Updated test for auth_plugins to skip Httpasswd when libpass is not available

test-requirements.txt

@@ -3,5 +3,5 @@ nose2
 six
 redis
 wrapt<=1.12.1;python_version<="3.4"
-libpass
-bcrypt
+libpass;python_versions>="3.8"
+bcrypt;python_versions>="3.8"

tests/test_auth_plugins.py

@@ -28,6 +28,13 @@ class BasicHTTPAuthTestCase(unittest.TestCase):
         headers = {'Authorization': 'Basic xxxxxxxxxxxxxxxxxxxxxxxxxxxx'}
         self.assertRaises(AuthenticationError, self.plugin.authenticate, headers, 'localhost', '1234')
 
+try:
+    import passlib
+    PASSLIB_AVAILABLE = True
+except ImportError:
+    PASSLIB_AVAILABLE = False
+
+@unittest.skipUnless(PASSLIB_AVAILABLE, "passlib package is not available")
 class HtpasswdAuthTestCase(unittest.TestCase):
     
     def setUp(self):