added first test

test/test_db.py

@@ -0,0 +1,20 @@
+from sqlite3 import connect
+from recipe_graph import db
+from sqlalchemy.exc import SQLAlchemyError
+import sqlalchemy
+
+import pytest
+
+@pytest.fixture
+def engine() -> sqlalchemy.engine.Engine:
+    return db.get_engine()
+
+def test_db_connection(engine):
+    connected = False
+    try:
+        engine.connect()
+        connected = True
+    except (SQLAlchemyError):
+        pass
+    finally:
+        assert(connected == True)