1. Add unit test cases;

2. Add device test core file;

jpush/device/core.py

+#!/usr/bin/env python
+
+class Device(object):
+    """Device info query/update..
+
+    """
+    def __init__(self):
+        self.entity = None
+    
+
+class DeviceResponse(object):
+    """
+    """

tests/push/test_audience.py

+import unittest
+import jpush as jpush
+
+class TestAudience(unittest.TestCase):
+
+    def test_basic_selectors(self):
+        selectors = (
+            (jpush.tag, 'tag1', {'tag': ['tag1']}),
+            (jpush.tag_and, 'tag1', {'tag_and': ['tag1']}),
+            (jpush.alias, 'alias1', {'alias':'alias1'}),
+            (jpush.registration_id, 'regid1', {'registration_id':'regid1'}),
+        )
+        for selector, value, result in selectors:
+            self.assertEqual(selector(value), result)