1 files changed, 19 insertions, 6 deletions
diff --git a/spec/javascripts/datetime_utility_spec.js b/spec/javascripts/datetime_utility_spec.js
index 492171684dc..6c3e73f134e 100644
--- a/spec/javascripts/datetime_utility_spec.js
+++ b/spec/javascripts/datetime_utility_spec.js
@@ -6,9 +6,7 @@ describe('Date time utils', () => {
       const date = new Date();
       date.setFullYear(date.getFullYear() - 1);
 
-      expect(
-        datetimeUtility.timeFor(date),
-      ).toBe('Past due');
+      expect(datetimeUtility.timeFor(date)).toBe('Past due');
     });
 
     it('returns remaining time when in the future', () => {
@@ -19,9 +17,7 @@ describe('Date time utils', () => {
       // short of a full year, timeFor will return '11 months remaining'
       date.setDate(date.getDate() + 1);
 
-      expect(
-        datetimeUtility.timeFor(date),
-      ).toBe('1 year remaining');
+      expect(datetimeUtility.timeFor(date)).toBe('1 year remaining');
     });
   });
 
@@ -168,3 +164,20 @@ describe('getTimeframeWindowFrom', () => {
     });
   });
 });
+
+describe('formatTime', () => {
+  const expectedTimestamps = [
+    [0, '00:00:00'],
+    [1000, '00:00:01'],
+    [42000, '00:00:42'],
+    [121000, '00:02:01'],
+    [10921000, '03:02:01'],
+    [108000000, '30:00:00'],
+  ];
+
+  expectedTimestamps.forEach(([milliseconds, expectedTimestamp]) => {
+    it(`formats ${milliseconds}ms as ${expectedTimestamp}`, () => {
+      expect(datetimeUtility.formatTime(milliseconds)).toBe(expectedTimestamp);
+    });
+  });
+});