Frontend for top nav menu redesign

app/assets/javascripts/frequent_items/constants.js

@@ -37,15 +37,16 @@ export const TRANSLATION_KEYS = {
   },
 };
 
-export const FREQUENT_ITEMS_DROPDOWNS = [
-  {
+export const FREQUENT_ITEMS_PROJECTS = {
   namespace: 'projects',
   key: 'project',
   vuexModule: 'frequentProjects',
-  },
-  {
+};
+
+export const FREQUENT_ITEMS_GROUPS = {
   namespace: 'groups',
   key: 'group',
   vuexModule: 'frequentGroups',
-  },
-];
+};
+
+export const FREQUENT_ITEMS_DROPDOWNS = [FREQUENT_ITEMS_PROJECTS, FREQUENT_ITEMS_GROUPS];

app/assets/javascripts/frequent_items/store/index.js

@@ -13,8 +13,7 @@ export const createFrequentItemsModule = (initState = {}) => ({
   state: state(initState),
 });
 
-export const createStore = () => {
-  return new Vuex.Store({
+export const createStoreOptions = () => ({
   modules: FREQUENT_ITEMS_DROPDOWNS.reduce(
     (acc, { namespace, vuexModule }) =>
       Object.assign(acc, {
@@ -22,5 +21,8 @@ export const createStore = () => {
       }),
     {},
   ),
-  });
+});
+
+export const createStore = () => {
+  return new Vuex.Store(createStoreOptions());
 };

app/assets/javascripts/main.js

@@ -35,6 +35,7 @@ import initUsagePingConsent from './usage_ping_consent';
 import GlFieldErrors from './gl_field_errors';
 import initUserPopovers from './user_popovers';
 import initBroadcastNotifications from './broadcast_notification';
+import { initTopNav } from './nav';
 
 import 'ee_else_ce/main_ee';
 
@@ -80,6 +81,7 @@ initRails();
 function deferredInitialisation() {
   const $body = $('body');
 
+  initTopNav();
   initBreadcrumbs();
   initTodoToggle();
   initLogoAnimation();

app/assets/javascripts/nav/components/top_nav_app.vue

+<script>
+import { GlNav, GlNavItemDropdown, GlDropdownForm, GlTooltip } from '@gitlab/ui';
+import { s__ } from '~/locale';
+import TopNavDropdownMenu from './top_nav_dropdown_menu.vue';
+
+const TOOLTIP = s__('TopNav|Switch to...');
+
+export default {
+  components: {
+    GlNav,
+    GlNavItemDropdown,
+    GlDropdownForm,
+    GlTooltip,
+    TopNavDropdownMenu,
+  },
+  props: {
+    navData: {
+      type: Object,
+      required: true,
+    },
+  },
+  methods: {
+    findTooltipTarget() {
+      // ### Why use a target function instead of `v-gl-tooltip`?
+      // To get the tooltip to align correctly, we need it to target the actual
+      // toggle button which we don't directly render.
+      return this.$el.querySelector('.js-top-nav-dropdown-toggle');
+    },
+  },
+  TOOLTIP,
+};
+</script>
+
+<template>
+  <gl-nav class="navbar-sub-nav">
+    <gl-nav-item-dropdown
+      :text="navData.activeTitle"
+      icon="dot-grid"
+      menu-class="gl-mt-3! gl-max-w-none! gl-max-h-none! gl-sm-w-auto!"
+      toggle-class="top-nav-toggle js-top-nav-dropdown-toggle gl-px-3!"
+      no-flip
+    >
+      <gl-dropdown-form>
+        <top-nav-dropdown-menu
+          :primary="navData.primary"
+          :secondary="navData.secondary"
+          :views="navData.views"
+        />
+      </gl-dropdown-form>
+    </gl-nav-item-dropdown>
+    <gl-tooltip
+      boundary="window"
+      :boundary-padding="0"
+      :target="findTooltipTarget"
+      placement="right"
+      :title="$options.TOOLTIP"
+    />
+  </gl-nav>
+</template>

app/assets/javascripts/nav/components/top_nav_container_view.vue

+<script>
+import FrequentItemsApp from '~/frequent_items/components/app.vue';
+import eventHub from '~/frequent_items/event_hub';
+import VuexModuleProvider from '~/vue_shared/components/vuex_module_provider.vue';
+import TopNavMenuItem from './top_nav_menu_item.vue';
+
+export default {
+  components: {
+    FrequentItemsApp,
+    TopNavMenuItem,
+    VuexModuleProvider,
+  },
+  props: {
+    frequentItemsVuexModule: {
+      type: String,
+      required: true,
+    },
+    frequentItemsDropdownType: {
+      type: String,
+      required: true,
+    },
+    linksPrimary: {
+      type: Array,
+      required: false,
+      default: () => [],
+    },
+    linksSecondary: {
+      type: Array,
+      required: false,
+      default: () => [],
+    },
+  },
+  computed: {
+    linkGroups() {
+      return [
+        { key: 'primary', links: this.linksPrimary },
+        { key: 'secondary', links: this.linksSecondary },
+      ].filter((x) => x.links?.length);
+    },
+  },
+  mounted() {
+    // For historic reasons, the frequent-items-app component requires this too start up.
+    this.$nextTick(() => {
+      eventHub.$emit(`${this.frequentItemsDropdownType}-dropdownOpen`);
+    });
+  },
+};
+</script>
+
+<template>
+  <div class="top-nav-container-view gl-display-flex gl-flex-direction-column">
+    <div class="frequent-items-dropdown-container gl-w-auto">
+      <div class="frequent-items-dropdown-content gl-w-full! gl-pt-0!">
+        <vuex-module-provider :vuex-module="frequentItemsVuexModule">
+          <frequent-items-app v-bind="$attrs" />
+        </vuex-module-provider>
+      </div>
+    </div>
+    <div
+      v-for="({ key, links }, groupIndex) in linkGroups"
+      :key="key"
+      :class="{ 'gl-mt-3': groupIndex !== 0 }"
+      class="gl-mt-auto gl-pt-3 gl-border-1 gl-border-t-solid gl-border-gray-100"
+      data-testid="menu-item-group"
+    >
+      <top-nav-menu-item
+        v-for="(link, linkIndex) in links"
+        :key="link.title"
+        :menu-item="link"
+        :class="{ 'gl-mt-1': linkIndex !== 0 }"
+      />
+    </div>
+  </div>
+</template>

app/assets/javascripts/nav/components/top_nav_dropdown_menu.vue

+<script>
+import { FREQUENT_ITEMS_PROJECTS, FREQUENT_ITEMS_GROUPS } from '~/frequent_items/constants';
+import KeepAliveSlots from '~/vue_shared/components/keep_alive_slots.vue';
+import TopNavContainerView from './top_nav_container_view.vue';
+import TopNavMenuItem from './top_nav_menu_item.vue';
+
+const ACTIVE_CLASS = 'gl-shadow-none! gl-font-weight-bold! active';
+const SECONDARY_GROUP_CLASS = 'gl-pt-3 gl-mt-3 gl-border-1 gl-border-t-solid gl-border-gray-100';
+
+export default {
+  components: {
+    KeepAliveSlots,
+    TopNavContainerView,
+    TopNavMenuItem,
+  },
+  props: {
+    primary: {
+      type: Array,
+      required: false,
+      default: () => [],
+    },
+    secondary: {
+      type: Array,
+      required: false,
+      default: () => [],
+    },
+    views: {
+      type: Object,
+      required: false,
+      default: () => ({}),
+    },
+  },
+  data() {
+    return {
+      activeId: '',
+    };
+  },
+  computed: {
+    menuItemGroups() {
+      return [
+        { key: 'primary', items: this.primary, classes: '' },
+        {
+          key: 'secondary',
+          items: this.secondary,
+          classes: SECONDARY_GROUP_CLASS,
+        },
+      ].filter((x) => x.items?.length);
+    },
+    allMenuItems() {
+      return this.menuItemGroups.flatMap((x) => x.items);
+    },
+    activeMenuItem() {
+      return this.allMenuItems.find((x) => x.id === this.activeId);
+    },
+    activeView() {
+      return this.activeMenuItem?.view;
+    },
+    menuClass() {
+      if (!this.activeView) {
+        return 'gl-w-full';
+      }
+
+      return '';
+    },
+  },
+  created() {
+    // Initialize activeId based on initialization prop
+    this.activeId = this.allMenuItems.find((x) => x.active)?.id;
+  },
+  methods: {
+    onClick({ id, href }) {
+      // If we're a link, let's just do the default behavior so the view won't change
+      if (href) {
+        return;
+      }
+
+      this.activeId = id;
+    },
+    menuItemClasses(menuItem) {
+      if (menuItem.id === this.activeId) {
+        return ACTIVE_CLASS;
+      }
+
+      return '';
+    },
+  },
+  FREQUENT_ITEMS_PROJECTS,
+  FREQUENT_ITEMS_GROUPS,
+  // expose for unit tests
+  ACTIVE_CLASS,
+  SECONDARY_GROUP_CLASS,
+};
+</script>
+
+<template>
+  <div class="gl-display-flex gl-align-items-stretch">
+    <div
+      class="gl-w-grid-size-30 gl-flex-shrink-0 gl-bg-gray-10"
+      :class="menuClass"
+      data-testid="menu-sidebar"
+    >
+      <div
+        class="gl-py-3 gl-px-5 gl-h-full gl-display-flex gl-align-items-stretch gl-flex-direction-column"
+      >
+        <div
+          v-for="group in menuItemGroups"
+          :key="group.key"
+          :class="group.classes"
+          data-testid="menu-item-group"
+        >
+          <top-nav-menu-item
+            v-for="(menu, index) in group.items"
+            :key="menu.id"
+            data-testid="menu-item"
+            :class="[{ 'gl-mt-1': index !== 0 }, menuItemClasses(menu)]"
+            :menu-item="menu"
+            @click="onClick(menu)"
+          />
+        </div>
+      </div>
+    </div>
+    <keep-alive-slots
+      v-show="activeView"
+      :slot-key="activeView"
+      class="gl-w-grid-size-40 gl-overflow-hidden gl-py-3 gl-px-5"
+      data-testid="menu-subview"
+    >
+      <template #projects>
+        <top-nav-container-view
+          :frequent-items-dropdown-type="$options.FREQUENT_ITEMS_PROJECTS.namespace"
+          :frequent-items-vuex-module="$options.FREQUENT_ITEMS_PROJECTS.vuexModule"
+          v-bind="views.projects"
+        />
+      </template>
+      <template #groups>
+        <top-nav-container-view
+          :frequent-items-dropdown-type="$options.FREQUENT_ITEMS_GROUPS.namespace"
+          :frequent-items-vuex-module="$options.FREQUENT_ITEMS_GROUPS.vuexModule"
+          v-bind="views.groups"
+        />
+      </template>
+    </keep-alive-slots>
+  </div>
+</template>

app/assets/javascripts/nav/components/top_nav_menu_item.vue

+<script>
+import { GlButton, GlIcon } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlButton,
+    GlIcon,
+  },
+  props: {
+    menuItem: {
+      type: Object,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <gl-button
+    category="tertiary"
+    :href="menuItem.href"
+    class="top-nav-menu-item gl-display-block"
+    v-on="$listeners"
+  >
+    <span class="gl-display-flex">
+      <gl-icon v-if="menuItem.icon" :name="menuItem.icon" class="gl-mr-2!" />
+      {{ menuItem.title }}
+      <gl-icon v-if="menuItem.view" name="chevron-right" class="gl-ml-auto" />
+    </span>
+  </gl-button>
+</template>

app/assets/javascripts/nav/index.js

+export const initTopNav = async () => {
+  const el = document.getElementById('js-top-nav');
+
+  if (!el) {
+    return;
+  }
+
+  // With combined_menu feature flag, there's a benefit to splitting up the import
+  const { mountTopNav } = await import(/* webpackChunkName: 'top_nav' */ './mount');
+
+  mountTopNav(el);
+};

app/assets/javascripts/nav/mount.js

+import Vue from 'vue';
+import Vuex from 'vuex';
+import App from './components/top_nav_app.vue';
+import { createStore } from './stores';
+
+Vue.use(Vuex);
+
+export const mountTopNav = (el) => {
+  const viewModel = JSON.parse(el.dataset.viewModel);
+  const store = createStore();
+
+  return new Vue({
+    el,
+    store,
+    render(h) {
+      return h(App, {
+        props: {
+          navData: viewModel,
+        },
+      });
+    },
+  });
+};

app/assets/javascripts/nav/stores/index.js

+import Vuex from 'vuex';
+import { createStoreOptions } from '~/frequent_items/store';
+
+export const createStore = () => new Vuex.Store(createStoreOptions());

app/assets/stylesheets/framework/dropdowns.scss

@@ -839,26 +839,27 @@ header.header-content .dropdown-menu.frequent-items-dropdown-menu {
 .frequent-items-dropdown-container {
   display: flex;
   flex-direction: row;
+  height: $grid-size * 40;
+
+  &.with-deprecated-styles {
     width: 500px;
     height: 354px;
 
-  .frequent-items-dropdown-sidebar,
-  .frequent-items-dropdown-content {
-    @include gl-pt-3;
+    .section-header,
+    .frequent-items-list-container li.section-empty {
+      padding: 0 $gl-padding;
     }
 
-  .loading-animation {
-    color: $almost-black;
-  }
+    .search-input-container {
+      position: relative;
+      padding: 4px $gl-padding;
 
-  .frequent-items-dropdown-sidebar {
-    width: 30%;
-    border-right: 1px solid $border-color;
+      .search-icon {
+        position: absolute;
+        top: 13px;
+        right: 25px;
+        color: $gray-300;
       }
-
-  .frequent-items-dropdown-content {
-    position: relative;
-    width: 70%;
     }
 
     @include media-breakpoint-down(xs) {
@@ -878,9 +879,34 @@ header.header-content .dropdown-menu.frequent-items-dropdown-menu {
       }
     }
 
+    .frequent-items-list-container {
+      width: auto;
+      height: auto;
+      padding-bottom: 0;
+    }
+  }
+
+  .frequent-items-dropdown-sidebar,
+  .frequent-items-dropdown-content {
+    @include gl-pt-3;
+  }
+
+  .loading-animation {
+    color: $almost-black;
+  }
+
+  .frequent-items-dropdown-sidebar {
+    width: 30%;
+    border-right: 1px solid $border-color;
+  }
+
+  .frequent-items-dropdown-content {
+    position: relative;
+    width: 70%;
+  }
+
   .section-header,
   .frequent-items-list-container li.section-empty {
-    padding: 0 $gl-padding;
     color: $gl-text-color-secondary;
     font-size: $gl-font-size;
   }
@@ -898,36 +924,16 @@ header.header-content .dropdown-menu.frequent-items-dropdown-menu {
     }
   }
 
-  .search-input-container {
-    position: relative;
-    padding: 4px $gl-padding;
-
-    .search-icon {
-      position: absolute;
-      top: 13px;
-      right: 25px;
-      color: $gray-300;
-    }
-  }
-
   .section-header {
     font-weight: 700;
     margin-top: 8px;
   }
-
-  @include media-breakpoint-down(xs) {
-    .frequent-items-list-container {
-      width: auto;
-      height: auto;
-      padding-bottom: 0;
-    }
-  }
 }
 
 .frequent-items-list-item-container {
   .frequent-items-item-avatar-container,
   .frequent-items-item-metadata-container {
-    float: left;
+    flex-shrink: 0;
   }
 
   .frequent-items-item-metadata-container {

app/assets/stylesheets/framework/header.scss

+$top-nav-hover-bg: var(--indigo-900-alpha-008, $indigo-900-alpha-008) !important;
+
 .navbar-gitlab {
   padding: 0 16px;
   z-index: $header-zindex;
@@ -254,6 +256,7 @@
       }
     }
 
+    .top-nav-toggle,
     > button {
       background: transparent;
       border: 0;
@@ -629,3 +632,36 @@
     }
   }
 }
+
+.top-nav-container-view {
+  .gl-new-dropdown & .gl-search-box-by-type {
+    @include gl-m-0;
+  }
+
+  .frequent-items-list-item-container > a:hover {
+    background-color: $top-nav-hover-bg;
+  }
+}
+
+.top-nav-toggle {
+  .dropdown-icon {
+    @include gl-mr-3;
+  }
+
+  .dropdown-chevron {
+    top: 0;
+  }
+}
+
+.top-nav-menu-item {
+  color: var(--indigo-900, $theme-indigo-900) !important;
+
+  &.active,
+  &:hover {
+    background-color: $top-nav-hover-bg;
+  }
+
+  .gl-icon {
+    color: inherit !important;
+  }
+}

app/assets/stylesheets/framework/variables.scss

@@ -283,6 +283,8 @@ $indigo-700: #4b4ba3;
 $indigo-800: #393982;
 $indigo-900: #292961;
 $indigo-950: #1a1a40;
+// To do this variant right for darkmode, we need to create a variable for it.
+$indigo-900-alpha-008: rgba($indigo-900, 0.08);
 
 $theme-blue-50: #f4f8fc;
 $theme-blue-100: #e6edf5;

app/assets/stylesheets/themes/_dark.scss

@@ -70,6 +70,7 @@ $indigo-700: #a6a6de;
 $indigo-800: #d1d1f0;
 $indigo-900: #ebebfa;
 $indigo-950: #f7f7ff;
+$indigo-900-alpha-008: rgba($indigo-900, 0.08);
 
 $gray-lightest: #222;
 $gray-light: $gray-50;
@@ -160,6 +161,7 @@ body.gl-dark {
   --indigo-800: #{$indigo-800};
   --indigo-900: #{$indigo-900};
   --indigo-950: #{$indigo-950};
+  --indigo-900-alpha-008: #{$indigo-900-alpha-008};
 
   --gl-text-color: #{$gray-900};
   --border-color: #{$border-color};

app/assets/stylesheets/utilities.scss

@@ -189,3 +189,21 @@ $gl-line-height-42: px-to-rem(42px);
 .gl-line-height-42 {
   line-height: $gl-line-height-42;
 }
+
+.gl-w-grid-size-30 {
+  width: $grid-size * 30;
+}
+
+.gl-w-grid-size-40 {
+  width: $grid-size * 40;
+}
+
+// Will be moved to @gitlab/ui in https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/2209
+.gl-max-w-none\! {
+  max-width: none !important;
+}
+
+// Will be moved to @gitlab/ui in https://gitlab.com/gitlab-org/gitlab-ui/-/merge_requests/2209
+.gl-max-h-none\! {
+  max-height: none !important;
+}

app/views/layouts/header/_default.html.haml

@@ -20,7 +20,7 @@
                 = _('Next')
 
         - if Feature.enabled?(:combined_menu, current_user, default_enabled: :yaml)
-          = render "layouts/nav/combined_menu"
+          = render "layouts/nav/top_nav"
         - else
           - if current_user
             = render "layouts/nav/dashboard"

app/views/layouts/nav/_combined_menu.html.haml

-%button{ type: 'button', data: { toggle: "dropdown" } }
-  = sprite_icon('ellipsis_v')
-  = _('Projects')

app/views/layouts/nav/_top_nav.html.haml

+- view_model = top_nav_view_model(project: @project, group: @group)
+%ul.list-unstyled.navbar-sub-nav#js-top-nav{ data: { view_model: view_model.to_json } }
+  %li
+    %a.top-nav-toggle{ href: '#', type: 'button', data: { toggle: "dropdown" } }
+      = sprite_icon('dot-grid', css_class: "dropdown-icon")
+      = view_model[:activeTitle]
+      = sprite_icon('chevron-down')

app/views/layouts/nav/groups_dropdown/_show.html.haml

@@ -3,7 +3,7 @@
 -# Please see [this MR][1] for more context.
 -# [1]: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56587
 - group_meta = { id: @group.id, name: @group.name, namespace: @group.full_name, web_url: group_path(@group), avatar_url: @group.avatar_url } if @group&.persisted?
-.frequent-items-dropdown-container
+.frequent-items-dropdown-container.with-deprecated-styles
   .frequent-items-dropdown-sidebar.qa-groups-dropdown-sidebar
     %ul
       = nav_link(path: 'dashboard/groups#index') do

app/views/layouts/nav/projects_dropdown/_show.html.haml

@@ -3,7 +3,7 @@
 -# Please see [this MR][1] for more context.
 -# [1]: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/56587
 - project_meta = { id: @project.id, name: @project.name, namespace: @project.full_name, web_url: project_path(@project), avatar_url: @project.avatar_url } if @project&.persisted?
-.frequent-items-dropdown-container
+.frequent-items-dropdown-container.with-deprecated-styles
   .frequent-items-dropdown-sidebar.qa-projects-dropdown-sidebar
     %ul
       = nav_link(path: 'dashboard/projects#index') do

locale/gitlab.pot

@@ -34070,6 +34070,9 @@ msgstr ""
 msgid "Too many projects enabled. You will need to manage them via the console or the API."
 msgstr ""
 
+msgid "TopNav|Switch to..."
+msgstr ""
+
 msgid "Topics (optional)"
 msgstr ""
 

spec/features/admin/admin_mode_spec.rb

@@ -20,8 +20,6 @@ RSpec.describe 'Admin mode' do
 
       context 'when not in admin mode' do
         it 'has no leave admin mode button' do
-          pending_on_combined_menu_flag
-
           visit new_admin_session_path
 
           page.within('.navbar-sub-nav') do
@@ -180,8 +178,6 @@ RSpec.describe 'Admin mode' do
       end
 
       it 'shows no admin mode buttons in navbar' do
-        pending_on_combined_menu_flag
-
         visit admin_root_path
 
         page.within('.navbar-sub-nav') do

spec/frontend/nav/components/top_nav_app_spec.js

+import { GlNavItemDropdown, GlTooltip } from '@gitlab/ui';
+import { shallowMount, mount } from '@vue/test-utils';
+import TopNavApp from '~/nav/components/top_nav_app.vue';
+import TopNavDropdownMenu from '~/nav/components/top_nav_dropdown_menu.vue';
+import { TEST_NAV_DATA } from '../mock_data';
+
+describe('~/nav/components/top_nav_app.vue', () => {
+  let wrapper;
+
+  const createComponent = (mountFn = shallowMount) => {
+    wrapper = mountFn(TopNavApp, {
+      propsData: {
+        navData: TEST_NAV_DATA,
+      },
+    });
+  };
+
+  const findNavItemDropdown = () => wrapper.findComponent(GlNavItemDropdown);
+  const findMenu = () => wrapper.findComponent(TopNavDropdownMenu);
+  const findTooltip = () => wrapper.findComponent(GlTooltip);
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders nav item dropdown', () => {
+      expect(findNavItemDropdown().attributes('href')).toBeUndefined();
+      expect(findNavItemDropdown().attributes()).toMatchObject({
+        icon: 'dot-grid',
+        text: TEST_NAV_DATA.activeTitle,
+        'no-flip': '',
+      });
+    });
+
+    it('renders top nav dropdown menu', () => {
+      expect(findMenu().props()).toStrictEqual({
+        primary: TEST_NAV_DATA.primary,
+        secondary: TEST_NAV_DATA.secondary,
+        views: TEST_NAV_DATA.views,
+      });
+    });
+
+    it('renders tooltip', () => {
+      expect(findTooltip().attributes()).toMatchObject({
+        'boundary-padding': '0',
+        placement: 'right',
+        title: TopNavApp.TOOLTIP,
+      });
+    });
+  });
+
+  describe('when full mounted', () => {
+    beforeEach(() => {
+      createComponent(mount);
+    });
+
+    it('has dropdown toggle as tooltip target', () => {
+      const targetFn = findTooltip().props('target');
+
+      expect(targetFn()).toBe(wrapper.find('.js-top-nav-dropdown-toggle').element);
+    });
+  });
+});

spec/frontend/nav/components/top_nav_container_view_spec.js

+import { shallowMount } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import FrequentItemsApp from '~/frequent_items/components/app.vue';
+import { FREQUENT_ITEMS_PROJECTS } from '~/frequent_items/constants';
+import eventHub from '~/frequent_items/event_hub';
+import TopNavContainerView from '~/nav/components/top_nav_container_view.vue';
+import TopNavMenuItem from '~/nav/components/top_nav_menu_item.vue';
+import VuexModuleProvider from '~/vue_shared/components/vuex_module_provider.vue';
+import { TEST_NAV_DATA } from '../mock_data';
+
+const DEFAULT_PROPS = {
+  frequentItemsDropdownType: FREQUENT_ITEMS_PROJECTS.namespace,
+  frequentItemsVuexModule: FREQUENT_ITEMS_PROJECTS.vuexModule,
+  linksPrimary: TEST_NAV_DATA.primary,
+  linksSecondary: TEST_NAV_DATA.secondary,
+};
+const TEST_OTHER_PROPS = {
+  namespace: 'projects',
+  currentUserName: '',
+  currentItem: {},
+};
+
+describe('~/nav/components/top_nav_container_view.vue', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(TopNavContainerView, {
+      propsData: {
+        ...DEFAULT_PROPS,
+        ...TEST_OTHER_PROPS,
+        ...props,
+      },
+    });
+  };
+
+  const findMenuItems = (parent = wrapper) => parent.findAll(TopNavMenuItem);
+  const findMenuItemsModel = (parent = wrapper) =>
+    findMenuItems(parent).wrappers.map((x) => x.props());
+  const findMenuItemGroups = () => wrapper.findAll('[data-testid="menu-item-group"]');
+  const findMenuItemGroupsModel = () => findMenuItemGroups().wrappers.map(findMenuItemsModel);
+  const findFrequentItemsApp = () => {
+    const parent = wrapper.findComponent(VuexModuleProvider);
+
+    return {
+      vuexModule: parent.props('vuexModule'),
+      props: parent.findComponent(FrequentItemsApp).props(),
+    };
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it.each(['projects', 'groups'])(
+    'emits frequent items event to event hub (%s)',
+    async (frequentItemsDropdownType) => {
+      const listener = jest.fn();
+      eventHub.$on(`${frequentItemsDropdownType}-dropdownOpen`, listener);
+      createComponent({ frequentItemsDropdownType });
+
+      expect(listener).not.toHaveBeenCalled();
+
+      await nextTick();
+
+      expect(listener).toHaveBeenCalled();
+    },
+  );
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders frequent items app', () => {
+      expect(findFrequentItemsApp()).toEqual({
+        vuexModule: DEFAULT_PROPS.frequentItemsVuexModule,
+        props: TEST_OTHER_PROPS,
+      });
+    });
+
+    it('renders menu item groups', () => {
+      expect(findMenuItemGroupsModel()).toEqual([
+        TEST_NAV_DATA.primary.map((menuItem) => ({ menuItem })),
+        TEST_NAV_DATA.secondary.map((menuItem) => ({ menuItem })),
+      ]);
+    });
+
+    it('only the first group does not have margin top', () => {
+      expect(findMenuItemGroups().wrappers.map((x) => x.classes('gl-mt-3'))).toEqual([false, true]);
+    });
+
+    it('only the first menu item does not have margin top', () => {
+      const actual = findMenuItems(findMenuItemGroups().at(1)).wrappers.map((x) =>
+        x.classes('gl-mt-1'),
+      );
+
+      expect(actual).toEqual([false, ...TEST_NAV_DATA.secondary.slice(1).fill(true)]);
+    });
+  });
+
+  describe('without secondary links', () => {
+    beforeEach(() => {
+      createComponent({
+        linksSecondary: [],
+      });
+    });
+
+    it('renders one menu item group', () => {
+      expect(findMenuItemGroupsModel()).toEqual([
+        TEST_NAV_DATA.primary.map((menuItem) => ({ menuItem })),
+      ]);
+    });
+  });
+});

spec/frontend/nav/components/top_nav_dropdown_menu_spec.js

+import { shallowMount } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import TopNavDropdownMenu from '~/nav/components/top_nav_dropdown_menu.vue';
+import KeepAliveSlots from '~/vue_shared/components/keep_alive_slots.vue';
+import { TEST_NAV_DATA } from '../mock_data';
+
+const SECONDARY_GROUP_CLASSES = TopNavDropdownMenu.SECONDARY_GROUP_CLASS.split(' ');
+
+describe('~/nav/components/top_nav_dropdown_menu.vue', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(TopNavDropdownMenu, {
+      propsData: {
+        primary: TEST_NAV_DATA.primary,
+        secondary: TEST_NAV_DATA.secondary,
+        views: TEST_NAV_DATA.views,
+        ...props,
+      },
+    });
+  };
+
+  const findMenuItems = (parent = wrapper) => parent.findAll('[data-testid="menu-item"]');
+  const findMenuItemsModel = (parent = wrapper) =>
+    findMenuItems(parent).wrappers.map((x) => ({
+      menuItem: x.props('menuItem'),
+      isActive: x.classes('active'),
+    }));
+  const findMenuItemGroups = () => wrapper.findAll('[data-testid="menu-item-group"]');
+  const findMenuItemGroupsModel = () =>
+    findMenuItemGroups().wrappers.map((x) => ({
+      classes: x.classes(),
+      items: findMenuItemsModel(x),
+    }));
+  const findMenuSidebar = () => wrapper.find('[data-testid="menu-sidebar"]');
+  const findMenuSubview = () => wrapper.findComponent(KeepAliveSlots);
+  const hasFullWidthMenuSidebar = () => findMenuSidebar().classes('gl-w-full');
+
+  const createItemsGroupModelExpectation = ({
+    primary = TEST_NAV_DATA.primary,
+    secondary = TEST_NAV_DATA.secondary,
+    activeIndex = -1,
+  } = {}) => [
+    {
+      classes: [],
+      items: primary.map((menuItem, index) => ({ isActive: index === activeIndex, menuItem })),
+    },
+    {
+      classes: SECONDARY_GROUP_CLASSES,
+      items: secondary.map((menuItem) => ({ isActive: false, menuItem })),
+    },
+  ];
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders menu item groups', () => {
+      expect(findMenuItemGroupsModel()).toEqual(createItemsGroupModelExpectation());
+    });
+
+    it('has full width menu sidebar', () => {
+      expect(hasFullWidthMenuSidebar()).toBe(true);
+    });
+
+    it('renders hidden subview with no slot key', () => {
+      const subview = findMenuSubview();
+
+      expect(subview.isVisible()).toBe(false);
+      expect(subview.props()).toEqual({ slotKey: '' });
+    });
+
+    it('the first menu item in a group does not render margin top', () => {
+      const actual = findMenuItems(findMenuItemGroups().at(0)).wrappers.map((x) =>
+        x.classes('gl-mt-1'),
+      );
+
+      expect(actual).toEqual([false, ...TEST_NAV_DATA.primary.slice(1).fill(true)]);
+    });
+  });
+
+  describe('with pre-initialized active view', () => {
+    const primaryWithActive = [
+      TEST_NAV_DATA.primary[0],
+      {
+        ...TEST_NAV_DATA.primary[1],
+        active: true,
+      },
+      ...TEST_NAV_DATA.primary.slice(2),
+    ];
+
+    beforeEach(() => {
+      createComponent({
+        primary: primaryWithActive,
+      });
+    });
+
+    it('renders menu item groups', () => {
+      expect(findMenuItemGroupsModel()).toEqual(
+        createItemsGroupModelExpectation({ primary: primaryWithActive, activeIndex: 1 }),
+      );
+    });
+
+    it('does not have full width menu sidebar', () => {
+      expect(hasFullWidthMenuSidebar()).toBe(false);
+    });
+
+    it('renders visible subview with slot key', () => {
+      const subview = findMenuSubview();
+
+      expect(subview.isVisible()).toBe(true);
+      expect(subview.props('slotKey')).toBe(primaryWithActive[1].view);
+    });
+
+    it('does not change view if non-view menu item is clicked', async () => {
+      const secondaryLink = findMenuItems().at(primaryWithActive.length);
+
+      // Ensure this doesn't have a view
+      expect(secondaryLink.props('menuItem').view).toBeUndefined();
+
+      secondaryLink.vm.$emit('click');
+
+      await nextTick();
+
+      expect(findMenuSubview().props('slotKey')).toBe(primaryWithActive[1].view);
+    });
+
+    describe('when other view menu item is clicked', () => {
+      let primaryLink;
+
+      beforeEach(async () => {
+        primaryLink = findMenuItems().at(0);
+        primaryLink.vm.$emit('click');
+        await nextTick();
+      });
+
+      it('clicked on link with view', () => {
+        expect(primaryLink.props('menuItem').view).toBeTruthy();
+      });
+
+      it('changes active view', () => {
+        expect(findMenuSubview().props('slotKey')).toBe(primaryWithActive[0].view);
+      });
+
+      it('changes active status on menu item', () => {
+        expect(findMenuItemGroupsModel()).toStrictEqual(
+          createItemsGroupModelExpectation({ primary: primaryWithActive, activeIndex: 0 }),
+        );
+      });
+    });
+  });
+});

spec/frontend/nav/components/top_nav_menu_item_spec.js

+import { GlButton, GlIcon } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
+import TopNavMenuItem from '~/nav/components/top_nav_menu_item.vue';
+
+const TEST_MENU_ITEM = {
+  title: 'Cheeseburger',
+  icon: 'search',
+  href: '/pretty/good/burger',
+  view: 'burger-view',
+};
+
+describe('~/nav/components/top_nav_menu_item.vue', () => {
+  let listener;
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(TopNavMenuItem, {
+      propsData: {
+        menuItem: TEST_MENU_ITEM,
+        ...props,
+      },
+      listeners: {
+        click: listener,
+      },
+    });
+  };
+
+  const findButton = () => wrapper.find(GlButton);
+  const findButtonIcons = () =>
+    findButton()
+      .findAllComponents(GlIcon)
+      .wrappers.map((x) => x.props('name'));
+
+  beforeEach(() => {
+    listener = jest.fn();
+  });
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders button href and text', () => {
+      const button = findButton();
+
+      expect(button.attributes('href')).toBe(TEST_MENU_ITEM.href);
+      expect(button.text()).toBe(TEST_MENU_ITEM.title);
+    });
+
+    it('passes listeners to button', () => {
+      expect(listener).not.toHaveBeenCalled();
+
+      findButton().vm.$emit('click', 'TEST');
+
+      expect(listener).toHaveBeenCalledWith('TEST');
+    });
+  });
+
+  describe.each`
+    desc                      | menuItem                                         | expectedIcons
+    ${'default'}              | ${TEST_MENU_ITEM}                                | ${[TEST_MENU_ITEM.icon, 'chevron-right']}
+    ${'with no icon'}         | ${{ ...TEST_MENU_ITEM, icon: null }}             | ${['chevron-right']}
+    ${'with no view'}         | ${{ ...TEST_MENU_ITEM, view: null }}             | ${[TEST_MENU_ITEM.icon]}
+    ${'with no icon or view'} | ${{ ...TEST_MENU_ITEM, view: null, icon: null }} | ${[]}
+  `('$desc', ({ menuItem, expectedIcons }) => {
+    beforeEach(() => {
+      createComponent({ menuItem });
+    });
+
+    it(`renders expected icons ${JSON.stringify(expectedIcons)}`, () => {
+      expect(findButtonIcons()).toEqual(expectedIcons);
+    });
+  });
+});

spec/frontend/nav/mock_data.js

+import { range } from 'lodash';
+
+export const TEST_NAV_DATA = {
+  activeTitle: 'Test Active Title',
+  primary: [
+    ...['projects', 'groups'].map((view) => ({
+      id: view,
+      href: null,
+      title: view,
+      view,
+    })),
+    ...range(0, 2).map((idx) => ({
+      id: `primary-link-${idx}`,
+      href: `/path/to/primary/${idx}`,
+      title: `Title ${idx}`,
+    })),
+  ],
+  secondary: range(0, 2).map((idx) => ({
+    id: `secondary-link-${idx}`,
+    href: `/path/to/secondary/${idx}`,
+    title: `SecTitle ${idx}`,
+  })),
+  views: {
+    projects: {
+      namespace: 'projects',
+      currentUserName: '',
+      currentItem: {},
+    },
+    groups: {
+      namespace: 'groups',
+      currentUserName: '',
+      currentItem: {},
+    },
+  },
+};