add a test_index test

sensors/collector/tests/test_views.py

@@ -0,0 +1,14 @@
+import pytest
+from mixer.backend.django import mixer
+
+from django.test import Client
+
+from .helper import in_content, not_in_content
+
+pytestmark=pytest.mark.django_db
+
+
+def test_index_temperature():
+    response = Client().get('/')
+    assert response.status_code == 200
+