Add devices API test cases;

tests/devices/test_devices.py

+import unittest
+import requests
+import jpush

tests/devices/test_entity.py

+import unittest
+import jpush
+
+class TestEntity(unittest.TestCase):
+
+    def test_basic_entity(self):
+        entities = (
+            (jpush.add, 'tag1', {'add': ['tag1']}),
+            (jpush.remove, 'tag1', {'remove': ['tag1']}),
+            (jpush.device_tag, 'tag1', {'tags': 'tag1'}),
+            (jpush.device_alias, 'alias1', {'alias': 'alias1'}),
+            (jpush.device_regid, 'registration_id1', {'registration_ids': 'registration_id1'}),
+        )
+        for entity, value, result in entities:
+            self.assertEqual(entity(value), result)
+
+    def test_compound_entity(self):
+        self.assertEqual(
+            jpush.device_tag(jpush.add("tag1", "tag2")),
+            {'tags':{'add':['tag1', 'tag2']}})
+
+        self.assertEqual(
+            jpush.device_tag(jpush.remove("tag1", "tag2")),
+            {'tags':{'remove':['tag1', 'tag2']}})
+
+        self.assertEqual(
+            jpush.device_alias(jpush.add("alias1", "alias2"), jpush.remove("alias3", "alias4")),
+            {'alias':{'add':['alias1', 'alias2'], 'remove':['alias3', 'alias4']}})
+
+        self.assertEqual(
+            jpush.device_regid(jpush.add("regid1", "regid2"), jpush.remove("regid3", "regid4")),
+            {'registration_ids':{'add':['regid1', 'regid2'], 'remove':['regid3', 'regid4']}})