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diff --git a/spec/frontend/lib/utils/datetime/timeago_utility_spec.js b/spec/frontend/lib/utils/datetime/timeago_utility_spec.js
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+++ b/spec/frontend/lib/utils/datetime/timeago_utility_spec.js
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+import { getTimeago, localTimeAgo, timeFor } from '~/lib/utils/datetime/timeago_utility';
+import { s__ } from '~/locale';
+import '~/commons/bootstrap';
+
+describe('TimeAgo utils', () => {
+  let oldGon;
+
+  afterEach(() => {
+    window.gon = oldGon;
+  });
+
+  beforeEach(() => {
+    oldGon = window.gon;
+  });
+
+  describe('getTimeago', () => {
+    describe('with User Setting timeDisplayRelative: true', () => {
+      beforeEach(() => {
+        window.gon = { time_display_relative: true };
+      });
+
+      it.each([
+        [new Date().toISOString(), 'just now'],
+        [new Date().getTime(), 'just now'],
+        [new Date(), 'just now'],
+        [null, 'just now'],
+      ])('formats date `%p` as `%p`', (date, result) => {
+        expect(getTimeago().format(date)).toEqual(result);
+      });
+    });
+
+    describe('with User Setting timeDisplayRelative: false', () => {
+      beforeEach(() => {
+        window.gon = { time_display_relative: false };
+      });
+
+      it.each([
+        [new Date().toISOString(), 'Jul 6, 2020, 12:00 AM'],
+        [new Date(), 'Jul 6, 2020, 12:00 AM'],
+        [new Date().getTime(), 'Jul 6, 2020, 12:00 AM'],
+        // Slightly different behaviour when `null` is passed :see_no_evil`
+        [null, 'Jan 1, 1970, 12:00 AM'],
+      ])('formats date `%p` as `%p`', (date, result) => {
+        expect(getTimeago().format(date)).toEqual(result);
+      });
+    });
+  });
+
+  describe('timeFor', () => {
+    it('returns localize `past due` when in past', () => {
+      const date = new Date();
+      date.setFullYear(date.getFullYear() - 1);
+
+      expect(timeFor(date)).toBe(s__('Timeago|Past due'));
+    });
+
+    it('returns localized remaining time when in the future', () => {
+      const date = new Date();
+      date.setFullYear(date.getFullYear() + 1);
+
+      // Add a day to prevent a transient error. If date is even 1 second
+      // short of a full year, timeFor will return '11 months remaining'
+      date.setDate(date.getDate() + 1);
+
+      expect(timeFor(date)).toBe(s__('Timeago|1 year remaining'));
+    });
+  });
+
+  describe('localTimeAgo', () => {
+    beforeEach(() => {
+      document.body.innerHTML =
+        '<time title="some time" datetime="2020-02-18T22:22:32Z">1 hour ago</time>';
+    });
+
+    describe.each`
+      timeDisplayRelative | text
+      ${true}             | ${'4 months ago'}
+      ${false}            | ${'Feb 18, 2020, 10:22 PM'}
+    `(
+      `With User Setting timeDisplayRelative: $timeDisplayRelative`,
+      ({ timeDisplayRelative, text }) => {
+        it.each`
+          updateTooltip | title
+          ${false}      | ${'some time'}
+          ${true}       | ${'Feb 18, 2020 10:22pm UTC'}
+        `(
+          `has content: '${text}' and tooltip: '$title' with updateTooltip = $updateTooltip`,
+          ({ updateTooltip, title }) => {
+            window.gon = { time_display_relative: timeDisplayRelative };
+
+            const element = document.querySelector('time');
+            localTimeAgo([element], updateTooltip);
+
+            jest.runAllTimers();
+
+            expect(element.getAttribute('title')).toBe(title);
+            expect(element.innerText).toBe(text);
+          },
+        );
+      },
+    );
+  });
+});