Add test guaranteed to trigger a SQLAlchemy db connection.

Augment django_db_setup fixture to add sqlalchemy connection cleanup.

kolibri/conftest.py

@@ -7,16 +7,26 @@
 TEMP_KOLIBRI_HOME = "./.pytest_kolibri_home"
 
 
+@pytest.fixture(scope="session")
+def django_db_setup(
+    request,
+    django_db_setup,
+):
+    def dispose_sqlalchemy():
+        from kolibri.core.tasks.main import connection
+
+        connection.dispose()
+
+    request.addfinalizer(dispose_sqlalchemy)
+
+
 @pytest.fixture(scope="session", autouse=True)
 def global_fixture():
     if not os.path.exists(TEMP_KOLIBRI_HOME):
         os.mkdir(TEMP_KOLIBRI_HOME)
     if not os.path.exists(os.path.join(TEMP_KOLIBRI_HOME, "content")):
         os.mkdir(os.path.join(TEMP_KOLIBRI_HOME, "content"))
     yield  # wait until the test ended
-    from kolibri.core.tasks.main import connection
-
-    connection.dispose()
     if os.path.exists(TEMP_KOLIBRI_HOME):
         try:
             shutil.rmtree(TEMP_KOLIBRI_HOME)

kolibri/core/tasks/test/test_no_connection.py

@@ -0,0 +1,8 @@
+import pytest
+
+
+@pytest.mark.django_db
+def test_importing_queue_no_open_connection():
+    from kolibri.core.tasks.main import queue
+
+    queue.empty()