Added more test coverage

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

@@ -2,6 +2,7 @@ import { mount } 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';
 
@@ -162,4 +163,18 @@ describe('ServiceDeskRoot', () => {
         expect(wrapper.html()).toContain('An error occured while making the changes:');
       });
   });
+
+  it('passes customEmail through updatedCustomEmail correctly', () => {
+    const customEmail = 'foo';
+
+    wrapper = mount(ServiceDeskRoot, {
+      propsData: {
+        initialIsEnabled: true,
+        endpoint,
+        customEmail,
+      },
+    });
+
+    expect(wrapper.find(ServiceDeskSetting).props('customEmail')).toEqual(customEmail);
+  });
 });

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

@@ -85,6 +85,45 @@ describe('ServiceDeskSetting', () => {
       });
     });
 
+    describe('with customEmail', () => {
+      describe('customEmail is different than incomingEmail', () => {
+        const incomingEmail = 'foo@bar.com';
+        const customEmail = 'custom@bar.com';
+
+        beforeEach(() => {
+          wrapper = mount(ServiceDeskSetting, {
+            propsData: {
+              isEnabled: true,
+              incomingEmail,
+              customEmail,
+            },
+          });
+        });
+
+        it('should see custom email', () => {
+          expect(wrapper.find('.incoming-email').element.value).toEqual(customEmail);
+        });
+      });
+
+      describe('customEmail is the same as incomingEmail', () => {
+        const customEmail = 'foo@bar.com';
+
+        beforeEach(() => {
+          wrapper = mount(ServiceDeskSetting, {
+            propsData: {
+              isEnabled: true,
+              incomingEmail: customEmail,
+              customEmail,
+            },
+          });
+        });
+
+        it('should see custom email', () => {
+          expect(wrapper.find('.incoming-email').element.value).toEqual(customEmail);
+        });
+      });
+    });
+
     describe('templates dropdown', () => {
       it('renders a dropdown to choose a template', () => {
         wrapper = shallowMount(ServiceDeskSetting, {