passing redis host

.gitlab-ci.yml

 image: python:latest
 
+variables:
+  REDIS_HOST: redis
+
 before_script:
   - pip install -r requirements_dev.txt
   - pip install .

tests/test_queue.py

+import os
 from datetime import datetime
 
 import pytest
@@ -7,10 +8,11 @@ from vsq.queue import (
     Queue, TaskFailedException, TaskTimeoutException, TaskStatus
 )
 
+
 @pytest.fixture
 def redis():
     redis = Redis(
-        'localhost',
+        os.environ.get('REDIS_HOST', 'localhost'),
         6379,
     )
     yield redis