fixup! Move mutation tests into their own files to demonstrate an idea which could be applied across all snapshots. Also, only mutation events are relevant here (reduce burden when manually expecting test output). Also (commented out) showing how to reuse expected output between tests, i.e. assert that two tests produce same output

Author: eoghanmurray

packages/rrweb/test/record/mutation.test.ts

@@ -223,7 +223,9 @@ describe('mutation', () => {
       d1.append(siblingDiv);
     });
     await waitForRAF(page);
-    const mutations = events.filter((e)=>e.type === EventType.IncrementalSnapshot);
+    const mutations = events.filter(
+      (e) => e.type === EventType.IncrementalSnapshot,
+    );
     await assertSnapshot(mutations, true);
   });
 
@@ -242,7 +244,9 @@ describe('mutation', () => {
       d1.append(siblingDiv2);
     });
     await waitForRAF(page);
-    const mutations = events.filter((e)=>e.type === EventType.IncrementalSnapshot);
+    const mutations = events.filter(
+      (e) => e.type === EventType.IncrementalSnapshot,
+    );
     await assertSnapshot(mutations, true);
   });
 
@@ -259,7 +263,9 @@ describe('mutation', () => {
       d1.append(b1);
     });
     await waitForRAF(page);
-    const mutations = events.filter((e)=>e.type === EventType.IncrementalSnapshot);
+    const mutations = events.filter(
+      (e) => e.type === EventType.IncrementalSnapshot,
+    );
     await assertSnapshot(mutations, true);
   });