Fix test and add tests.

libraries/mediaviewer/test/src/main/kotlin/io/element/android/libraries/mediaviewer/test/FakeLocalMediaFactory.kt

@@ -42,6 +42,7 @@ class FakeLocalMediaFactory(
             senderAvatar = null,
             dateSent = null,
             dateSentFull = null,
+            waveform = null,
         )
         return aLocalMedia(uri, mediaInfo)
     }