1 files changed, 36 insertions, 1 deletions
diff --git a/spec/frontend/lib/utils/datetime/date_calculation_utility_spec.js b/spec/frontend/lib/utils/datetime/date_calculation_utility_spec.js
index 59b3b4c02df..055d57d6ada 100644
--- a/spec/frontend/lib/utils/datetime/date_calculation_utility_spec.js
+++ b/spec/frontend/lib/utils/datetime/date_calculation_utility_spec.js
@@ -1,4 +1,9 @@
-import { getDateWithUTC, newDateAsLocaleTime } from '~/lib/utils/datetime/date_calculation_utility';
+import {
+  getDateWithUTC,
+  newDateAsLocaleTime,
+  nSecondsAfter,
+  nSecondsBefore,
+} from '~/lib/utils/datetime/date_calculation_utility';
 
 describe('newDateAsLocaleTime', () => {
   it.each`
@@ -31,3 +36,33 @@ describe('getDateWithUTC', () => {
     expect(getDateWithUTC(date)).toEqual(expected);
   });
 });
+
+describe('nSecondsAfter', () => {
+  const start = new Date('2022-03-22T01:23:45.678Z');
+  it.each`
+    date     | seconds  | expected
+    ${start} | ${0}     | ${start}
+    ${start} | ${1}     | ${new Date('2022-03-22T01:23:46.678Z')}
+    ${start} | ${5}     | ${new Date('2022-03-22T01:23:50.678Z')}
+    ${start} | ${60}    | ${new Date('2022-03-22T01:24:45.678Z')}
+    ${start} | ${3600}  | ${new Date('2022-03-22T02:23:45.678Z')}
+    ${start} | ${86400} | ${new Date('2022-03-23T01:23:45.678Z')}
+  `('returns $expected given $string', ({ date, seconds, expected }) => {
+    expect(nSecondsAfter(date, seconds)).toEqual(expected);
+  });
+});
+
+describe('nSecondsBefore', () => {
+  const start = new Date('2022-03-22T01:23:45.678Z');
+  it.each`
+    date     | seconds  | expected
+    ${start} | ${0}     | ${start}
+    ${start} | ${1}     | ${new Date('2022-03-22T01:23:44.678Z')}
+    ${start} | ${5}     | ${new Date('2022-03-22T01:23:40.678Z')}
+    ${start} | ${60}    | ${new Date('2022-03-22T01:22:45.678Z')}
+    ${start} | ${3600}  | ${new Date('2022-03-22T00:23:45.678Z')}
+    ${start} | ${86400} | ${new Date('2022-03-21T01:23:45.678Z')}
+  `('returns $expected given $string', ({ date, seconds, expected }) => {
+    expect(nSecondsBefore(date, seconds)).toEqual(expected);
+  });
+});