Add locationHash support to DAST scanner-profile library

This commit adds support for linking to a scanner-profile within
the DAST on-demand scanner-profile library by setting a location hash.

ee/app/assets/javascripts/dast_profiles/components/dast_profiles.vue

 <script>
 import * as Sentry from '@sentry/browser';
 import { GlDropdown, GlDropdownItem, GlTab, GlTabs } from '@gitlab/ui';
+import { camelCase, kebabCase } from 'lodash';
 import { s__ } from '~/locale';
+import { getLocationHash } from '~/lib/utils/url_utility';
 import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import ProfilesList from './dast_profiles_list.vue';
 import * as cacheUtils from '../graphql/cache_utils';
@@ -46,11 +48,23 @@ export default {
         glFeatures,
       );
     },
+    tabIndex: {
+      get() {
+        const activeTabIndex = Object.keys(this.profileSettings).indexOf(
+          camelCase(getLocationHash()),
+        );
+
+        return Math.max(0, activeTabIndex);
+      },
+    },
   },
   created() {
     this.addSmartQueriesForEnabledProfileTypes();
   },
   methods: {
+    setLocationHash(profileType) {
+      window.location.hash = kebabCase(profileType);
+    },
     addSmartQueriesForEnabledProfileTypes() {
       Object.values(this.profileSettings).forEach(({ profileType, graphQL: { query } }) => {
         this.makeProfileTypeReactive(profileType);
@@ -227,10 +241,14 @@ export default {
       </p>
     </header>
 
-    <gl-tabs>
-      <gl-tab v-for="(data, profileType) in profileSettings" :key="profileType">
+    <gl-tabs v-model="tabIndex">
+      <gl-tab
+        v-for="(settings, profileType) in profileSettings"
+        :key="profileType"
+        @click="setLocationHash(profileType)"
+      >
         <template #title>
-          <span>{{ profileSettings[profileType].i18n.tabName }}</span>
+          <span>{{ settings.i18n.tabName }}</span>
         </template>
 
         <profiles-list
@@ -241,7 +259,7 @@ export default {
           :is-loading="isLoadingProfiles(profileType)"
           :profiles-per-page="$options.profilesPerPage"
           :profiles="profileTypes[profileType].profiles"
-          :fields="profileSettings[profileType].tableFields"
+          :fields="settings.tableFields"
           @load-more-profiles="fetchMoreProfiles(profileType)"
           @delete-profile="deleteProfile(profileType, $event)"
         />

ee/spec/frontend/dast_profiles/components/dast_profiles_spec.js

-import { mount, shallowMount } from '@vue/test-utils';
+import { mount, shallowMount, createWrapper } from '@vue/test-utils';
 import { within } from '@testing-library/dom';
 import { merge } from 'lodash';
 import { GlDropdown } from '@gitlab/ui';
+import setWindowLocation from 'helpers/set_window_location_helper';
 import DastProfiles from 'ee/dast_profiles/components/dast_profiles.vue';
 
 const TEST_NEW_DAST_SCANNER_PROFILE_PATH = '/-/on_demand_scans/scanner_profiles/new';
@@ -81,6 +82,11 @@ describe('EE - DastProfiles', () => {
   const getDropdownComponent = () => wrapper.find(GlDropdown);
   const getSiteProfilesDropdownItem = text =>
     within(getDropdownComponent().element).queryByText(text);
+  const getTab = ({ tabName, selected }) =>
+    withinComponent().getByRole('tab', {
+      name: tabName,
+      selected,
+    });
 
   afterEach(() => {
     wrapper.destroy();
@@ -124,6 +130,9 @@ describe('EE - DastProfiles', () => {
   });
 
   describe('tabs', () => {
+    const originalLocation = window.location;
+
+    describe('without location hash set', () => {
       beforeEach(() => {
         createFullComponent();
       });
@@ -141,8 +150,8 @@ describe('EE - DastProfiles', () => {
       `(
         'shows a "$tabName" tab which has "selected" set to "$shouldBeSelectedByDefault"',
         ({ tabName, shouldBeSelectedByDefault }) => {
-        const tab = withinComponent().getByRole('tab', {
-          name: tabName,
+          const tab = getTab({
+            tabName,
             selected: shouldBeSelectedByDefault,
           });
 
@@ -151,6 +160,41 @@ describe('EE - DastProfiles', () => {
       );
     });
 
+    describe.each`
+      tabName               | givenLocationHash
+      ${'Site Profiles'}    | ${'site-profiles'}
+      ${'Scanner Profiles'} | ${'scanner-profiles'}
+    `('with location hash set to "$givenLocationHash"', ({ tabName, givenLocationHash }) => {
+      beforeEach(() => {
+        setWindowLocation(`http://foo.com/index#${givenLocationHash}`);
+        createFullComponent();
+      });
+
+      afterEach(() => {
+        window.location = originalLocation;
+      });
+
+      it(`has "${tabName}" selected`, () => {
+        const tab = getTab({
+          tabName,
+          selected: true,
+        });
+
+        expect(tab).not.toBe(null);
+      });
+
+      it('updates the browsers URL to contain the selected tab', () => {
+        window.location.hash = '';
+
+        const tab = getTab({ tabName });
+
+        createWrapper(tab).trigger('click');
+
+        expect(window.location.hash).toBe(givenLocationHash);
+      });
+    });
+  });
+
   describe.each`
     description                | profileType
     ${'Site Profiles List'}    | ${'siteProfiles'}