Adding test functionality.

.travis.yml

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+language: python
+python:
+    - "2.7"
+    - "3.6"
+install:
+    - pip install -r requirements/test.txt
+script:
+    py.test -v

requirements/base.txt

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+-e .
+certifi
+paho-mqtt==1.2.3
+requests

requirements/test.txt

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+-r base.txt

tests/test_client.py

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+import unittest
+
+import microgear
+from microgear.client import create
+
+
+class ClientCreateTests(unittest.TestCase):
+    def setUp(self):
+        self.gearkey = '1a2b3c4d5e6f7g8'
+        self.gearsecret = 'A1B2C3d4e5f6G7H8i9j10k11L'
+        self.appid = 'FooBar'
+        self.gearalias = 'strecth'
+        self.gearalias_more_than_16_characters = 'jessiestretchbuster'
+
+
+    def tearDown(self):
+        microgear.client.subscribe_list = []
+
+    def test_default_global_variables(self):
+        self.assertEqual(microgear.client.subscribe_list, [])
+
+    def connection(self):
+        return 'Connected'
+
+    def subscription(self, topic, message):
+        return topic + ' ' + message
+
+    def disconnect(self):
+        return 'Disconnected'
+
+
+    def test_create(self):
+        """
+        Test create client with `gearkey`, `gearsecret` and `appid` paremeters.
+        """
+
+        create(self.gearkey, self.gearsecret, self.appid)
+
+        self.assertEqual(microgear.gearkey, self.gearkey)
+        self.assertEqual(microgear.gearsecret, self.gearsecret)
+        self.assertEqual(microgear.appid, self.appid)
+
+    def test_create_with_gear_alias(self):
+        """
+        Test create client with `alias` argument settings.
+        """
+        create(self.gearkey,
+               self.gearsecret,
+               self.appid,
+               {'alias': self.gearalias}
+        )
+
+        self.assertEqual(microgear.gearalias, self.gearalias)
+
+    def test_create_with_gear_alias(self):
+        """
+        Test create client with `alias` argument settings more than 16
+        characters..
+        """
+        create(
+            self.gearkey,
+            self.gearsecret,
+            self.appid,
+            {'alias': self.gearalias_more_than_16_characters}
+        )
+
+        self.assertNotEqual(
+                microgear.gearalias,
+                self.gearalias_more_than_16_characters
+        )
+        self.assertEqual(
+                microgear.gearalias,
+                self.gearalias_more_than_16_characters[0:16]
+        )
+
+    def test_on_connect(self):
+        """
+        Test create on_connect function.
+        """
+        microgear.on_connect = self.connection
+
+        self.assertEqual(microgear.on_connect(), 'Connected')
+        self.assertNotEqual(microgear.on_connect(), 'Disconnected')
+
+    def test_on_message(self):
+        """
+        Test create on_connect function.
+        """
+        microgear.on_message = self.subscription
+
+        self.assertEqual(microgear.on_message('topic', 'message'), 'topic message')
+        self.assertEqual(microgear.on_message('', 'message'), ' message')
+        self.assertEqual(microgear.on_message('topic', ''), 'topic ')
+
+    def test_on_disconnect(self):
+        """
+        Test create on_connect function.
+        """
+        microgear.on_disconnect = self.disconnect
+
+        self.assertEqual(microgear.on_disconnect(), 'Disconnected')
+        self.assertNotEqual(microgear.on_disconnect(), 'Connected')
+
+    def test_client_subscribe(self):
+        microgear.client.subscribe_list = []
+        microgear.appid = self.appid
+        microgear.client.subscribe('message')
+        self.assertEqual(microgear.client.subscribe_list, ['/FooBarmessage'])
+