Add `MembersTabs` Vue component

Will be used to migrate group/project members tabs from Bootstrap to
GitLab UI `GlTabs`

app/assets/javascripts/members/components/members_tabs.vue

+<script>
+import { GlTabs, GlTab, GlBadge } from '@gitlab/ui';
+import { mapState } from 'vuex';
+import { urlParamsToObject } from '~/lib/utils/common_utils';
+import { __ } from '~/locale';
+import { MEMBER_TYPES } from '../constants';
+import MembersApp from './app.vue';
+
+const countComputed = (state, namespace) => state[namespace]?.pagination?.totalItems || 0;
+
+export default {
+  name: 'MembersTabs',
+  tabs: [
+    {
+      namespace: MEMBER_TYPES.user,
+      title: __('Members'),
+    },
+    {
+      namespace: MEMBER_TYPES.group,
+      title: __('Groups'),
+      attrs: { 'data-qa-selector': 'groups_list_tab' },
+    },
+    {
+      namespace: MEMBER_TYPES.invite,
+      title: __('Invited'),
+      canManageMembersPermissionsRequired: true,
+    },
+    {
+      namespace: MEMBER_TYPES.accessRequest,
+      title: __('Access requests'),
+      canManageMembersPermissionsRequired: true,
+    },
+  ],
+  urlParams: [],
+  components: { MembersApp, GlTabs, GlTab, GlBadge },
+  inject: ['canManageMembers'],
+  data() {
+    return {
+      selectedTabIndex: 0,
+    };
+  },
+  computed: {
+    ...mapState({
+      userCount(state) {
+        return countComputed(state, MEMBER_TYPES.user);
+      },
+      groupCount(state) {
+        return countComputed(state, MEMBER_TYPES.group);
+      },
+      inviteCount(state) {
+        return countComputed(state, MEMBER_TYPES.invite);
+      },
+      accessRequestCount(state) {
+        return countComputed(state, MEMBER_TYPES.accessRequest);
+      },
+    }),
+    urlParams() {
+      return Object.keys(urlParamsToObject(window.location.search));
+    },
+    activeTabIndexCalculatedFromUrlParams() {
+      return this.$options.tabs.findIndex(({ namespace }) => {
+        return this.getTabUrlParams(namespace).some((urlParam) =>
+          this.urlParams.includes(urlParam),
+        );
+      });
+    },
+  },
+  created() {
+    if (this.activeTabIndexCalculatedFromUrlParams === -1) {
+      return;
+    }
+
+    this.selectedTabIndex = this.activeTabIndexCalculatedFromUrlParams;
+  },
+  methods: {
+    getTabUrlParams(namespace) {
+      const state = this.$store.state[namespace];
+      const urlParams = [];
+
+      if (state?.pagination?.paramName) {
+        urlParams.push(state.pagination.paramName);
+      }
+
+      if (state?.filteredSearchBar?.searchParam) {
+        urlParams.push(state.filteredSearchBar.searchParam);
+      }
+
+      return urlParams;
+    },
+    getTabCount({ namespace }) {
+      return this[`${namespace}Count`];
+    },
+    showTab(tab, index) {
+      if (tab.namespace === MEMBER_TYPES.user) {
+        return true;
+      }
+
+      const { canManageMembersPermissionsRequired = false } = tab;
+      const tabCanBeShown =
+        this.getTabCount(tab) > 0 || this.activeTabIndexCalculatedFromUrlParams === index;
+
+      if (canManageMembersPermissionsRequired) {
+        return this.canManageMembers && tabCanBeShown;
+      }
+
+      return tabCanBeShown;
+    },
+  },
+};
+</script>
+
+<template>
+  <gl-tabs v-model="selectedTabIndex">
+    <template v-for="(tab, index) in $options.tabs">
+      <gl-tab v-if="showTab(tab, index)" :key="tab.namespace" :title-link-attributes="tab.attrs">
+        <template slot="title">
+          <span>{{ tab.title }}</span>
+          <gl-badge size="sm" class="gl-tab-counter-badge">{{ getTabCount(tab) }}</gl-badge>
+        </template>
+        <members-app :namespace="tab.namespace" />
+      </gl-tab>
+    </template>
+  </gl-tabs>
+</template>

spec/frontend/members/components/members_tabs_spec.js

+import Vue, { nextTick } from 'vue';
+import Vuex from 'vuex';
+import { mountExtended } from 'helpers/vue_test_utils_helper';
+import MembersApp from '~/members/components/app.vue';
+import MembersTabs from '~/members/components/members_tabs.vue';
+import { MEMBER_TYPES } from '~/members/constants';
+import { pagination } from '../mock_data';
+
+describe('MembersApp', () => {
+  Vue.use(Vuex);
+
+  let wrapper;
+
+  const createComponent = ({ totalItems = 10, options = {} } = {}) => {
+    const store = new Vuex.Store({
+      modules: {
+        [MEMBER_TYPES.user]: {
+          namespaced: true,
+          state: {
+            pagination: {
+              ...pagination,
+              totalItems,
+            },
+            filteredSearchBar: {
+              searchParam: 'search',
+            },
+          },
+        },
+        [MEMBER_TYPES.group]: {
+          namespaced: true,
+          state: {
+            pagination: {
+              ...pagination,
+              totalItems,
+              paramName: 'groups_page',
+            },
+            filteredSearchBar: {
+              searchParam: 'search_groups',
+            },
+          },
+        },
+        [MEMBER_TYPES.invite]: {
+          namespaced: true,
+          state: {
+            pagination: {
+              ...pagination,
+              totalItems,
+              paramName: 'invited_page',
+            },
+            filteredSearchBar: {
+              searchParam: 'search_invited',
+            },
+          },
+        },
+        [MEMBER_TYPES.accessRequest]: {
+          namespaced: true,
+          state: {
+            pagination: {
+              ...pagination,
+              totalItems,
+              paramName: 'access_requests_page',
+            },
+            filteredSearchBar: {
+              searchParam: 'search_access_requests',
+            },
+          },
+        },
+      },
+    });
+
+    wrapper = mountExtended(MembersTabs, {
+      store,
+      stubs: ['members-app'],
+      provide: {
+        canManageMembers: true,
+      },
+      ...options,
+    });
+
+    return nextTick();
+  };
+
+  const findTabs = () => wrapper.findAllByRole('tab').wrappers;
+  const findTabByText = (text) => findTabs().find((tab) => tab.text().includes(text));
+  const findActiveTab = () => wrapper.findByRole('tab', { selected: true });
+
+  beforeEach(() => {
+    delete window.location;
+    window.location = new URL('https://localhost');
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when tabs have a count', () => {
+    it('renders tabs with count', async () => {
+      await createComponent();
+
+      const tabs = findTabs();
+
+      expect(tabs[0].text()).toBe('Members  10');
+      expect(tabs[1].text()).toBe('Groups  10');
+      expect(tabs[2].text()).toBe('Invited  10');
+      expect(tabs[3].text()).toBe('Access requests  10');
+      expect(findActiveTab().text()).toContain('Members');
+    });
+
+    it('renders `MembersApp` and passes `namespace` prop', async () => {
+      await createComponent();
+
+      const membersApps = wrapper.findAllComponents(MembersApp).wrappers;
+
+      expect(membersApps[0].attributes('namespace')).toBe(MEMBER_TYPES.user);
+      expect(membersApps[1].attributes('namespace')).toBe(MEMBER_TYPES.group);
+      expect(membersApps[2].attributes('namespace')).toBe(MEMBER_TYPES.invite);
+      expect(membersApps[3].attributes('namespace')).toBe(MEMBER_TYPES.accessRequest);
+    });
+  });
+
+  describe('when tabs do not have a count', () => {
+    it('only renders `Members` tab', async () => {
+      await createComponent({ totalItems: 0 });
+
+      expect(findTabByText('Members')).not.toBeUndefined();
+      expect(findTabByText('Groups')).toBeUndefined();
+      expect(findTabByText('Invited')).toBeUndefined();
+      expect(findTabByText('Access requests')).toBeUndefined();
+    });
+  });
+
+  describe('when url param matches `filteredSearchBar.searchParam`', () => {
+    beforeEach(() => {
+      window.location.search = '?search_groups=foo+bar';
+    });
+
+    const expectGroupsTabActive = () => {
+      expect(findActiveTab().text()).toContain('Groups');
+    };
+
+    describe('when tab has a count', () => {
+      it('sets tab that corresponds to search param as active tab', async () => {
+        await createComponent();
+
+        expectGroupsTabActive();
+      });
+    });
+
+    describe('when tab does not have a count', () => {
+      it('sets tab that corresponds to search param as active tab', async () => {
+        await createComponent({ totalItems: 0 });
+
+        expectGroupsTabActive();
+      });
+    });
+  });
+
+  describe('when url param matches `pagination.paramName`', () => {
+    beforeEach(() => {
+      window.location.search = '?invited_page=2';
+    });
+
+    const expectInvitedTabActive = () => {
+      expect(findActiveTab().text()).toContain('Invited');
+    };
+
+    describe('when tab has a count', () => {
+      it('sets tab that corresponds to pagination param as active tab', async () => {
+        await createComponent();
+
+        expectInvitedTabActive();
+      });
+    });
+
+    describe('when tab does not have a count', () => {
+      it('sets tab that corresponds to pagination param as active tab', async () => {
+        await createComponent({ totalItems: 0 });
+
+        expectInvitedTabActive();
+      });
+    });
+  });
+
+  describe('when `canManageMembers` is `false`', () => {
+    it('shows all tabs except `Invited` and `Access requests`', async () => {
+      await createComponent({ options: { provide: { canManageMembers: false } } });
+
+      expect(findTabByText('Members')).not.toBeUndefined();
+      expect(findTabByText('Groups')).not.toBeUndefined();
+      expect(findTabByText('Invited')).toBeUndefined();
+      expect(findTabByText('Access requests')).toBeUndefined();
+    });
+  });
+});