I think all the tests might pass this time.

test.py

@@ -45,10 +45,6 @@ def mockMciSendStringW(command, buf, bufLen, bufStart):
     decodeCommand = command.decode('utf-16')
 
     # Error code 305 ("Cannot specify extra characters after a string enclosed in quotation marks.") should never be tolerated.
-
-    if decodeCommand.startswith(u'open '):
-        testCase.assertIn(originalMCISendStringW(command, buf, bufLen, bufStart), [0, 306])  # 306 indicates drivers are missing. It's fine.
-        return 0
 
     if decodeCommand.startswith(u'close '):
         global sawClose
@@ -58,11 +54,10 @@ def mockMciSendStringW(command, buf, bufLen, bufStart):
 
     if decodeCommand.endswith(u' wait'):
         sleep(expectedDuration)
-
-    if decodeCommand.startswith(u'play '):
-        return originalMCISendStringW(command, buf, bufLen, bufStart)
-        #testCase.assertEqual(originalMCISendStringW(command, buf, bufLen, bufStart), 0)
-        #return 0
+
+    if decodeCommand.startswith(u'open ') or decodeCommand.startswith(u'play '):
+        testCase.assertIn(originalMCISendStringW(command, buf, bufLen, bufStart), [0, 306])  # 306 indicates drivers are missing. It's fine.
+        return 0
 
 class PlaysoundTests(unittest.TestCase):
     def helper(self, file, approximateDuration, block = True):