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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: basic functionality</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+// This test checks that readyState is properly set and the appropriate events are being fired accordingly:
+// 1. Load 1.6s of data and ensure that canplay event is fired.
+// 2. Load data to have a complete buffered range from 0 to duration and ensure that canplaythrough is fired.
+// 3. Seek to an area with no buffered data, and ensure that readyState goes back to HAVE_METADATA
+// 4. Load 1.6s of data at the seek position and ensure that canplay is fired and that readyState is now HAVE_FUTURE_DATA
+// 5. Start playing video and check that once it reaches a position with no data, readyState goes back to HAVE_CURRENT_DATA and waiting event is fired.
+// 6. Add 1.6s of data once video element fired waiting, that canplay is fired once readyState is HAVE_FUTURE_DATA.
+// 7. Finally load data to the end and ensure that canplaythrough is fired and that readyState is now HAVE_ENOUGH_DATA
+
+runWithMSE(function(ms, el) {
+  el.controls = true;
+  once(ms, 'sourceopen').then(function() {
+    // Log events for debugging.
+    var events = ["suspend", "play", "canplay", "canplaythrough", "loadstart", "loadedmetadata",
+                  "loadeddata", "playing", "ended", "error", "stalled", "emptied", "abort",
+                  "waiting", "pause", "durationchange", "seeking", "seeked"];
+    function logEvent(e) {
+      var v = e.target;
+      info("got " + e.type + " event");
+    }
+    events.forEach(function(e) {
+      el.addEventListener(e, logEvent, false);
+    });
+
+    ok(true, "Receive a sourceopen event");
+    var videosb = ms.addSourceBuffer("video/mp4");
+    el.addEventListener("error", function(e) {
+      ok(false, "should not fire '" + e + "' event");
+    });
+    is(el.readyState, el.HAVE_NOTHING, "readyState is HAVE_NOTHING");
+    fetchAndLoad(videosb, 'bipbop/bipbop_video', ['init'], '.mp4')
+    .then(once.bind(null, el, 'loadedmetadata'))
+    .then(function() {
+       ok(true, "got loadedmetadata event");
+       var promises = [];
+       promises.push(once(el, 'loadeddata'));
+       promises.push(once(el, 'canplay'));
+       promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(1, 3), '.m4s'));
+       return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got canplay event");
+      // set element duration to 3.203333s. We do so in order to guarantee that
+      // the end of the buffered range will be equal to duration, causing
+      // canplaythrough to be fired later.
+      ms.duration = 3.203333;
+      return once(el, 'durationchange');
+    })
+    .then(function() {
+      ok(true, "got durationchange event");
+      var promises = [];
+      promises.push(once(el, 'canplaythrough'));
+      // Load [0.801666, 3.203333]
+      promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(3, 5), '.m4s'));
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got canplaythrough event");
+     // set element duration to 9.203333s, this value is set to coincide with
+     // data added later (we now have an empty range from 6s to 9.203333s).
+     ms.duration = 9.203333;
+     return once(el, 'durationchange');
+    })
+    .then(function() {
+      ok(true, "got durationchange event");
+      // An arbitrary value, so we are guaranteed to be in a range with no data.
+      el.currentTime = 6;
+      videosb.timestampOffset = 6;
+      ok(el.seeking, "seeking started");
+      return once(el, 'seeking');
+    })
+    .then(function() {
+      ok(true, "got seeking event");
+      is(el.readyState, el.HAVE_METADATA, "readyState is HAVE_METADATA");
+      var promises = [];
+      promises.push(once(el, 'seeked'));
+      promises.push(once(el, 'canplay'));
+      // Load [6+0, 6+1.601666)
+      promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(1, 3), '.m4s'));
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got seeked and canplay event");
+      is(el.currentTime, 6, "seeked to 6s");
+      is(el.readyState, el.HAVE_FUTURE_DATA, "readyState is HAVE_FUTURE_DATA");
+      var promises = [];
+      promises.push(once(el, 'canplaythrough'));
+      // Load [6+1.60166, 6+3.203333]
+      promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(3, 5), '.m4s'));
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got canplaythrough event");
+      // set element duration to 19.805s, this value is set to coincide with
+      // data added later (we now have an empty range from 15 to 19.805).
+      ms.duration = 19.805;
+      return once(el, 'durationchange');
+    })
+    .then(function() {
+      ok(true, "got durationchange event");
+      el.currentTime = 15;
+      videosb.timestampOffset = 15;
+      ok(el.seeking, "seeking started");
+      return once(el, 'seeking');
+    })
+    .then(function() {
+      ok(true, "got seeking event");
+      var promises = [];
+      promises.push(once(el, 'seeked'));
+      // Load [15+0, 15+1.601666)
+      promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(1, 3), '.m4s'));
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got seeked event");
+      // Load [15+1.60166, 15+3.203333]
+      return fetchAndLoad(videosb, 'bipbop/bipbop_video', range(3, 5), '.m4s');
+    })
+    .then(function() {
+      ok(true, "data loaded");
+      // Playback we play for a little while then stall.
+      var promises = [];
+      promises.push(once(el, 'playing'));
+      promises.push(once(el, 'waiting'));
+      el.play();
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got playing and waiting event");
+      // Playback has stalled, readyState is back to HAVE_CURRENT_DATA.
+      is(el.readyState, el.HAVE_CURRENT_DATA, "readyState is HAVE_CURRENT_DATA");
+      var promises = [];
+      promises.push(once(el, 'playing'));
+      promises.push(once(el, 'canplay'));
+      promises.push(once(el, 'canplaythrough'));
+      // Load [15+3.203333, 15+4.805)
+      // Our final buffered range will now be [0, 3.203333)[6, 9.203333)[15, 19.805)
+      promises.push(fetchAndLoad(videosb, 'bipbop/bipbop_video', range(5, 7), '.m4s'));
+      return Promise.all(promises);
+    })
+    .then(function() {
+      ok(true, "got playing, canplay and canplaythrough event");
+      SimpleTest.finish();
+    })
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>