Update tests

Author: ryanmccartney

src/playbackstrategy/msestrategy.js

@@ -430,8 +430,10 @@ function MSEStrategy(
 
       if (dashMetrics) {
         const dvrInfo = dashMetrics.getCurrentDVRInfo(event.mediaType)
+        if (dvrInfo && dvrInfo.time) {
+          playerMetadata.latency = dvrInfo.range.end - dvrInfo.time
+        }
         playerMetadata.bufferLength = dashMetrics.getCurrentBufferLevel(event.mediaType)
-        playerMetadata.latency = dvrInfo.range.end - dvrInfo.time
         DebugTool.staticMetric("buffer-length", playerMetadata.bufferLength)
         Plugins.interface.onPlayerInfoUpdated({
           bufferLength: playerMetadata.bufferLength,

src/playbackstrategy/msestrategy.test.js

@@ -537,6 +537,7 @@ describe("Media Source Extensions Playback Strategy", () => {
 
       expect(Plugins.interface.onPlayerInfoUpdated).toHaveBeenCalledWith({
         playbackBitrate: undefined,
+        latency: undefined,
         bufferLength: 15,
       })
     })