Add param update to vue issuables list

app/assets/javascripts/issuables_list/components/issuables_list_app.vue

 <script>
-import { omit } from 'lodash';
+import { toNumber, omit } from 'lodash';
 import { GlEmptyState, GlPagination, GlSkeletonLoading } from '@gitlab/ui';
 import flash from '~/flash';
 import axios from '~/lib/utils/axios_utils';
-import { scrollToElement, urlParamsToObject } from '~/lib/utils/common_utils';
+import {
+  scrollToElement,
+  urlParamsToObject,
+  historyPushState,
+  getParameterByName,
+} from '~/lib/utils/common_utils';
 import { __ } from '~/locale';
 import initManualOrdering from '~/manual_ordering';
 import Issuable from './issuable.vue';
@@ -14,6 +19,7 @@ import {
   PAGE_SIZE_MANUAL,
   LOADING_LIST_ITEMS_LENGTH,
 } from '../constants';
+import { setUrlParams } from '~/lib/utils/url_utility';
 import issueableEventHub from '../eventhub';
 
 export default {
@@ -56,7 +62,10 @@ export default {
       isBulkEditing: false,
       issuables: [],
       loading: false,
-      page: 1,
+      page:
+        getParameterByName('page', window.location.href) !== null
+          ? toNumber(getParameterByName('page'))
+          : 1,
       selection: {},
       totalItems: 0,
     };
@@ -189,6 +198,12 @@ export default {
       if (newPage === this.page) return;
 
       scrollToElement('#content-body');
+
+      // NOTE: This allows for the params to be updated on pagination
+      historyPushState(
+        setUrlParams({ ...this.filters, page: newPage }, window.location.href, true),
+      );
+
       this.fetchIssuables(newPage);
     },
     onSelectAll() {

spec/frontend/issuables_list/components/issuables_list_app_spec.js

@@ -12,12 +12,21 @@ import { PAGE_SIZE, PAGE_SIZE_MANUAL, RELATIVE_POSITION } from '~/issuables_list
 
 jest.mock('~/flash', () => jest.fn());
 jest.mock('~/issuables_list/eventhub');
+jest.mock('~/lib/utils/common_utils', () => ({
+  ...jest.requireActual('~/lib/utils/common_utils'),
+  scrollToElement: () => {},
+}));
 
 const TEST_LOCATION = `${TEST_HOST}/issues`;
 const TEST_ENDPOINT = '/issues';
 const TEST_CREATE_ISSUES_PATH = '/createIssue';
 const TEST_EMPTY_SVG_PATH = '/emptySvg';
 
+const setUrl = query => {
+  window.location.href = `${TEST_LOCATION}${query}`;
+  window.location.search = query;
+};
+
 const MOCK_ISSUES = Array(PAGE_SIZE_MANUAL)
   .fill(0)
   .map((_, i) => ({
@@ -267,8 +276,6 @@ describe('Issuables list component', () => {
   });
 
   describe('with query params in window.location', () => {
-    const query =
-      '?assignee_username=root&author_username=root&confidential=yes&label_name%5B%5D=Aquapod&label_name%5B%5D=Astro&milestone_title=v3.0&my_reaction_emoji=airplane&scope=all&sort=priority&state=opened&utf8=%E2%9C%93&weight=0';
     const expectedFilters = {
       assignee_username: 'root',
       author_username: 'root',
@@ -284,14 +291,23 @@ describe('Issuables list component', () => {
       sort: 'desc',
     };
 
+    describe('when page is not present in params', () => {
+      const query =
+        '?assignee_username=root&author_username=root&confidential=yes&label_name%5B%5D=Aquapod&label_name%5B%5D=Astro&milestone_title=v3.0&my_reaction_emoji=airplane&scope=all&sort=priority&state=opened&utf8=%E2%9C%93&weight=0';
+
       beforeEach(() => {
-      window.location.href = `${TEST_LOCATION}${query}`;
-      window.location.search = query;
+        setUrl(query);
+
         setupApiMock(() => [200, MOCK_ISSUES.slice(0)]);
         factory({ sortKey: 'milestone_due_desc' });
+
         return waitForPromises();
       });
 
+      afterEach(() => {
+        apiSpy.mockClear();
+      });
+
       it('applies filters and sorts', () => {
         expect(wrapper.vm.hasFilters).toBe(true);
         expect(wrapper.vm.filters).toEqual(expectedFilters);
@@ -309,7 +325,39 @@ describe('Issuables list component', () => {
       });
 
       it('passes the base url to issuable', () => {
-      expect(findFirstIssuable().props('baseUrl')).toEqual(TEST_LOCATION);
+        expect(findFirstIssuable().props('baseUrl')).toBe(TEST_LOCATION);
+      });
+    });
+
+    describe('when page is present in the param', () => {
+      const query =
+        '?assignee_username=root&author_username=root&confidential=yes&label_name%5B%5D=Aquapod&label_name%5B%5D=Astro&milestone_title=v3.0&my_reaction_emoji=airplane&scope=all&sort=priority&state=opened&utf8=%E2%9C%93&weight=0&page=3';
+
+      beforeEach(() => {
+        setUrl(query);
+
+        setupApiMock(() => [200, MOCK_ISSUES.slice(0)]);
+        factory({ sortKey: 'milestone_due_desc' });
+
+        return waitForPromises();
+      });
+
+      afterEach(() => {
+        apiSpy.mockClear();
+      });
+
+      it('applies filters and sorts', () => {
+        expect(apiSpy).toHaveBeenCalledWith(
+          expect.objectContaining({
+            params: {
+              ...expectedFilters,
+              with_labels_details: true,
+              page: 3,
+              per_page: PAGE_SIZE,
+            },
+          }),
+        );
+      });
     });
   });
 
@@ -322,7 +370,7 @@ describe('Issuables list component', () => {
     });
 
     it('passes the base url to issuable', () => {
-      expect(findFirstIssuable().props('baseUrl')).toEqual(TEST_LOCATION);
+      expect(findFirstIssuable().props('baseUrl')).toBe(TEST_LOCATION);
     });
   });
 
@@ -402,4 +450,47 @@ describe('Issuables list component', () => {
       });
     });
   });
+
+  describe('when paginates', () => {
+    const newPage = 3;
+
+    beforeEach(() => {
+      window.history.pushState = jest.fn();
+      setupApiMock(() => [
+        200,
+        MOCK_ISSUES.slice(0, PAGE_SIZE),
+        {
+          'x-total': 100,
+          'x-page': 2,
+        },
+      ]);
+
+      factory();
+
+      return waitForPromises();
+    });
+
+    afterEach(() => {
+      // reset to original value
+      window.history.pushState.mockRestore();
+    });
+
+    it('calls window.history.pushState one time', () => {
+      // Trigger pagination
+      wrapper.find(GlPagination).vm.$emit('input', newPage);
+
+      expect(window.history.pushState).toHaveBeenCalledTimes(1);
+    });
+
+    it('sets params in the url', () => {
+      // Trigger pagination
+      wrapper.find(GlPagination).vm.$emit('input', newPage);
+
+      expect(window.history.pushState).toHaveBeenCalledWith(
+        {},
+        '',
+        `${TEST_LOCATION}?state=opened&order_by=priority&sort=asc&page=${newPage}`,
+      );
+    });
+  });
 });