Ensure consistent name for generated Union class

...by ensuring consistent ordering of the classes from which it's
constructed, based on the class name.

Author: necaris

graphene_pydantic/converters.py

@@ -351,11 +351,7 @@ def convert_literal_type(
     inner_types = type_.__args__
     # Here we'll expand the subtypes of this Literal into a corresponding more
     # general scalar type.
-    scalar_types = {
-        type(x)
-        for x in inner_types
-        if x != NONE_TYPE
-    }
+    scalar_types = {type(x) for x in inner_types if x != NONE_TYPE}
     graphene_scalar_types = [
         convert_pydantic_type(x, field, registry, parent_type=parent_type, model=model)
         for x in scalar_types
@@ -368,6 +364,10 @@ def convert_literal_type(
     internal_meta_cls = type("Meta", (), {"types": graphene_scalar_types})
 
     union_cls = type(
-        construct_union_class_name(scalar_types), (Union,), {"Meta": internal_meta_cls}
+        construct_union_class_name(
+            sorted(scalar_types, key=lambda x: x.__class__.__name__)
+        ),
+        (Union,),
+        {"Meta": internal_meta_cls},
     )
     return union_cls

tests/test_converters.py

@@ -74,17 +74,18 @@ def test_union():
     assert field.default_value == 5.0
     assert field.type.__name__.startswith("UnionOf")
 
+
 def test_literal():
-    field = _convert_field_from_spec("attr", (T.Literal['literal1', 'literal2', 3], 3))
+    field = _convert_field_from_spec("attr", (T.Literal["literal1", "literal2", 3], 3))
     assert issubclass(field.type, graphene.Union)
     assert field.default_value == 3
     assert field.type.__name__.startswith("UnionOf")
 
 
 def test_literal_singleton():
-    field = _convert_field_from_spec("attr", (T.Literal['literal1'], 'literal1'))
+    field = _convert_field_from_spec("attr", (T.Literal["literal1"], "literal1"))
     assert issubclass(field.type, graphene.String)
-    assert field.default_value == 'literal1'
+    assert field.default_value == "literal1"
     assert field.type == graphene.String