--- a/dom/media/webaudio/test/test_audioParamChaining.html
+++ b/dom/media/webaudio/test/test_audioParamChaining.html
@@ -57,21 +57,21 @@ var rv = gain.gain.setValueAtTime(0, fra
                   .setValueAtTime(0.5, frameToTime(22000, RATE))
                   .setValueAtTime(1, frameToTime(44000, RATE));
 
 ok(rv instanceof AudioParam, "setValueAtTime returns an AudioParam.");
 ok(rv == gain.gain, "setValueAtTime returns the right AudioParam.");
 
 oc.startRendering().then(function(rendered) {
     console.log(rendered.getChannelData(0));
-    ok(rendered.getChannelData(0)[0] == 0,
+    is(rendered.getChannelData(0)[0], 0,
       "The value of the first step is correct.");
-    ok(rendered.getChannelData(0)[22050] == 0.5,
+    is(rendered.getChannelData(0)[22050], 0.5,
       "The value of the second step is correct");
-    ok(rendered.getChannelData(0)[44099] == 1,
+    is(rendered.getChannelData(0)[44099], 1,
       "The value of the third step is correct.");
     SimpleTest.finish();
 });
 
 </script>
 </pre>
 </body>
 </html>