don't try subclassing magicmock

pytest_flask_sqlalchemy/fixtures.py

@@ -93,10 +93,8 @@ def _engine(pytestconfig, request, _transaction, mocker):
 
     # Make sure that any attempts to call `connect()` simply return a
     # reference to the open connection
-    class EngineMock(mocker.MagicMock):
-        pass
 
-    engine = EngineMock(spec=sa.engine.Engine)
+    engine = mocker.MagicMock(spec=sa.engine.Engine)
 
     engine.connect.return_value = connection
 
@@ -109,10 +107,10 @@ class EngineMock(mocker.MagicMock):
         engine._contextual_connect.return_value = connection
 
     # Calls to execution_options should return this mocked engine.
-    # engine.execution_options.return_value = engine
+    engine.execution_options.return_value = engine
 
     if version.parse(sa.__version__) >= version.parse('1.4'):
-        sa.inspection._registrars[EngineMock] = sa.engine.Inspector._engine_insp
+        sa.inspection._registrars[mocker.MagicMock] = sa.engine.Inspector._engine_insp
 
     # References to `Engine.dialect` should redirect to the Connection (this
     # is primarily useful for the `autoload` flag in SQLAlchemy, which references