1 files changed, 51 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html b/testing/web-platform/tests/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html
new file mode 100644
index 0000000000..d09f2ec352
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-pannernode-interface/panner-azimuth.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test Panner Azimuth Calculation</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="../../resources/audit.js"></script>
+  </head>
+
+  <body>
+    <script>
+      const audit = Audit.createTaskRunner();
+
+      // Fairly arbitrary sample rate
+      const sampleRate = 16000;
+
+      audit.define('Azimuth calculation', (task, should) => {
+        // Two channels for the context so we can see each channel of the
+        // panner node.
+        let context = new OfflineAudioContext(2, sampleRate, sampleRate);
+
+        let src = new ConstantSourceNode(context);
+        let panner = new PannerNode(context);
+
+        src.connect(panner).connect(context.destination);
+
+        // The source is still pointed directly at the listener, but is now
+        // directly above.  The audio should be the same in both the left and
+        // right channels.
+        panner.positionY.value = 1;
+
+        src.start();
+
+        context.startRendering()
+            .then(audioBuffer => {
+              // The left and right channels should contain the same signal.
+              let c0 = audioBuffer.getChannelData(0);
+              let c1 = audioBuffer.getChannelData(1);
+
+              let expected = Math.fround(Math.SQRT1_2);
+
+              should(c0, 'Left channel').beConstantValueOf(expected);
+              should(c1, 'Righteft channel').beConstantValueOf(expected);
+            })
+            .then(() => task.done());
+      });
+
+      audit.run();
+    </script>
+  </body>
+</html>