Split long callback tests.

Author: T4rk1n

tests/integration/long_callback/conftest.py

@@ -0,0 +1,15 @@
+import os
+
+import pytest
+
+
+if "REDIS_URL" in os.environ:
+    managers = ["celery", "diskcache"]
+else:
+    print("Skipping celery tests because REDIS_URL is not defined")
+    managers = ["diskcache"]
+
+
+@pytest.fixture(params=managers)
+def manager(request):
+    return request.param