Skip on 3.6 because isinstance(t.Sequence[int], type).

Author: desert

src/desert/_make.py

@@ -102,6 +102,7 @@ def class_schema(clazz: type, meta: Dict[str, Any] = {}) -> Type[marshmallow.Sch
     """
 
     fields: Union[Tuple[dataclasses.Field], Tuple[attr.Attribute]]
+
     if not isinstance(clazz, type):
         raise desert.exceptions.UnknownType(
             f"Desert failed to infer the field type for {clazz}.\n"

tests/test_make.py

@@ -1,6 +1,7 @@
 import dataclasses
 import datetime
 import enum
+import sys
 import types
 import typing as t
 
@@ -357,6 +358,9 @@ class A:
         desert.schema_class(A)
 
 
+@pytest.mark.skipif(
+    sys.version_info[:2] <= (3, 6), reason="3.6 has isinstance(t.Sequence[int], type)."
+)
 def test_raise_unknown_generic(module):
     """Raise UnknownType for unknown generics."""