#150: Add pytest fixtures for filter testing

- Since they're placed in conftest.py, pytest will automatically pick these up, they don't need to be imported into the places I use them in

test/conftest.py

@@ -0,0 +1,20 @@
+from icat.client import Client
+from icat.query import Query
+import pytest
+
+from datagateway_api.common.config import config
+
+
+@pytest.fixture(scope="package")
+def icat_client():
+    client = Client(config.get_icat_url(), checkCert=config.get_icat_check_cert())
+    client.login(config.get_test_mechanism(), config.get_test_user_credentials())
+    print(f"ID: {client.sessionId}")
+    return client
+
+
+@pytest.fixture()
+def icat_query(icat_client):
+    query = Query(icat_client, "Investigation")
+
+    return query