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diff --git a/dom/midi/tests/test_midi_send_messages.html b/dom/midi/tests/test_midi_send_messages.html
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+++ b/dom/midi/tests/test_midi_send_messages.html
@@ -0,0 +1,112 @@
+<html>
+
+<head>
+  <title>WebMIDI Send Test</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <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);
+      const access = await navigator.requestMIDIAccess({ sysex: true });
+      const output = access.outputs.get(await MIDITestUtils.stateTestOutputInfo.id);
+
+
+      // Note on(off).
+      output.send([0xff, 0x90, 0x00, 0x00, 0x90, 0x07, 0x00]);
+
+      try {
+        output.send([0x00, 0x01])
+      } catch (ex) {
+        ok(true, "Caught exception");
+      }
+
+      // Running status is not allowed in Web MIDI API.
+      SimpleTest.doesThrow(() => output.send([0x00, 0x01]), "Running status is not allowed in Web MIDI API.");
+
+      // Unexpected End of Sysex.
+      SimpleTest.doesThrow(() => output.send([0xf7]), "Unexpected End of Sysex.");
+
+      // Unexpected reserved status bytes.
+      SimpleTest.doesThrow(() => output.send([0xf4]), "Unexpected reserved status byte 0xf4.");
+      SimpleTest.doesThrow(() => output.send([0xf5]), "Unexpected reserved status byte 0xf5.");
+      SimpleTest.doesThrow(() => output.send([0xf9]), "Unexpected reserved status byte 0xf9.");
+      SimpleTest.doesThrow(() => output.send([0xfd]), "Unexpected reserved status byte 0xfd.");
+
+      // Incomplete channel messages.
+      SimpleTest.doesThrow(() => output.send([0x80]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0x80, 0x00]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0x90]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0x90, 0x00]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xa0]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xa0, 0x00]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xb0]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xb0, 0x00]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xc0]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xd0]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xe0]), "Incomplete channel message.");
+      SimpleTest.doesThrow(() => output.send([0xe0, 0x00]), "Incomplete channel message.");
+
+      // Incomplete system messages.
+      SimpleTest.doesThrow(() => output.send([0xf1]), "Incomplete system message.");
+      SimpleTest.doesThrow(() => output.send([0xf2]), "Incomplete system message.");
+      SimpleTest.doesThrow(() => output.send([0xf2, 0x00]), "Incomplete system message.");
+      SimpleTest.doesThrow(() => output.send([0xf3]), "Incomplete system message.");
+
+      // Invalid data bytes.
+      SimpleTest.doesThrow(() => output.send([0x80, 0x80, 0x00]), "Incomplete system message.");
+      SimpleTest.doesThrow(() => output.send([0x80, 0x00, 0x80]), "Incomplete system message.");
+
+      // Complete messages.
+      output.send([0x80, 0x00, 0x00]);
+      output.send([0x90, 0x00, 0x00]);
+      output.send([0xa0, 0x00, 0x00]);
+      output.send([0xb0, 0x00, 0x00]);
+      output.send([0xc0, 0x00]);
+      output.send([0xd0, 0x00]);
+      output.send([0xe0, 0x00, 0x00]);
+
+      // Real-Time messages.
+      output.send([0xf8]);
+      output.send([0xfa]);
+      output.send([0xfb]);
+      output.send([0xfc]);
+      output.send([0xfe]);
+      output.send([0xff]);
+
+      // Valid messages with Real-Time messages.
+      output.send([0x90, 0xff, 0xff, 0x00, 0xff, 0x01, 0xff, 0x80, 0xff, 0x00,
+        0xff, 0xff, 0x00, 0xff, 0xff]);
+
+      // Sysex messages.
+      output.send([0xf0, 0x00, 0x01, 0x02, 0x03, 0xf7]);
+      output.send([0xf0, 0xf8, 0xf7, 0xff]);
+      SimpleTest.doesThrow(() => output.send([0xf0, 0x80, 0xf7]), "Invalid sysex message.");
+      SimpleTest.doesThrow(() => output.send([0xf0, 0xf0, 0xf7]), "Double begin sysex message.");
+      SimpleTest.doesThrow(() => output.send([0xf0, 0xff, 0xf7, 0xf7]), "Double end sysex message.");
+
+      // Reserved status bytes.
+      SimpleTest.doesThrow(() => output.send([0xf4, 0x80, 0x00, 0x00]), "Reserved status byte.");
+      SimpleTest.doesThrow(() => output.send([0x80, 0xf4, 0x00, 0x00]), "Reserved status byte.");
+      SimpleTest.doesThrow(() => output.send([0x80, 0x00, 0xf4, 0x00]), "Reserved status byte.");
+      SimpleTest.doesThrow(() => output.send([0x80, 0x00, 0x00, 0xf4]), "Reserved status byte.");
+      SimpleTest.doesThrow(() => output.send([0xf0, 0xff, 0xf4, 0xf7]), "Reserved status byte.");
+
+      // Invalid timestamps.
+      SimpleTest.doesThrow(() => output.send([], NaN), "NaN timestamp.");
+      SimpleTest.doesThrow(() => output.send([], Infinity), "Infinity timestamp.");
+      SimpleTest.doesThrow(() => output.send(new Uint8Array(), NaN), "NaN timestamp.");
+      SimpleTest.doesThrow(() => output.send(new Uint8Array(), Infinity), "Infinity timestamp.");
+
+      SimpleTest.finish();
+    }
+  </script>
+</body>
+
+</html>