update

tests/test_errors.py

@@ -1,6 +1,6 @@
 """Tests for flow.core.errors."""
 
-from flow.core.errors import ConfigError, ExecutionError, FlowError, PlanConflict
+from flow.core.errors import ConfigError, FlowError, PlanConflict
 
 
 def test_flow_error_is_exception():
@@ -15,7 +15,3 @@ def test_plan_conflict_carries_conflicts():
     err = PlanConflict("2 conflicts", ["a exists", "b exists"])
     assert str(err) == "2 conflicts"
     assert err.conflicts == ["a exists", "b exists"]
-
-
-def test_execution_error_is_flow_error():
-    assert issubclass(ExecutionError, FlowError)