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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test the OscillatorNode when the frequency is negative</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="webaudio.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();
+addLoadEvent(function() {
+
+ var types = ["sine",
+ "square",
+ "sawtooth",
+ "triangle"];
+
+ var finished = 0;
+ function finish() {
+ if (++finished == types.length) {
+ SimpleTest.finish();
+ }
+ }
+
+ types.forEach(function(t) {
+ var context = new OfflineAudioContext(1, 256, 44100);
+ var osc = context.createOscillator();
+
+ osc.frequency.value = -440;
+ osc.type = t;
+
+ osc.connect(context.destination);
+ osc.start();
+ context.startRendering().then(function(buffer) {
+ var samples = buffer.getChannelData(0);
+ // This samples the wave form in the middle of the first period, the value
+ // should be negative.
+ ok(samples[Math.floor(44100 / 440 / 4)] < 0., "Phase should be inverted when using a " + t + " waveform");
+ finish();
+ });
+ });
+});
+
+</script>
+</pre>
+</body>
+</html>