test.py topology: session scope for common fixtures

Change default pytest-asyncio event_loop fixture scope to session to
allow async fixtures with scope larger than function.

See pytest-dev/pytest-asyncio#68

Change temporarily table1 fixture to session scope.

Signed-off-by: Alejo Sanchez <[email protected]>

Author: Alejo Sanchez

test/conftest.py

@@ -15,6 +15,7 @@
 from cassandra.cluster import ExecutionProfile, EXEC_PROFILE_DEFAULT     # type: ignore
 from cassandra.policies import RoundRobinPolicy                          # type: ignore
 from test.pylib.util import unique_name                                  # type: ignore
+import asyncio
 import pytest
 import ssl
 
@@ -30,6 +31,17 @@ def pytest_addoption(parser):
     parser.addoption('--ssl', action='store_true',
                      help='Connect to CQL via an encrypted TLSv1.2 connection')
 
+
+# Change default pytest-asyncio event_loop fixture scope to session to
+# allow async fixtures with scope larger than function.
+# See https://github.com/pytest-dev/pytest-asyncio/issues/68
+@pytest.fixture(scope="session")
+def event_loop(request):
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+
 # "cql" fixture: set up client object for communicating with the CQL API.
 # The host/port combination of the server are determined by the --host and
 # --port options, and defaults to localhost and 9042, respectively.

test/topology/test_null.py

@@ -8,7 +8,7 @@
 import pytest
 
 
-@pytest.fixture(scope="module")
+@pytest.fixture(scope="session")
 def table1(cql, test_keyspace):
     table = test_keyspace + "." + unique_name()
     cql.execute(f"CREATE TABLE {table} (p text, c text, v text, primary key (p, c))")