {
-      expect(spy).toHaveBeenCalledWith(endpoint, {
+          await waitForPromises();
+        });
+
+        it('sends a request to update template', async () => {
+          expect(spy).toHaveBeenCalledWith(provideData.endpoint, {
             issue_template_key: 'Bug',
             outgoing_name: 'GitLab Support Bot',
             project_key: 'key',
             service_desk_enabled: true,
           });
         });
-  });
-
-  it('saves the template when the "Save template" button is clicked', () => {
-    axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK);
-
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: true,
-        endpoint,
-        initialIncomingEmail,
-        selectedTemplate: 'Bug',
-        templates: ['Bug', 'Documentation'],
-      },
-    });
 
-    wrapper.find('button.btn-success').trigger('click');
-
-    return wrapper.vm
-      .$nextTick()
-      .then(waitForPromises)
-      .then(() => {
-        expect(wrapper.html()).toContain('Changes saved.');
+        it('shows success message', () => {
+          expect(getAlertText()).toContain('Changes saved.');
         });
       });
 
-  it('shows an error message when there is an issue saving the template', () => {
-    axiosMock.onPut(endpoint).networkError();
+      describe('unsuccessful request', () => {
+        beforeEach(async () => {
+          axiosMock.onPut(provideData.endpoint).networkError();
 
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: true,
-        endpoint,
-        initialIncomingEmail,
+          wrapper = createComponent();
+
+          const payload = {
             selectedTemplate: 'Bug',
-        templates: ['Bug', 'Documentation'],
-      },
-    });
+            outgoingName: 'GitLab Support Bot',
+            projectKey: 'key',
+          };
 
-    wrapper.find('button.btn-success').trigger('click');
+          wrapper.find(ServiceDeskSetting).vm.$emit('save', payload);
 
-    return wrapper.vm
-      .$nextTick()
-      .then(waitForPromises)
-      .then(() => {
-        expect(wrapper.html()).toContain('An error occured while saving changes:');
+          await waitForPromises();
         });
-  });
-
-  it('passes customEmail through updatedCustomEmail correctly', () => {
-    const customEmail = 'foo';
 
-    wrapper = mount(ServiceDeskRoot, {
-      propsData: {
-        initialIsEnabled: true,
-        endpoint,
-        customEmail,
-      },
+        it('shows an error message', () => {
+          expect(getAlertText()).toContain('An error occured while saving changes:');
+        });
+      });
     });
-
-    expect(wrapper.find(ServiceDeskSetting).props('customEmail')).toEqual(customEmail);
   });
 });

spec/frontend/projects/settings_service_desk/components/service_desk_setting_spec.js

 import { shallowMount, mount } from '@vue/test-utils';
-import { GlLoadingIcon } from '@gitlab/ui';
-import eventHub from '~/projects/settings_service_desk/event_hub';
+import { GlButton, GlFormSelect, GlLoadingIcon, GlToggle } from '@gitlab/ui';
+import { nextTick } from 'vue';
+import { extendedWrapper } from 'helpers/vue_test_utils_helper';
 import ServiceDeskSetting from '~/projects/settings_service_desk/components/service_desk_setting.vue';
+import ClipboardButton from '~/vue_shared/components/clipboard_button.vue';
 
 describe('ServiceDeskSetting', () => {
   let wrapper;
 
+  const findButton = () => wrapper.find(GlButton);
+  const findClipboardButton = () => wrapper.find(ClipboardButton);
+  const findIncomingEmail = () => wrapper.findByTestId('incoming-email');
+  const findIncomingEmailLabel = () => wrapper.findByTestId('incoming-email-describer');
+  const findLoadingIcon = () => wrapper.find(GlLoadingIcon);
+  const findTemplateDropdown = () => wrapper.find(GlFormSelect);
+  const findToggle = () => wrapper.find(GlToggle);
+
+  const createComponent = ({ props = {}, mountFunction = shallowMount } = {}) =>
+    extendedWrapper(
+      mountFunction(ServiceDeskSetting, {
+        propsData: {
+          isEnabled: true,
+          ...props,
+        },
+      }),
+    );
+
   afterEach(() => {
     if (wrapper) {
       wrapper.destroy();
     }
   });
 
-  const findTemplateDropdown = () => wrapper.find('#service-desk-template-select');
-  const findIncomingEmail = () => wrapper.find('[data-testid="incoming-email"]');
-
   describe('when isEnabled=true', () => {
     describe('only isEnabled', () => {
       describe('as project admin', () => {
         beforeEach(() => {
-          wrapper = shallowMount(ServiceDeskSetting, {
-            propsData: {
-              isEnabled: true,
-            },
-          });
+          wrapper = createComponent();
         });
 
         it('should see activation checkbox', () => {
-          expect(wrapper.find('#service-desk-checkbox').exists()).toBe(true);
+          expect(findToggle().exists()).toBe(true);
         });
 
         it('should see main panel with the email info', () => {
-          expect(wrapper.find('#incoming-email-describer').exists()).toBe(true);
+          expect(findIncomingEmailLabel().exists()).toBe(true);
         });
 
         it('should see loading spinner and not the incoming email', () => {
-          expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
+          expect(findLoadingIcon().exists()).toBe(true);
           expect(findIncomingEmail().exists()).toBe(false);
         });
       });
     });
 
     describe('service desk toggle', () => {
-      it('emits an event to turn on Service Desk when clicked', () => {
-        const eventSpy = jest.fn();
-        eventHub.$on('serviceDeskEnabledCheckboxToggled', eventSpy);
+      it('emits an event to turn on Service Desk when clicked', async () => {
+        wrapper = createComponent();
 
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: false,
-          },
-        });
-
-        wrapper.find('#service-desk-checkbox').trigger('click');
+        findToggle().vm.$emit('change', true);
 
-        expect(eventSpy).toHaveBeenCalledWith(true);
+        await nextTick();
 
-        eventHub.$off('serviceDeskEnabledCheckboxToggled', eventSpy);
-        eventSpy.mockRestore();
+        expect(wrapper.emitted('toggle')[0]).toEqual([true]);
       });
     });
 
@@ -65,23 +70,23 @@ describe('ServiceDeskSetting', () => {
       const incomingEmail = 'foo@bar.com';
 
       beforeEach(() => {
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-            incomingEmail,
-          },
+        wrapper = createComponent({
+          props: { incomingEmail },
         });
       });
 
       it('should see email and not the loading spinner', () => {
         expect(findIncomingEmail().element.value).toEqual(incomingEmail);
-        expect(wrapper.find(GlLoadingIcon).exists()).toBe(false);
+        expect(findLoadingIcon().exists()).toBe(false);
       });
 
       it('renders a copy to clipboard button', () => {
-        expect(wrapper.find('.qa-clipboard-button').exists()).toBe(true);
-        expect(wrapper.find('.qa-clipboard-button').element.dataset.clipboardText).toBe(
-          incomingEmail,
+        expect(findClipboardButton().exists()).toBe(true);
+        expect(findClipboardButton().props()).toEqual(
+          expect.objectContaining({
+            title: 'Copy',
+            text: incomingEmail,
+          }),
         );
       });
     });
@@ -92,12 +97,8 @@ describe('ServiceDeskSetting', () => {
         const customEmail = 'custom@bar.com';
 
         beforeEach(() => {
-          wrapper = mount(ServiceDeskSetting, {
-            propsData: {
-              isEnabled: true,
-              incomingEmail,
-              customEmail,
-            },
+          wrapper = createComponent({
+            props: { incomingEmail, customEmail },
           });
         });
 
@@ -110,12 +111,8 @@ describe('ServiceDeskSetting', () => {
         const email = 'foo@bar.com';
 
         beforeEach(() => {
-          wrapper = mount(ServiceDeskSetting, {
-            propsData: {
-              isEnabled: true,
-              incomingEmail: email,
-              customEmail: email,
-            },
+          wrapper = createComponent({
+            props: { incomingEmail: email, customEmail: email },
           });
         });
 
@@ -127,21 +124,13 @@ describe('ServiceDeskSetting', () => {
 
     describe('templates dropdown', () => {
       it('renders a dropdown to choose a template', () => {
-        wrapper = shallowMount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-          },
-        });
+        wrapper = createComponent();
 
-        expect(wrapper.find('#service-desk-template-select').exists()).toBe(true);
+        expect(findTemplateDropdown().exists()).toBe(true);
       });
 
       it('renders a dropdown with a default value of ""', () => {
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-          },
-        });
+        wrapper = createComponent({ mountFunction: mount });
 
         expect(findTemplateDropdown().element.value).toEqual('');
       });
@@ -149,23 +138,18 @@ describe('ServiceDeskSetting', () => {
       it('renders a dropdown with a value of "Bug" when it is the initial value', () => {
         const templates = ['Bug', 'Documentation', 'Security release'];
 
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-            initialSelectedTemplate: 'Bug',
-            templates,
-          },
+        wrapper = createComponent({
+          props: { initialSelectedTemplate: 'Bug', templates },
+          mountFunction: mount,
         });
 
         expect(findTemplateDropdown().element.value).toEqual('Bug');
       });
 
       it('renders a dropdown with no options when the project has no templates', () => {
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-            templates: [],
-          },
+        wrapper = createComponent({
+          props: { templates: [] },
+          mountFunction: mount,
         });
 
         // The dropdown by default has one empty option
@@ -174,11 +158,10 @@ describe('ServiceDeskSetting', () => {
 
       it('renders a dropdown with options when the project has templates', () => {
         const templates = ['Bug', 'Documentation', 'Security release'];
-        wrapper = mount(ServiceDeskSetting, {
-          propsData: {
-            isEnabled: true,
-            templates,
-          },
+
+        wrapper = createComponent({
+          props: { templates },
+          mountFunction: mount,
         });
 
         // An empty-named template is prepended so the user can select no template
@@ -199,78 +182,59 @@ describe('ServiceDeskSetting', () => {
 
   describe('save button', () => {
     it('renders a save button to save a template', () => {
-      wrapper = mount(ServiceDeskSetting, {
-        propsData: {
-          isEnabled: true,
-        },
-      });
+      wrapper = createComponent();
 
-      expect(wrapper.find('button.btn-success').text()).toContain('Save changes');
+      expect(findButton().text()).toContain('Save changes');
     });
 
-    it('emits a save event with the chosen template when the save button is clicked', () => {
-      const eventSpy = jest.fn();
-      eventHub.$on('serviceDeskTemplateSave', eventSpy);
-
-      wrapper = mount(ServiceDeskSetting, {
-        propsData: {
-          isEnabled: true,
+    it('emits a save event with the chosen template when the save button is clicked', async () => {
+      wrapper = createComponent({
+        props: {
           initialSelectedTemplate: 'Bug',
           initialOutgoingName: 'GitLab Support Bot',
           initialProjectKey: 'key',
         },
       });
 
-      wrapper.find('button.btn-success').trigger('click');
+      findButton().vm.$emit('click');
 
-      expect(eventSpy).toHaveBeenCalledWith({
+      await nextTick();
+
+      const payload = {
         selectedTemplate: 'Bug',
         outgoingName: 'GitLab Support Bot',
         projectKey: 'key',
-      });
+      };
 
-      eventHub.$off('serviceDeskTemplateSave', eventSpy);
-      eventSpy.mockRestore();
+      expect(wrapper.emitted('save')[0]).toEqual([payload]);
     });
   });
 
   describe('when isEnabled=false', () => {
     beforeEach(() => {
-      wrapper = shallowMount(ServiceDeskSetting, {
-        propsData: {
-          isEnabled: false,
-        },
+      wrapper = createComponent({
+        props: { isEnabled: false },
       });
     });
 
     it('does not render email panel', () => {
-      expect(wrapper.find('#incoming-email-describer').exists()).toBe(false);
+      expect(findIncomingEmailLabel().exists()).toBe(false);
     });
 
     it('does not render template dropdown', () => {
-      expect(wrapper.find('#service-desk-template-select').exists()).toBe(false);
+      expect(findTemplateDropdown().exists()).toBe(false);
     });
 
     it('does not render template save button', () => {
-      expect(wrapper.find('button.btn-success').exists()).toBe(false);
-    });
-
-    it('emits an event to turn on Service Desk when the toggle is clicked', () => {
-      const eventSpy = jest.fn();
-      eventHub.$on('serviceDeskEnabledCheckboxToggled', eventSpy);
-
-      wrapper = mount(ServiceDeskSetting, {
-        propsData: {
-          isEnabled: true,
-        },
+      expect(findButton().exists()).toBe(false);
     });
 
-      wrapper.find('#service-desk-checkbox').trigger('click');
+    it('emits an event to turn on Service Desk when the toggle is clicked', async () => {
+      findToggle().vm.$emit('change', false);
 
-      expect(eventSpy).toHaveBeenCalledWith(false);
+      await nextTick();
 
-      eventHub.$off('serviceDeskEnabledCheckboxToggled', eventSpy);
-      eventSpy.mockRestore();
+      expect(wrapper.emitted('toggle')[0]).toEqual([false]);
     });
   });
 });

spec/frontend/projects/settings_service_desk/services/service_desk_service_spec.js

-import AxiosMockAdapter from 'axios-mock-adapter';
-import ServiceDeskService from '~/projects/settings_service_desk/services/service_desk_service';
-import axios from '~/lib/utils/axios_utils';
-import httpStatusCodes from '~/lib/utils/http_status';
-
-describe('ServiceDeskService', () => {
-  const endpoint = `/gitlab-org/gitlab-test/service_desk`;
-  const dummyResponse = { message: 'Dummy response' };
-  const errorMessage = 'Network Error';
-  let axiosMock;
-  let service;
-
-  beforeEach(() => {
-    axiosMock = new AxiosMockAdapter(axios);
-    service = new ServiceDeskService(endpoint);
-  });
-
-  afterEach(() => {
-    axiosMock.restore();
-  });
-
-  describe('toggleServiceDesk', () => {
-    it('makes a request to set service desk', () => {
-      axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK, dummyResponse);
-
-      return service.toggleServiceDesk(true).then((response) => {
-        expect(response.data).toEqual(dummyResponse);
-      });
-    });
-
-    it('fails on error response', () => {
-      axiosMock.onPut(endpoint).networkError();
-
-      return service.toggleServiceDesk(true).catch((error) => {
-        expect(error.message).toBe(errorMessage);
-      });
-    });
-
-    it('makes a request with the expected body', () => {
-      axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK, dummyResponse);
-
-      const spy = jest.spyOn(axios, 'put');
-
-      service.toggleServiceDesk(true);
-
-      expect(spy).toHaveBeenCalledWith(endpoint, {
-        service_desk_enabled: true,
-      });
-
-      spy.mockRestore();
-    });
-  });
-
-  describe('updateTemplate', () => {
-    it('makes a request to update template', () => {
-      axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK, dummyResponse);
-
-      return service
-        .updateTemplate(
-          {
-            selectedTemplate: 'Bug',
-            outgoingName: 'GitLab Support Bot',
-          },
-          true,
-        )
-        .then((response) => {
-          expect(response.data).toEqual(dummyResponse);
-        });
-    });
-
-    it('fails on error response', () => {
-      axiosMock.onPut(endpoint).networkError();
-
-      return service
-        .updateTemplate(
-          {
-            selectedTemplate: 'Bug',
-            outgoingName: 'GitLab Support Bot',
-          },
-          true,
-        )
-        .catch((error) => {
-          expect(error.message).toBe(errorMessage);
-        });
-    });
-
-    it('makes a request with the expected body', () => {
-      axiosMock.onPut(endpoint).replyOnce(httpStatusCodes.OK, dummyResponse);
-
-      const spy = jest.spyOn(axios, 'put');
-
-      service.updateTemplate(
-        {
-          selectedTemplate: 'Bug',
-          outgoingName: 'GitLab Support Bot',
-          projectKey: 'key',
-        },
-        true,
-      );
-
-      expect(spy).toHaveBeenCalledWith(endpoint, {
-        issue_template_key: 'Bug',
-        outgoing_name: 'GitLab Support Bot',
-        project_key: 'key',
-        service_desk_enabled: true,
-      });
-
-      spy.mockRestore();
-    });
-  });
-});