Added test_get_policy_dictionary

tests/test_policy.py

@@ -0,0 +1,13 @@
+import unittest
+from paramiko.client import RejectPolicy, WarningPolicy
+from webssh.policy import AutoAddPolicy, get_policy_dictionary
+
+
+class TestPolicy(unittest.TestCase):
+
+    def test_get_policy_dictionary(self):
+        classes = [AutoAddPolicy, RejectPolicy, WarningPolicy]
+        dic = get_policy_dictionary()
+        for cls in classes:
+            val = dic[cls.__name__.lower()]
+            self.assertIs(cls, val)