Part 2 - Top nav responsive view

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

 <script>
+import { FREQUENT_ITEMS_PROJECTS, FREQUENT_ITEMS_GROUPS } from '~/frequent_items/constants';
+import { BV_DROPDOWN_SHOW, BV_DROPDOWN_HIDE } from '~/lib/utils/constants';
+import KeepAliveSlots from '~/vue_shared/components/keep_alive_slots.vue';
 import eventHub, { EVENT_RESPONSIVE_TOGGLE } from '../event_hub';
-
-const TEMPORARY_PLACEHOLDER = 'Placeholder for responsive top nav';
+import { resetMenuItemsActive } from '../utils/reset_menu_items_active';
+import ResponsiveHeader from './responsive_header.vue';
+import ResponsiveHome from './responsive_home.vue';
+import TopNavContainerView from './top_nav_container_view.vue';
 
 export default {
+  components: {
+    KeepAliveSlots,
+    ResponsiveHeader,
+    ResponsiveHome,
+    TopNavContainerView,
+  },
   props: {
     navData: {
       type: Object,
       required: true,
     },
   },
+  data() {
+    return {
+      activeView: 'home',
+      hasMobileOverlay: false,
+    };
+  },
+  computed: {
+    nav() {
+      return resetMenuItemsActive(this.navData);
+    },
+  },
   created() {
     eventHub.$on(EVENT_RESPONSIVE_TOGGLE, this.onToggle);
+    this.$root.$on(BV_DROPDOWN_SHOW, this.showMobileOverlay);
+    this.$root.$on(BV_DROPDOWN_HIDE, this.hideMobileOverlay);
   },
   beforeDestroy() {
     eventHub.$off(EVENT_RESPONSIVE_TOGGLE, this.onToggle);
+    this.$root.$off(BV_DROPDOWN_SHOW, this.showMobileOverlay);
+    this.$root.$off(BV_DROPDOWN_HIDE, this.hideMobileOverlay);
   },
   methods: {
     onToggle() {
       document.body.classList.toggle('top-nav-responsive-open');
     },
+    onMenuItemClick({ view }) {
+      if (view) {
+        this.activeView = view;
+      }
+    },
+    showMobileOverlay() {
+      this.hasMobileOverlay = true;
+    },
+    hideMobileOverlay() {
+      this.hasMobileOverlay = false;
+    },
   },
-  TEMPORARY_PLACEHOLDER,
+  FREQUENT_ITEMS_PROJECTS,
+  FREQUENT_ITEMS_GROUPS,
 };
 </script>
 
 <template>
-  <p>{{ $options.TEMPORARY_PLACEHOLDER }}</p>
+  <div>
+    <div
+      class="mobile-overlay"
+      :class="{ 'mobile-nav-open': hasMobileOverlay }"
+      data-testid="mobile-overlay"
+    ></div>
+    <keep-alive-slots :slot-key="activeView">
+      <template #home>
+        <responsive-home :nav-data="nav" @menu-item-click="onMenuItemClick" />
+      </template>
+      <template #projects>
+        <responsive-header @menu-item-click="onMenuItemClick">
+          {{ __('Projects') }}
+        </responsive-header>
+        <top-nav-container-view
+          :frequent-items-dropdown-type="$options.FREQUENT_ITEMS_PROJECTS.namespace"
+          :frequent-items-vuex-module="$options.FREQUENT_ITEMS_PROJECTS.vuexModule"
+          container-class="gl-px-3"
+          v-bind="nav.views.projects"
+        />
+      </template>
+      <template #groups>
+        <responsive-header @menu-item-click="onMenuItemClick">
+          {{ __('Groups') }}
+        </responsive-header>
+        <top-nav-container-view
+          :frequent-items-dropdown-type="$options.FREQUENT_ITEMS_GROUPS.namespace"
+          :frequent-items-vuex-module="$options.FREQUENT_ITEMS_GROUPS.vuexModule"
+          container-class="gl-px-3"
+          v-bind="nav.views.groups"
+        />
+      </template>
+    </keep-alive-slots>
+  </div>
 </template>

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

+<script>
+import { GlTooltipDirective } from '@gitlab/ui';
+import TopNavMenuItem from './top_nav_menu_item.vue';
+
+export default {
+  components: {
+    TopNavMenuItem,
+  },
+  directives: {
+    GlTooltip: GlTooltipDirective,
+  },
+  computed: {
+    menuItem() {
+      return {
+        id: 'home',
+        view: 'home',
+        icon: 'angle-left',
+      };
+    },
+  },
+};
+</script>
+
+<template>
+  <header class="gl-py-4 gl-display-flex gl-align-items-center">
+    <top-nav-menu-item
+      v-gl-tooltip="{ title: s__('TopNav|Go back') }"
+      class="gl-p-3!"
+      :menu-item="menuItem"
+      icon-only
+      @click="$emit('menu-item-click', menuItem)"
+    />
+    <span class="gl-font-size-h2 gl-font-weight-bold gl-ml-2">
+      <slot></slot>
+    </span>
+  </header>
+</template>

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

+<script>
+import { GlTooltipDirective } from '@gitlab/ui';
+import TopNavMenuItem from './top_nav_menu_item.vue';
+import TopNavMenuSections from './top_nav_menu_sections.vue';
+import TopNavNewDropdown from './top_nav_new_dropdown.vue';
+
+const NEW_VIEW = 'new';
+const SEARCH_VIEW = 'search';
+
+export default {
+  components: {
+    TopNavMenuItem,
+    TopNavMenuSections,
+    TopNavNewDropdown,
+  },
+  directives: {
+    GlTooltip: GlTooltipDirective,
+  },
+  props: {
+    navData: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    menuSections() {
+      return [
+        { id: 'primary', menuItems: this.navData.primary },
+        { id: 'secondary', menuItems: this.navData.secondary },
+      ].filter((x) => x.menuItems?.length);
+    },
+    newDropdownViewModel() {
+      return this.navData.views[NEW_VIEW];
+    },
+    searchMenuItem() {
+      return this.navData.views[SEARCH_VIEW];
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <header class="gl-display-flex gl-align-items-center gl-py-4 gl-pl-4">
+      <h1 class="gl-m-0 gl-font-size-h2 gl-reset-color gl-mr-auto">{{ __('Menu') }}</h1>
+      <top-nav-menu-item
+        v-if="searchMenuItem"
+        v-gl-tooltip="{ title: searchMenuItem.title }"
+        class="gl-ml-3"
+        :menu-item="searchMenuItem"
+        icon-only
+      />
+      <top-nav-new-dropdown
+        v-if="newDropdownViewModel"
+        v-gl-tooltip="{ title: newDropdownViewModel.title }"
+        :view-model="newDropdownViewModel"
+        class="gl-ml-3"
+      />
+    </header>
+    <top-nav-menu-sections class="gl-h-full" :sections="menuSections" v-on="$listeners" />
+  </div>
+</template>

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

@@ -20,6 +20,11 @@ export default {
       type: String,
       required: true,
     },
+    containerClass: {
+      type: String,
+      required: false,
+      default: '',
+    },
     linksPrimary: {
       type: Array,
       required: false,
@@ -50,7 +55,11 @@ export default {
 
 <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-container gl-w-auto"
+      :class="containerClass"
+      data-testid="frequent-items-container"
+    >
       <div class="frequent-items-dropdown-content gl-w-full! gl-pt-0!">
         <vuex-module-provider :vuex-module="frequentItemsVuexModule">
           <frequent-items-app v-bind="$attrs" />

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

@@ -16,6 +16,11 @@ export default {
       type: Object,
       required: true,
     },
+    iconOnly: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
   },
   computed: {
     dataAttrs() {
@@ -32,13 +37,16 @@ export default {
     :href="menuItem.href"
     class="top-nav-menu-item gl-display-block"
     :class="[menuItem.css_class, { [$options.ACTIVE_CLASS]: menuItem.active }]"
+    :aria-label="menuItem.title"
     v-bind="dataAttrs"
     v-on="$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" />
+      <gl-icon v-if="menuItem.icon" :name="menuItem.icon" :class="{ 'gl-mr-2!': !iconOnly }" />
+      <template v-if="!iconOnly">
+        {{ menuItem.title }}
+        <gl-icon v-if="menuItem.view" name="chevron-right" class="gl-ml-auto" />
+      </template>
     </span>
   </gl-button>
 </template>

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

@@ -54,6 +54,7 @@ export default {
         :key="menuItem.id"
         :menu-item="menuItem"
         data-testid="menu-item"
+        class="gl-w-full"
         :class="{ 'gl-mt-1': menuItemIndex > 0 }"
         @click="onClick(menuItem)"
       />

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

+<script>
+import { GlDropdown, GlDropdownDivider, GlDropdownItem, GlDropdownSectionHeader } from '@gitlab/ui';
+
+export default {
+  components: {
+    GlDropdown,
+    GlDropdownDivider,
+    GlDropdownItem,
+    GlDropdownSectionHeader,
+  },
+  props: {
+    viewModel: {
+      type: Object,
+      required: true,
+    },
+  },
+  computed: {
+    sections() {
+      return this.viewModel.menu_sections || [];
+    },
+    showHeaders() {
+      return this.sections.length > 1;
+    },
+  },
+};
+</script>
+
+<template>
+  <gl-dropdown
+    toggle-class="top-nav-menu-item"
+    icon="plus"
+    :text="viewModel.title"
+    category="tertiary"
+    text-sr-only
+    no-caret
+    right
+  >
+    <template v-for="({ title, menu_items }, index) in sections">
+      <gl-dropdown-divider v-if="index > 0" :key="`${index}_divider`" data-testid="divider" />
+      <gl-dropdown-section-header v-if="showHeaders" :key="`${index}_header`" data-testid="header">
+        {{ title }}
+      </gl-dropdown-section-header>
+      <template v-for="menuItem in menu_items">
+        <gl-dropdown-item
+          :key="`${index}_item_${menuItem.id}`"
+          link-class="top-nav-menu-item"
+          :href="menuItem.href"
+          data-testid="item"
+        >
+          {{ menuItem.title }}
+        </gl-dropdown-item>
+      </template>
+    </template>
+  </gl-dropdown>
+</template>

app/assets/javascripts/nav/utils/reset_menu_items_active.js

+const resetActiveInArray = (arr) => arr?.map((menuItem) => ({ ...menuItem, active: false }));
+
+/**
+ * This method sets `active: false` for the menu items within the given nav data.
+ *
+ * @returns navData with the menu items updated with `active: false`
+ */
+export const resetMenuItemsActive = ({ primary, secondary, ...navData }) => {
+  return {
+    ...navData,
+    primary: resetActiveInArray(primary),
+    secondary: resetActiveInArray(secondary),
+  };
+};

app/assets/stylesheets/startup/startup-dark.scss

@@ -497,6 +497,9 @@ body {
   color: #dbdbdb;
   vertical-align: baseline;
 }
+.gl-font-sm {
+  font-size: 12px;
+}
 .dropdown {
   position: relative;
 }
@@ -2179,6 +2182,12 @@ body.gl-dark {
   margin-left: 0 !important;
   margin-right: 0 !important;
 }
+.gl-font-sm {
+  font-size: 0.75rem;
+}
+.gl-font-weight-bold {
+  font-weight: 600;
+}
 
 @import "startup/cloaking";
 @include cloak-startup-scss(none);

app/assets/stylesheets/startup/startup-general.scss

@@ -482,6 +482,9 @@ body {
   color: #525252;
   vertical-align: baseline;
 }
+.gl-font-sm {
+  font-size: 12px;
+}
 .dropdown {
   position: relative;
 }
@@ -1962,6 +1965,12 @@ body.sidebar-refactoring
   margin-left: 0 !important;
   margin-right: 0 !important;
 }
+.gl-font-sm {
+  font-size: 0.75rem;
+}
+.gl-font-weight-bold {
+  font-weight: 600;
+}
 
 @import "startup/cloaking";
 @include cloak-startup-scss(none);

app/helpers/nav/top_nav_helper.rb

@@ -4,21 +4,58 @@ module Nav
   module TopNavHelper
     PROJECTS_VIEW = :projects
     GROUPS_VIEW = :groups
+    NEW_VIEW = :new
+    SEARCH_VIEW = :search
 
     def top_nav_view_model(project:, group:)
       builder = ::Gitlab::Nav::TopNavViewModelBuilder.new
 
-      if current_user
-        build_view_model(builder: builder, project: project, group: group)
-      else
-        build_anonymous_view_model(builder: builder)
+      build_base_view_model(builder: builder, project: project, group: group)
+
+      builder.build
+    end
+
+    def top_nav_responsive_view_model(project:, group:)
+      builder = ::Gitlab::Nav::TopNavViewModelBuilder.new
+
+      build_base_view_model(builder: builder, project: project, group: group)
+
+      new_view_model = new_dropdown_view_model(project: project, group: group)
+
+      if new_view_model
+        builder.add_view(NEW_VIEW, new_view_model)
+      end
+
+      if top_nav_show_search
+        builder.add_view(SEARCH_VIEW, ::Gitlab::Nav::TopNavMenuItem.build(**top_nav_search_menu_item_attrs))
       end
 
       builder.build
     end
 
+    def top_nav_show_search
+      header_link?(:search)
+    end
+
+    def top_nav_search_menu_item_attrs
+      {
+        id: 'search',
+        title: _('Search'),
+        icon: 'search',
+        href: search_context.search_url
+      }
+    end
+
     private
 
+    def build_base_view_model(builder:, project:, group:)
+      if current_user
+        build_view_model(builder: builder, project: project, group: group)
+      else
+        build_anonymous_view_model(builder: builder)
+      end
+    end
+
     def build_anonymous_view_model(builder:)
       # These come from `app/views/layouts/nav/_explore.html.ham`
       if explore_nav_link?(:projects)

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

@@ -6,7 +6,7 @@
   %a.gl-sr-only.gl-accessibility{ href: "#content-body" } Skip to content
   .container-fluid
     .header-content
-      .title-container{ class: ('hide-when-menu-expanded' if !use_top_nav_redesign) }
+      .title-container.hide-when-menu-expanded
         %h1.title
           %span.gl-sr-only GitLab
           = link_to root_path, title: _('Dashboard'), id: 'logo', **tracking_attrs('main_navigation', 'click_gitlab_logo_link', 'navigation') do
@@ -33,12 +33,13 @@
         %ul.nav.navbar-nav
           - if current_user
             = render 'layouts/header/new_dropdown', class: ('gl-display-none gl-sm-display-block' if use_top_nav_redesign)
-          - if header_link?(:search)
+          - if top_nav_show_search
+            - search_menu_item = top_nav_search_menu_item_attrs
             %li.nav-item.d-none.d-lg-block.m-auto
               = render 'layouts/search' unless current_controller?(:search)
             %li.nav-item{ class: use_top_nav_redesign ? "gl-display-none gl-sm-display-inline-block gl-lg-display-none" : "gl-display-inline-block gl-lg-display-none" }
-              = link_to search_context.search_url, title: _('Search'), aria: { label: _('Search') }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
-                = sprite_icon('search')
+              = link_to search_menu_item.fetch(:href), title: search_menu_item.fetch(:title), aria: { label: search_menu_item.fetch(:title) }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
+                = sprite_icon(search_menu_item.fetch(:icon))
           - if header_link?(:issues)
             = nav_link(path: 'dashboard#issues', html_options: { class: "user-counter" }) do
               = link_to assigned_issues_dashboard_path, title: _('Issues'), class: 'dashboard-shortcuts-issues', aria: { label: _('Issues') },
@@ -120,9 +121,9 @@
       %button.navbar-toggler.d-block.d-sm-none{ type: 'button', class: ('gl-border-none!' if use_top_nav_redesign) }
         %span.sr-only= _('Toggle navigation')
         - if use_top_nav_redesign
-          %span.more-icon.gl-px-3
+          %span.more-icon.gl-px-3.gl-font-sm.gl-font-weight-bold
             %span.gl-pr-2= _('Menu')
-            = sprite_icon('dot-grid', size: 16)
+            = sprite_icon('hamburger', size: 16)
         - else
           = sprite_icon('ellipsis_h', size: 12, css_class: 'more-icon')
         = sprite_icon('close', size: 12, css_class: 'close-icon')

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

 - return unless Feature.enabled?(:combined_menu, current_user, default_enabled: :yaml)
 
 - top_class = local_assigns.fetch(:class, nil)
-- view_model = top_nav_view_model(project: @project, group: @group)
+- view_model = top_nav_responsive_view_model(project: @project, group: @group)
 
 .top-nav-responsive{ class: top_class }
   #js-top-nav-responsive{ data: { view_model: view_model.to_json } }

ee/app/assets/stylesheets/startup/startup-dark.scss

@@ -497,6 +497,9 @@ body {
   color: #dbdbdb;
   vertical-align: baseline;
 }
+.gl-font-sm {
+  font-size: 12px;
+}
 .dropdown {
   position: relative;
 }
@@ -2179,6 +2182,12 @@ body.gl-dark {
   margin-left: 0 !important;
   margin-right: 0 !important;
 }
+.gl-font-sm {
+  font-size: 0.75rem;
+}
+.gl-font-weight-bold {
+  font-weight: 600;
+}
 
 @import "startup/cloaking";
 @include cloak-startup-scss(none);

ee/app/assets/stylesheets/startup/startup-general.scss

@@ -482,6 +482,9 @@ body {
   color: #525252;
   vertical-align: baseline;
 }
+.gl-font-sm {
+  font-size: 12px;
+}
 .dropdown {
   position: relative;
 }
@@ -1962,6 +1965,12 @@ body.sidebar-refactoring
   margin-left: 0 !important;
   margin-right: 0 !important;
 }
+.gl-font-sm {
+  font-size: 0.75rem;
+}
+.gl-font-weight-bold {
+  font-weight: 600;
+}
 
 @import "startup/cloaking";
 @include cloak-startup-scss(none);

locale/gitlab.pot

@@ -34369,6 +34369,9 @@ msgstr ""
 msgid "Too many projects enabled. You will need to manage them via the console or the API."
 msgstr ""
 
+msgid "TopNav|Go back"
+msgstr ""
+
 msgid "Topics (optional)"
 msgstr ""
 

spec/features/nav/top_nav_responsive_spec.rb

@@ -6,7 +6,6 @@ RSpec.describe 'top nav responsive', :js do
   include MobileHelpers
 
   let_it_be(:user) { create(:user) }
-  let_it_be(:responsive_menu_text) { 'Placeholder for responsive top nav' }
 
   before do
     stub_feature_flags(combined_menu: true)
@@ -20,7 +19,9 @@ RSpec.describe 'top nav responsive', :js do
   context 'before opened' do
     it 'has page content and hides responsive menu', :aggregate_failures do
       expect(page).to have_css('.page-title', text: 'Projects')
-      expect(page).to have_no_text(responsive_menu_text)
+      expect(page).to have_link('Dashboard', id: 'logo')
+
+      expect(page).to have_no_css('.top-nav-responsive')
     end
   end
 
@@ -31,8 +32,22 @@ RSpec.describe 'top nav responsive', :js do
 
     it 'hides everything and shows responsive menu', :aggregate_failures do
       expect(page).to have_no_css('.page-title', text: 'Projects')
-      expect(page).to have_link('Dashboard', id: 'logo')
-      expect(page).to have_text(responsive_menu_text)
+      expect(page).to have_no_link('Dashboard', id: 'logo')
+
+      within '.top-nav-responsive' do
+        expect(page).to have_link(nil, href: search_path)
+        expect(page).to have_button('Projects')
+        expect(page).to have_button('Groups')
+        expect(page).to have_link('Snippets', href: dashboard_snippets_path)
+      end
+    end
+
+    it 'has new dropdown', :aggregate_failures do
+      click_button('New...')
+
+      expect(page).to have_link('New project', href: new_project_path)
+      expect(page).to have_link('New group', href: new_group_path)
+      expect(page).to have_link('New snippet', href: new_snippet_path)
     end
   end
 end

spec/frontend/nav/components/responsive_app_spec.js

 import { shallowMount } from '@vue/test-utils';
 import { range } from 'lodash';
 import ResponsiveApp from '~/nav/components/responsive_app.vue';
+import ResponsiveHeader from '~/nav/components/responsive_header.vue';
+import ResponsiveHome from '~/nav/components/responsive_home.vue';
+import TopNavContainerView from '~/nav/components/top_nav_container_view.vue';
 import eventHub, { EVENT_RESPONSIVE_TOGGLE } from '~/nav/event_hub';
+import { resetMenuItemsActive } from '~/nav/utils/reset_menu_items_active';
+import KeepAliveSlots from '~/vue_shared/components/keep_alive_slots.vue';
 import { TEST_NAV_DATA } from '../mock_data';
 
 describe('~/nav/components/responsive_app.vue', () => {
@@ -12,11 +17,19 @@ describe('~/nav/components/responsive_app.vue', () => {
       propsData: {
         navData: TEST_NAV_DATA,
       },
+      stubs: {
+        KeepAliveSlots,
+      },
     });
   };
   const triggerResponsiveToggle = () => eventHub.$emit(EVENT_RESPONSIVE_TOGGLE);
 
+  const findHome = () => wrapper.findComponent(ResponsiveHome);
+  const findMobileOverlay = () => wrapper.find('[data-testid="mobile-overlay"]');
+  const findSubviewHeader = () => wrapper.findComponent(ResponsiveHeader);
+  const findSubviewContainer = () => wrapper.findComponent(TopNavContainerView);
   const hasBodyResponsiveOpen = () => document.body.classList.contains('top-nav-responsive-open');
+  const hasMobileOverlayVisible = () => findMobileOverlay().classes('mobile-nav-open');
 
   beforeEach(() => {
     // Add test class to reset state + assert that we're adding classes correctly
@@ -32,6 +45,13 @@ describe('~/nav/components/responsive_app.vue', () => {
       createComponent();
     });
 
+    it('shows home by default', () => {
+      expect(findHome().isVisible()).toBe(true);
+      expect(findHome().props()).toEqual({
+        navData: resetMenuItemsActive(TEST_NAV_DATA),
+      });
+    });
+
     it.each`
       times | expectation
       ${0}  | ${false}
@@ -45,6 +65,78 @@ describe('~/nav/components/responsive_app.vue', () => {
         expect(hasBodyResponsiveOpen()).toBe(expectation);
       },
     );
+
+    it.each`
+      events                                          | expectation
+      ${[]}                                           | ${false}
+      ${['bv::dropdown::show']}                       | ${true}
+      ${['bv::dropdown::show', 'bv::dropdown::hide']} | ${false}
+    `(
+      'with root events $events, movile overlay visible = $expectation',
+      async ({ events, expectation }) => {
+        // `await...reduce(async` is like doing an `forEach(async (...))` excpet it works
+        await events.reduce(async (acc, evt) => {
+          await acc;
+
+          wrapper.vm.$root.$emit(evt);
+
+          await wrapper.vm.$nextTick();
+        }, Promise.resolve());
+
+        expect(hasMobileOverlayVisible()).toBe(expectation);
+      },
+    );
+  });
+
+  const projectsContainerProps = {
+    containerClass: 'gl-px-3',
+    frequentItemsDropdownType: ResponsiveApp.FREQUENT_ITEMS_PROJECTS.namespace,
+    frequentItemsVuexModule: ResponsiveApp.FREQUENT_ITEMS_PROJECTS.vuexModule,
+    linksPrimary: TEST_NAV_DATA.views.projects.linksPrimary,
+    linksSecondary: TEST_NAV_DATA.views.projects.linksSecondary,
+  };
+  const groupsContainerProps = {
+    containerClass: 'gl-px-3',
+    frequentItemsDropdownType: ResponsiveApp.FREQUENT_ITEMS_GROUPS.namespace,
+    frequentItemsVuexModule: ResponsiveApp.FREQUENT_ITEMS_GROUPS.vuexModule,
+    linksPrimary: TEST_NAV_DATA.views.groups.linksPrimary,
+    linksSecondary: TEST_NAV_DATA.views.groups.linksSecondary,
+  };
+
+  describe.each`
+    view          | header        | containerProps
+    ${'projects'} | ${'Projects'} | ${projectsContainerProps}
+    ${'groups'}   | ${'Groups'}   | ${groupsContainerProps}
+  `('when menu item with $view is clicked', ({ view, header, containerProps }) => {
+    beforeEach(async () => {
+      createComponent();
+
+      findHome().vm.$emit('menu-item-click', { view });
+
+      await wrapper.vm.$nextTick();
+    });
+
+    it('shows header', () => {
+      expect(findSubviewHeader().text()).toBe(header);
+    });
+
+    it('shows container subview', () => {
+      expect(findSubviewContainer().props()).toEqual(containerProps);
+    });
+
+    it('hides home', () => {
+      expect(findHome().isVisible()).toBe(false);
+    });
+
+    describe('when header back button is clicked', () => {
+      beforeEach(() => {
+        findSubviewHeader().vm.$emit('menu-item-click', { view: 'home' });
+      });
+
+      it('shows home', () => {
+        expect(findHome().isVisible()).toBe(true);
+      });
+    });
   });
 
   describe('when destroyed', () => {

spec/frontend/nav/components/responsive_header_spec.js

+import { shallowMount } from '@vue/test-utils';
+import { createMockDirective, getBinding } from 'helpers/vue_mock_directive';
+import ResponsiveHeader from '~/nav/components/responsive_header.vue';
+import TopNavMenuItem from '~/nav/components/top_nav_menu_item.vue';
+
+const TEST_SLOT_CONTENT = 'Test slot content';
+
+describe('~/nav/components/top_nav_menu_sections.vue', () => {
+  let wrapper;
+
+  const createComponent = () => {
+    wrapper = shallowMount(ResponsiveHeader, {
+      slots: {
+        default: TEST_SLOT_CONTENT,
+      },
+      directives: {
+        GlTooltip: createMockDirective(),
+      },
+    });
+  };
+
+  const findMenuItem = () => wrapper.findComponent(TopNavMenuItem);
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  it('renders slot', () => {
+    expect(wrapper.text()).toBe(TEST_SLOT_CONTENT);
+  });
+
+  it('renders back button', () => {
+    const button = findMenuItem();
+
+    const tooltip = getBinding(button.element, 'gl-tooltip').value.title;
+
+    expect(tooltip).toBe('Go back');
+    expect(button.props()).toEqual({
+      menuItem: {
+        id: 'home',
+        view: 'home',
+        icon: 'angle-left',
+      },
+      iconOnly: true,
+    });
+  });
+
+  it('emits nothing', () => {
+    expect(wrapper.emitted()).toEqual({});
+  });
+
+  describe('when back button is clicked', () => {
+    beforeEach(() => {
+      findMenuItem().vm.$emit('click');
+    });
+
+    it('emits menu-item-click', () => {
+      expect(wrapper.emitted()).toEqual({
+        'menu-item-click': [[{ id: 'home', view: 'home', icon: 'angle-left' }]],
+      });
+    });
+  });
+});

spec/frontend/nav/components/responsive_home_spec.js

+import { shallowMount } from '@vue/test-utils';
+import { createMockDirective, getBinding } from 'helpers/vue_mock_directive';
+import ResponsiveHome from '~/nav/components/responsive_home.vue';
+import TopNavMenuItem from '~/nav/components/top_nav_menu_item.vue';
+import TopNavMenuSections from '~/nav/components/top_nav_menu_sections.vue';
+import TopNavNewDropdown from '~/nav/components/top_nav_new_dropdown.vue';
+import { TEST_NAV_DATA } from '../mock_data';
+
+const TEST_SEARCH_MENU_ITEM = {
+  id: 'search',
+  title: 'search',
+  icon: 'search',
+  href: '/search',
+};
+
+const TEST_NEW_DROPDOWN_VIEW_MODEL = {
+  title: 'new',
+  menu_sections: [],
+};
+
+describe('~/nav/components/responsive_home.vue', () => {
+  let wrapper;
+  let menuItemClickListener;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(ResponsiveHome, {
+      propsData: {
+        navData: TEST_NAV_DATA,
+        ...props,
+      },
+      directives: {
+        GlTooltip: createMockDirective(),
+      },
+      listeners: {
+        'menu-item-click': menuItemClickListener,
+      },
+    });
+  };
+
+  const findSearchMenuItem = () => wrapper.findComponent(TopNavMenuItem);
+  const findNewDropdown = () => wrapper.findComponent(TopNavNewDropdown);
+  const findMenuSections = () => wrapper.findComponent(TopNavMenuSections);
+
+  beforeEach(() => {
+    menuItemClickListener = jest.fn();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it.each`
+      desc                                | fn
+      ${'does not show search menu item'} | ${findSearchMenuItem}
+      ${'does not show new dropdown'}     | ${findNewDropdown}
+    `('$desc', ({ fn }) => {
+      expect(fn().exists()).toBe(false);
+    });
+
+    it('shows menu sections', () => {
+      expect(findMenuSections().props('sections')).toEqual([
+        { id: 'primary', menuItems: TEST_NAV_DATA.primary },
+        { id: 'secondary', menuItems: TEST_NAV_DATA.secondary },
+      ]);
+    });
+
+    it('emits when menu sections emits', () => {
+      expect(menuItemClickListener).not.toHaveBeenCalled();
+
+      findMenuSections().vm.$emit('menu-item-click', TEST_NAV_DATA.primary[0]);
+
+      expect(menuItemClickListener).toHaveBeenCalledWith(TEST_NAV_DATA.primary[0]);
+    });
+  });
+
+  describe('without secondary', () => {
+    beforeEach(() => {
+      createComponent({ navData: { ...TEST_NAV_DATA, secondary: null } });
+    });
+
+    it('shows menu sections', () => {
+      expect(findMenuSections().props('sections')).toEqual([
+        { id: 'primary', menuItems: TEST_NAV_DATA.primary },
+      ]);
+    });
+  });
+
+  describe('with search view', () => {
+    beforeEach(() => {
+      createComponent({
+        navData: {
+          ...TEST_NAV_DATA,
+          views: { search: TEST_SEARCH_MENU_ITEM },
+        },
+      });
+    });
+
+    it('shows search menu item', () => {
+      expect(findSearchMenuItem().props()).toEqual({
+        menuItem: TEST_SEARCH_MENU_ITEM,
+        iconOnly: true,
+      });
+    });
+
+    it('shows tooltip for search', () => {
+      const tooltip = getBinding(findSearchMenuItem().element, 'gl-tooltip');
+      expect(tooltip.value).toEqual({ title: TEST_SEARCH_MENU_ITEM.title });
+    });
+  });
+
+  describe('with new view', () => {
+    beforeEach(() => {
+      createComponent({
+        navData: {
+          ...TEST_NAV_DATA,
+          views: { new: TEST_NEW_DROPDOWN_VIEW_MODEL },
+        },
+      });
+    });
+
+    it('shows new dropdown', () => {
+      expect(findNewDropdown().props()).toEqual({
+        viewModel: TEST_NEW_DROPDOWN_VIEW_MODEL,
+      });
+    });
+
+    it('shows tooltip for new dropdown', () => {
+      const tooltip = getBinding(findNewDropdown().element, 'gl-tooltip');
+      expect(tooltip.value).toEqual({ title: TEST_NEW_DROPDOWN_VIEW_MODEL.title });
+    });
+  });
+});

spec/frontend/nav/components/top_nav_container_view_spec.js

@@ -13,6 +13,7 @@ const DEFAULT_PROPS = {
   frequentItemsVuexModule: FREQUENT_ITEMS_PROJECTS.vuexModule,
   linksPrimary: TEST_NAV_DATA.primary,
   linksSecondary: TEST_NAV_DATA.secondary,
+  containerClass: 'test-frequent-items-container-class',
 };
 const TEST_OTHER_PROPS = {
   namespace: 'projects',
@@ -44,6 +45,7 @@ describe('~/nav/components/top_nav_container_view.vue', () => {
       attributes: parent.findComponent(FrequentItemsApp).attributes(),
     };
   };
+  const findFrequentItemsContainer = () => wrapper.find('[data-testid="frequent-items-container"]');
 
   afterEach(() => {
     wrapper.destroy();
@@ -85,6 +87,10 @@ describe('~/nav/components/top_nav_container_view.vue', () => {
       });
     });
 
+    it('renders given container class', () => {
+      expect(findFrequentItemsContainer().classes(DEFAULT_PROPS.containerClass)).toBe(true);
+    });
+
     it('renders menu sections', () => {
       const sections = [
         { id: 'primary', menuItems: TEST_NAV_DATA.primary },

spec/frontend/nav/components/top_nav_menu_item_spec.js

@@ -30,7 +30,10 @@ describe('~/nav/components/top_nav_menu_item.vue', () => {
   const findButtonIcons = () =>
     findButton()
       .findAllComponents(GlIcon)
-      .wrappers.map((x) => x.props('name'));
+      .wrappers.map((x) => ({
+        name: x.props('name'),
+        classes: x.classes(),
+      }));
 
   beforeEach(() => {
     listener = jest.fn();
@@ -65,11 +68,42 @@ describe('~/nav/components/top_nav_menu_item.vue', () => {
 
       expect(listener).toHaveBeenCalledWith('TEST');
     });
+
+    it('renders expected icons', () => {
+      expect(findButtonIcons()).toEqual([
+        {
+          name: TEST_MENU_ITEM.icon,
+          classes: ['gl-mr-2!'],
+        },
+        {
+          name: 'chevron-right',
+          classes: ['gl-ml-auto'],
+        },
+      ]);
+    });
+  });
+
+  describe('with icon-only', () => {
+    beforeEach(() => {
+      createComponent({ iconOnly: true });
+    });
+
+    it('does not render title or view icon', () => {
+      expect(wrapper.text()).toBe('');
+    });
+
+    it('only renders menuItem icon', () => {
+      expect(findButtonIcons()).toEqual([
+        {
+          name: TEST_MENU_ITEM.icon,
+          classes: [],
+        },
+      ]);
+    });
   });
 
   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 }} | ${[]}
@@ -79,7 +113,7 @@ describe('~/nav/components/top_nav_menu_item.vue', () => {
     });
 
     it(`renders expected icons ${JSON.stringify(expectedIcons)}`, () => {
-      expect(findButtonIcons()).toEqual(expectedIcons);
+      expect(findButtonIcons().map((x) => x.name)).toEqual(expectedIcons);
     });
   });
 

spec/frontend/nav/components/top_nav_menu_sections_spec.js

@@ -51,11 +51,11 @@ describe('~/nav/components/top_nav_menu_sections.vue', () => {
           menuItems: [
             {
               menuItem: TEST_SECTIONS[0].menuItems[0],
-              classes: [],
+              classes: ['gl-w-full'],
             },
             ...TEST_SECTIONS[0].menuItems.slice(1).map((menuItem) => ({
               menuItem,
-              classes: ['gl-mt-1'],
+              classes: ['gl-w-full', 'gl-mt-1'],
             })),
           ],
         },
@@ -64,11 +64,11 @@ describe('~/nav/components/top_nav_menu_sections.vue', () => {
           menuItems: [
             {
               menuItem: TEST_SECTIONS[1].menuItems[0],
-              classes: [],
+              classes: ['gl-w-full'],
             },
             ...TEST_SECTIONS[1].menuItems.slice(1).map((menuItem) => ({
               menuItem,
-              classes: ['gl-mt-1'],
+              classes: ['gl-w-full', 'gl-mt-1'],
             })),
           ],
         },

spec/frontend/nav/components/top_nav_new_dropdown_spec.js

+import { GlDropdown } from '@gitlab/ui';
+import { shallowMount } from '@vue/test-utils';
+import TopNavNewDropdown from '~/nav/components/top_nav_new_dropdown.vue';
+
+const TEST_VIEW_MODEL = {
+  title: 'Dropdown',
+  menu_sections: [
+    {
+      title: 'Section 1',
+      menu_items: [
+        { id: 'foo-1', title: 'Foo 1', href: '/foo/1' },
+        { id: 'foo-2', title: 'Foo 2', href: '/foo/2' },
+        { id: 'foo-3', title: 'Foo 3', href: '/foo/3' },
+      ],
+    },
+    {
+      title: 'Section 2',
+      menu_items: [
+        { id: 'bar-1', title: 'Bar 1', href: '/bar/1' },
+        { id: 'bar-2', title: 'Bar 2', href: '/bar/2' },
+      ],
+    },
+  ],
+};
+
+describe('~/nav/components/top_nav_menu_sections.vue', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = shallowMount(TopNavNewDropdown, {
+      propsData: {
+        viewModel: TEST_VIEW_MODEL,
+        ...props,
+      },
+    });
+  };
+
+  const findDropdown = () => wrapper.findComponent(GlDropdown);
+  const findDropdownContents = () =>
+    findDropdown()
+      .findAll('[data-testid]')
+      .wrappers.map((child) => {
+        const type = child.attributes('data-testid');
+
+        if (type === 'divider') {
+          return { type };
+        } else if (type === 'header') {
+          return { type, text: child.text() };
+        }
+
+        return {
+          type,
+          text: child.text(),
+          href: child.attributes('href'),
+        };
+      });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('default', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders dropdown parent', () => {
+      expect(findDropdown().props()).toMatchObject({
+        text: TEST_VIEW_MODEL.title,
+        textSrOnly: true,
+        icon: 'plus',
+      });
+    });
+
+    it('renders dropdown content', () => {
+      expect(findDropdownContents()).toEqual([
+        {
+          type: 'header',
+          text: TEST_VIEW_MODEL.menu_sections[0].title,
+        },
+        ...TEST_VIEW_MODEL.menu_sections[0].menu_items.map(({ title, href }) => ({
+          type: 'item',
+          href,
+          text: title,
+        })),
+        {
+          type: 'divider',
+        },
+        {
+          type: 'header',
+          text: TEST_VIEW_MODEL.menu_sections[1].title,
+        },
+        ...TEST_VIEW_MODEL.menu_sections[1].menu_items.map(({ title, href }) => ({
+          type: 'item',
+          href,
+          text: title,
+        })),
+      ]);
+    });
+  });
+
+  describe('with only 1 section', () => {
+    beforeEach(() => {
+      createComponent({
+        viewModel: {
+          ...TEST_VIEW_MODEL,
+          menu_sections: TEST_VIEW_MODEL.menu_sections.slice(0, 1),
+        },
+      });
+    });
+
+    it('renders dropdown content without headers and dividers', () => {
+      expect(findDropdownContents()).toEqual(
+        TEST_VIEW_MODEL.menu_sections[0].menu_items.map(({ title, href }) => ({
+          type: 'item',
+          href,
+          text: title,
+        })),
+      );
+    });
+  });
+});

spec/frontend/nav/mock_data.js

@@ -25,11 +25,15 @@ export const TEST_NAV_DATA = {
       namespace: 'projects',
       currentUserName: '',
       currentItem: {},
+      linksPrimary: [{ id: 'project-link', href: '/path/to/projects', title: 'Project Link' }],
+      linksSecondary: [],
     },
     groups: {
       namespace: 'groups',
       currentUserName: '',
       currentItem: {},
+      linksPrimary: [],
+      linksSecondary: [{ id: 'group-link', href: '/path/to/groups', title: 'Group Link' }],
     },
   },
 };

spec/helpers/nav/top_nav_helper_spec.rb

@@ -5,11 +5,16 @@ require 'spec_helper'
 RSpec.describe Nav::TopNavHelper do
   include ActionView::Helpers::UrlHelper
 
-  describe '#top_nav_view_model' do
-    let_it_be(:user) { build_stubbed(:user) }
-    let_it_be(:admin) { build_stubbed(:user, :admin) }
+  let_it_be(:user) { build_stubbed(:user) }
+  let_it_be(:admin) { build_stubbed(:user, :admin) }
+
+  let(:current_user) { nil }
+
+  before do
+    allow(helper).to receive(:current_user) { current_user }
+  end
 
-    let(:current_user) { nil }
+  describe '#top_nav_view_model' do
     let(:current_project) { nil }
     let(:current_group) { nil }
     let(:with_current_settings_admin_mode) { false }
@@ -26,7 +31,6 @@ RSpec.describe Nav::TopNavHelper do
     let(:active_title) { 'Menu' }
 
     before do
-      allow(helper).to receive(:current_user) { current_user }
       allow(Gitlab::CurrentSettings).to receive(:admin_mode) { with_current_settings_admin_mode }
       allow(helper).to receive(:header_link?).with(:admin_mode) { with_header_link_admin_mode }
       allow(Gitlab::Sherlock).to receive(:enabled?) { with_sherlock_enabled }
@@ -487,4 +491,50 @@ RSpec.describe Nav::TopNavHelper do
       end
     end
   end
+
+  describe '#top_nav_responsive_view_model' do
+    let_it_be(:project) { create(:project) }
+    let_it_be(:group) { create(:group) }
+
+    let(:with_search) { false }
+    let(:with_new_view_model) { nil }
+
+    let(:subject) { helper.top_nav_responsive_view_model(project: project, group: group) }
+
+    before do
+      allow(helper).to receive(:header_link?).with(:search) { with_search }
+      allow(helper).to receive(:new_dropdown_view_model).with(project: project, group: group) { with_new_view_model }
+    end
+
+    it 'has nil new subview' do
+      expect(subject[:views][:new]).to be_nil
+    end
+
+    it 'has nil search subview' do
+      expect(subject[:views][:search]).to be_nil
+    end
+
+    context 'with search' do
+      let(:with_search) { true }
+
+      it 'has search subview' do
+        expect(subject[:views][:search]).to eq(
+          ::Gitlab::Nav::TopNavMenuItem.build(
+            id: 'search',
+            title: 'Search',
+            icon: 'search',
+            href: search_path
+          )
+        )
+      end
+    end
+
+    context 'with new' do
+      let(:with_new_view_model) { { id: 'test-new-view-model' } }
+
+      it 'has new subview' do
+        expect(subject[:views][:new]).to eq({ id: 'test-new-view-model' })
+      end
+    end
+  end
 end