fixed lint

Author: daniel-sanche

packages/google-cloud-firestore/google/cloud/firestore_v1/pipeline_expressions.py

@@ -1098,7 +1098,6 @@ def parent(self) -> "Expression":
         """
         return FunctionExpression("parent", [self])
 
-
     @expose_as_static
     def sum(self) -> "Expression":
         """Creates an aggregation that calculates the sum of a numeric field across multiple stage inputs.

packages/google-cloud-firestore/tests/unit/v1/test_pipeline_expressions.py

@@ -942,7 +942,10 @@ def test_switch_on(self):
         instance = Expression.switch_on(arg1, arg2, arg3, arg4, arg5)
         assert instance.name == "switch_on"
         assert instance.params == [arg1, arg2, arg3, arg4, arg5]
-        assert repr(instance) == "Condition1.switch_on(Result1, Condition2, Result2, Default)"
+        assert (
+            repr(instance)
+            == "Condition1.switch_on(Result1, Condition2, Result2, Default)"
+        )
         infix_instance = arg1.switch_on(arg2, arg3, arg4, arg5)
         assert infix_instance == instance