test_interface: Don't assert the missing mixer, gracefully ignore it

Fixes make check on systems that don't have a GstMixer element available

diff --git a/testsuite/test_interface.py b/testsuite/test_interface.py
index 4f4c89c..a89e0e8 100644 (file)
--- a/testsuite/test_interface.py
+++ b/testsuite/test_interface.py
@@ -59,7 +59,6 @@ class MixerTest(TestCase):
             self.mixer = amix.create()
         else:
             self.mixer = None
-        assert self.mixer
 
     def tearDown(self):
         del self.mixer