Revert "fixme: skip tests broken due to exception removed upstream"

This reverts commit 8eae13c.

Author: miketheman

pyramid_openapi3/exceptions.py

@@ -2,7 +2,7 @@
 
 from dataclasses import dataclass
 from openapi_core.exceptions import OpenAPIError
-# from openapi_core.unmarshalling.schemas.exceptions import FormatUnmarshalError
+from openapi_core.unmarshalling.schemas.exceptions import FormatUnmarshalError
 from pyramid.httpexceptions import HTTPBadRequest
 from pyramid.httpexceptions import HTTPInternalServerError
 from pyramid.request import Request
@@ -49,17 +49,14 @@ def __str__(self) -> str:
 
 
 @dataclass
-# class InvalidCustomFormatterValue(FormatUnmarshalError):
-# FIXME: `FormatUnmarshalError` is not available in `openapi-core` 0.19.0
-# See https://github.com/python-openapi/openapi-core/pull/562
-class InvalidCustomFormatterValue(Exception):
+class InvalidCustomFormatterValue(FormatUnmarshalError):
     """Value failed to format with a custom formatter."""
 
     field: str
 
     def __str__(self) -> str:
         """Provide more control over error message."""
-        return str(self.original_exception)  # type: ignore
+        return str(self.original_exception)
 
 
 class ImproperAPISpecificationWarning(UserWarning):

pyramid_openapi3/tests/test_extract_errors.py

@@ -556,7 +556,6 @@ def foo(*args: t.Any) -> Exception:
         ]
 
 
-@unittest.skip("Needs to be re-implemented")
 class CustomFormattersTests(unittest.TestCase):
     """A suite of tests that showcase how custom formatters can be used."""