Added the web audio mixer to the browser tests

Author: cwoffenden

test/test_browser.py

@@ -5417,6 +5417,14 @@ def test_audio_worklet_post_function(self, args):
   def test_audio_worklet_modularize(self, args):
     self.btest_exit('webaudio/audioworklet.c', args=['-sAUDIO_WORKLET', '-sWASM_WORKERS', '-sMODULARIZE=1', '-sEXPORT_NAME=MyModule', '--shell-file', test_file('shell_that_launches_modularize.html')] + args)
 
+  # We can't test playback, so don't need the data files, we're testing it builds and runs
+  @parameterized({
+    '': ([],),
+    'minimal_with_closure': (['-sMINIMAL_RUNTIME', '--closure', '1', '-Oz'],),
+  })
+  def test_audio_worklet_stereo_io(self, args):
+    self.btest_exit('webaudio/audioworklet_in_out_stereo.c', args=['-sAUDIO_WORKLET', '-sWASM_WORKERS'] + args)
+
   def test_error_reporting(self):
     # Test catching/reporting Error objects
     create_file('post.js', 'throw new Error("oops");')