Add second example unused-local-variable.py, currently defunct

Author: amotl

.github/workflows/tests.yml

@@ -17,6 +17,14 @@ jobs:
   test:
 
     runs-on: "ubuntu-latest"
+
+    services:
+
+      cratedb:
+        image: crate:5.1.1
+        ports:
+          - 4200:4200
+
     steps:
 
       - name: Acquire sources
@@ -30,7 +38,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install pytest
+          pip install pytest crate[sqlalchemy]
 
       - name: Run tests
         run: |

unused-local-variable.py

@@ -0,0 +1,48 @@
+"""
+Evaluate CodeQL scan false positive with `py/unused-local-variable`.
+
+Synopsis::
+
+    pip install pytest crate[sqlalchemy]
+    docker run --rm -it --publish=4200:4200 crate:5.1.1
+    pytest unused-local-variable.py
+"""
+from unittest.mock import MagicMock, patch
+
+import pytest
+import sqlalchemy as sa
+from crate.client.cursor import Cursor
+from sqlalchemy.orm import declarative_base
+
+pytest.skip(reason="Implementation incomplete", allow_module_level=True)
+
+
+fake_cursor = MagicMock(name="fake_cursor")
+FakeCursor = MagicMock(name="FakeCursor", spec=Cursor)
+FakeCursor.return_value = fake_cursor
+
+
+class DbWrapper:
+    def __init__(self):
+        self.engine = sa.create_engine("crate://")
+        self.Base = declarative_base(bind=self.engine)
+
+
+@pytest.fixture
+def db():
+    return DbWrapper()
+
+
+@patch("crate.client.connection.Cursor", FakeCursor)
+def test_table_with_object_array(db):
+
+    db.Base.metadata.create_all()
+    fake_cursor.execute.assert_called_with(
+        (
+            "\nCREATE TABLE t (\n\t"
+            "pk STRING, \n\t"
+            "tags ARRAY(OBJECT), \n\t"
+            "PRIMARY KEY (pk)\n)\n\n"
+        ),
+        (),
+    )