test_midi_device_connect_disconnect.html

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<html>

  <head>

    <title>WebMIDI Listener Test</title>

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

    <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />

    <script type="application/javascript" src="MIDITestUtils.js"></script>

  </head>

  <body onload="runTests()">

    <script class="testbody" type="application/javascript">

     SimpleTest.waitForExplicitFinish();

     async function runTests() {

       await MIDITestUtils.permissionSetup(true);

       let output;

       let midi_access;

       try {

         midi_access = await navigator.requestMIDIAccess({ "sysex": false });

         ok(true, "MIDI Access Request successful");

       } catch (e) {

         ok(false, "MIDI Access Request failed!");

         SimpleTest.finish();

         return;

       is(midi_access.sysexEnabled, false, "Sysex should be false");

       output = midi_access.outputs.get(await MIDITestUtils.outputInfo.id);

       let statePromiseRes;

       let statePromise = new Promise((res) => { statePromiseRes = res; });

       await output.open();

       let stateChangeHandler = (event) => {

         if (event.port == output) {

           return;

         statePromiseRes(event.port);

};

       midi_access.addEventListener("statechange", stateChangeHandler);

       // Send command to connect new port.

       output.send([0x90, 0x01, 0x00]);

       let p = await statePromise;

       is(p.state, "connected", "Device " + p.name + " connected");

       // Rebuild our promise, we'll need to await another one.

       statePromise = new Promise((res) => { statePromiseRes = res; });

       output.send([0x90, 0x02, 0x00]);

       p = await statePromise;

       is(p.state, "disconnected", "Device " + p.name + " disconnected");

       midi_access.removeEventListener("statechange", stateChangeHandler);

       SimpleTest.finish();

    </script>

  </body>

</html>