1 files changed, 56 insertions, 0 deletions
diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_trackless_sender_stats.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_trackless_sender_stats.html
new file mode 100644
index 0000000000..f0356f5655
--- /dev/null
+++ b/dom/media/webrtc/tests/mochitests/test_peerConnection_trackless_sender_stats.html
@@ -0,0 +1,56 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+  <script type="application/javascript" src="stats.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "1452673",
+    title: "Trackless RTCRtpSender.getStats()",
+    visible: true
+  });
+
+  // Calling getstats() on a trackless RTCRtpSender should yield an empty
+  // stats report.  When track stats are added in the future, the stats
+  // for the removed tracks should continue to appear.
+
+  runNetworkTest(function (options) {
+    const test = new PeerConnectionTest(options);
+    test.chain.removeAfter("PC_REMOTE_WAIT_FOR_MEDIA_FLOW");
+    test.chain.append(
+      async function PC_LOCAL_AND_REMOTE_TRACKLESS_SENDER_STATS(test) {
+        await Promise.all([
+          waitForSyncedRtcp(test.pcLocal._pc),
+          waitForSyncedRtcp(test.pcRemote._pc),
+        ]);
+        let senders = test.pcLocal.getSenders();
+        let receivers = test.pcRemote.getReceivers();
+        is(senders.length, 2, "Have exactly two senders.");
+        is(receivers.length, 2, "Have exactly two receivers.");
+        for(let kind of ["audio", "video"]) {
+          is(senders.filter(s => s.track.kind == kind).length, 1,
+              "Exactly 1 sender of kind " + kind);
+          is(receivers.filter(r => r.track.kind == kind).length, 1,
+              "Exactly 1 receiver of kind " + kind);
+        }
+        // Remove tracks from senders
+        for (const sender of senders) {
+          await sender.replaceTrack(null);
+          is(sender.track, null, "Sender track removed");
+          let stats = await sender.getStats();
+          ok(stats instanceof window.RTCStatsReport, "Stats is instance of RTCStatsReport");
+          // Number of stats in the report. This should be 0.
+          is(stats.size, 0, "Trackless sender stats report is empty");
+        }
+      }
+    );
+    test.setMediaConstraints([{audio: true}, {video: true}], []);
+    return test.run();
+  });
+</script>
+</pre>
+</body>
+</html>