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+++ b/dom/media/test/test_mediarecorder_record_timeslice.html
@@ -0,0 +1,105 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test MediaRecorder Record Timeslice</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="manifest.js"></script>
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+var manager = new MediaTestManager;
+
+/**
+ * Starts a test on every media recorder file included to check that a stream
+ * derived from the file can be recorded with a timeslice provided
+ */
+function startTest(test, token) {
+  var element = document.createElement('audio');
+  var expectedMimeType = test.type;
+
+  element.token = token;
+  manager.started(token);
+
+  element.src = test.name;
+  element.test = test;
+  element.preload = "auto";
+
+  // Set up MediaRecorder once loadedmetadata fires and tracks are available.
+  element.onloadedmetadata = function() {
+    element.onloadedmetadata = null;
+
+    const stream = element.mozCaptureStream();
+    const mediaRecorder =
+      new MediaRecorder(stream, {mimeType: expectedMimeType});
+
+    mediaRecorder.onerror = function () {
+      ok(false, 'Unexpected onerror callback fired');
+    };
+
+    mediaRecorder.onwarning = function () {
+      ok(false, 'Unexpected onwarning callback fired');
+    };
+
+    mediaRecorder.onstop = function () {
+      ok(false, 'Unexpected onstop callback fired');
+    };
+
+    var dataAvailableCount = 0;
+    var onDataAvailableFirst = false;
+
+    // This handler fires every 250ms to generate a blob.
+    mediaRecorder.ondataavailable = function (evt) {
+      info('ondataavailable fired');
+      dataAvailableCount++;
+
+      ok(evt instanceof BlobEvent,
+         'Events fired from ondataavailable should be BlobEvent');
+      is(evt.type, 'dataavailable',
+         'Event type should dataavailable');
+      ok(evt.data.size >= 0,
+         'Blob data size received is greater than or equal to zero');
+
+      is(evt.data.type, expectedMimeType,
+         'Blob data received should have type = ' + expectedMimeType);
+      is(mediaRecorder.mimeType, expectedMimeType,
+         'Mime type in ondataavailable = ' + mediaRecorder.mimeType);
+
+      // We'll stop recording upon the 1st blob being received
+      if (dataAvailableCount === 1) {
+        mediaRecorder.onstop = function (event) {
+          info('onstop fired');
+
+          if (!onDataAvailableFirst) {
+            ok(false, 'onstop unexpectedly fired before ondataavailable');
+          }
+          element.pause();
+          manager.finished(token);
+        };
+
+        mediaRecorder.stop();
+        is(mediaRecorder.state, 'inactive',
+           'Media recorder is inactive after being stopped');
+        is(mediaRecorder.stream, stream,
+           'Media recorder stream = element stream post recording');
+
+      } else if (dataAvailableCount === 2) {
+        // Ensure we've received at least two ondataavailable events before onstop
+        onDataAvailableFirst = true;
+      }
+    };
+
+    mediaRecorder.start(1);
+    element.play();
+    is(mediaRecorder.state, 'recording', 'Media recorder should be recording');
+    is(mediaRecorder.stream, stream,
+       'Media recorder stream = element stream at the start of recording');
+  };
+}
+
+manager.runTests(gMediaRecorderTests, startTest);
+</script>
+</pre>
+</body>
+</html>