Add test for ClientSession setup/teardown

tests/test_httputils.py

@@ -0,0 +1,19 @@
+import pytest
+
+from app.utils import httputils
+
+
+@pytest.mark.asyncio
+async def test_setup_teardown_client_session():
+    with pytest.raises(AttributeError):
+        # Ensure client_session is undefined prior to setup
+        httputils.client_session
+
+    await httputils.setup_client_session()
+
+    assert httputils.client_session
+
+    await httputils.teardown_client_session()
+    assert httputils.client_session.closed
+
+    del httputils.client_session