From db4fbd51595be8c91907a153d77ea0c6f0ec788f Mon Sep 17 00:00:00 2001
From: Eoghan Murray <eoghan@getthere.ie>
Date: Fri, 14 May 2021 16:43:22 +0100
Subject: [PATCH] Add a test for the idea that emissions should be weakly
 ascending over the timestamp attribute

---
 packages/rrweb/test/utils.ts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/packages/rrweb/test/utils.ts b/packages/rrweb/test/utils.ts
index 6a2ac5811b..3c80da6861 100644
--- a/packages/rrweb/test/utils.ts
+++ b/packages/rrweb/test/utils.ts
@@ -46,6 +46,7 @@ export function matchSnapshot(
  * @param snapshots incrementalSnapshotEvent[]
  */
 function stringifySnapshots(snapshots: eventWithTime[]): string {
+  let asc_time = 0;
   return JSON.stringify(
     snapshots
       .filter((s) => {
@@ -110,6 +111,21 @@ function stringifySnapshots(snapshots: eventWithTime[]): string {
             coordinatesReg.lastIndex = 0; // wow, a real wart in ECMAScript
           });
         }
+        if (
+          s.type === EventType.IncrementalSnapshot &&
+            (s.data.source === IncrementalSource.MouseMove
+             || s.data.source === IncrementalSource.TouchMove
+             || s.data.source === IncrementalSource.Drag)
+        ) {
+          s.data.positions.forEach((p) => {
+            let t = s.timestamp + p.timeOffset;
+            assert(asc_time <= t);
+            asc_time = t;
+          });
+        } else {
+          assert(asc_time <= s.timestamp);
+          asc_time = s.timestamp;
+        }
         delete s.timestamp;
         return s;
       }),