Adds tests for brokers

* test for redis and django-redis
* test for disque

TODO add disque to Travis

django_q/tests/test_brokers.py

@@ -0,0 +1,61 @@
+from time import sleep
+import pytest
+from django_q.conf import Conf
+from django_q.brokers import get_broker, Broker
+
+
+def test_broker():
+    broker = Broker()
+    broker.enqueue('test')
+    broker.dequeue()
+    broker.queue_size()
+    broker.delete_queue()
+    broker.acknowledge('test')
+    broker.ping()
+    assert broker.get_stat('test_1') is None
+    broker.set_stat('test_1', 'test', 3)
+    assert broker.get_stat('test_1') == 'test'
+    assert broker.get_stats('test:*')[0] == 'test'
+
+
+def test_redis():
+    Conf.DJANGO_REDIS = None
+    broker = get_broker()
+    assert broker.ping() is True
+    Conf.REDIS = {'host': '127.0.0.1', 'port': 7712}
+    broker = get_broker()
+    with pytest.raises(Exception):
+        broker.ping()
+
+
+def test_disque():
+    Conf.DISQUE = ['127.0.0.1:7711']
+    broker = get_broker()
+    assert broker.ping() is True
+    broker.enqueue('test')
+    assert broker.queue_size() == 1
+    task = broker.dequeue()
+    assert task[1] == 'test'
+    broker.acknowledge(task[0])
+    assert broker.queue_size() == 0
+    # Retry test
+    Conf.RETRY = 1
+    broker.enqueue('test')
+    assert broker.queue_size() == 1
+    broker.dequeue()
+    assert broker.queue_size() == 0
+    sleep(1.5)
+    assert broker.queue_size() == 1
+    task = broker.dequeue()
+    assert broker.queue_size() == 0
+    broker.acknowledge(task[0])
+    sleep(1.5)
+    assert broker.queue_size() == 0
+    # errors
+    with pytest.raises(NotImplementedError):
+        broker.delete_queue()
+    Conf.DISQUE = ['127.0.0.1:7712', '127.0.0.1:7713']
+    with pytest.raises(ConnectionError):
+        broker.get_connection()
+    # back to djangoredis
+    Conf.DJANGO_REDIS = 'default'