A couple of fixes to make CI tests more resilient (#211)

* Explicitly set PYTHONPATH=. in mypy tests

This prevents issues when marshmallow_dataclass is installed
in editable mode. (See #209, #207.)

* Don't fail tests upon warnings from external packages.

E.g. marshmallow<3.15 generates a deprecation warning from distutils.
There's no reason that should cause a test failure for us.

* Update black target-version config.

I have no idea whether this actually affects anything, but
might as well keep it up-to-date.

* Fix typing of Union._serialize parameter

This tracks a change in type of the `attr` parameter to
`Field._serialize` made in marshmallow 3.18.0.

Here we also switch to using keyword args to typeguard.check_type
in an attempt to protect against upcoming
[changes in its signature](https://typeguard.readthedocs.io/en/latest/api.html#typeguard.check_type).

* Cherry-pick PR #207: Fix broken user types after typing-inspect 0.8.0

This is cherry-picks PR#207 by @vit-zikmund

Author: dairiki

marshmallow_dataclass/__init__.py

@@ -48,6 +48,7 @@ class User:
     Dict,
     List,
     Mapping,
+    NewType as typing_NewType,
     Optional,
     Set,
     Tuple,
@@ -805,12 +806,8 @@ def NewType(
     marshmallow.exceptions.ValidationError: {'mail': ['Not a valid email address.']}
     """
 
-    def new_type(x: _U):
-        return x
-
-    new_type.__name__ = name
     # noinspection PyTypeHints
-    new_type.__supertype__ = typ  # type: ignore
+    new_type = typing_NewType(name, typ)  # type: ignore
     # noinspection PyTypeHints
     new_type._marshmallow_field = field  # type: ignore
     # noinspection PyTypeHints

marshmallow_dataclass/union_field.py

@@ -34,13 +34,15 @@ def _bind_to_schema(self, field_name: str, schema: Schema) -> None:
 
         self.union_fields = new_union_fields
 
-    def _serialize(self, value: Any, attr: str, obj, **kwargs) -> Any:
+    def _serialize(self, value: Any, attr: Optional[str], obj, **kwargs) -> Any:
         errors = []
         if value is None:
             return value
         for typ, field in self.union_fields:
             try:
-                typeguard.check_type(attr, value, typ)
+                typeguard.check_type(
+                    value=value, expected_type=typ, argname=attr or "anonymous"
+                )
                 return field._serialize(value, attr, obj, **kwargs)
             except TypeError as e:
                 errors.append(e)
@@ -53,7 +55,9 @@ def _deserialize(self, value: Any, attr: Optional[str], data, **kwargs) -> Any:
         for typ, field in self.union_fields:
             try:
                 result = field.deserialize(value, **kwargs)
-                typeguard.check_type(attr or "anonymous", result, typ)
+                typeguard.check_type(
+                    value=result, expected_type=typ, argname=attr or "anonymous"
+                )
                 return result
             except (TypeError, ValidationError) as e:
                 errors.append(e)

pyproject.toml

@@ -1,8 +1,8 @@
 [tool.black]
 line-length = 88
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py36', 'py37', 'py38', 'py39', 'py310']
 
 [tool.pytest.ini_options]
 filterwarnings = [
-    "error",
+    "error:::marshmallow_dataclass|test",
 ]

tests/test_mypy.yml

@@ -5,6 +5,8 @@
   mypy_config: |
     follow_imports = silent
     plugins = marshmallow_dataclass.mypy
+  env:
+    - PYTHONPATH=.
   main: |
     from dataclasses import dataclass
     import marshmallow as ma
@@ -28,6 +30,8 @@
   mypy_config: |
     follow_imports = silent
     plugins = marshmallow_dataclass.mypy
+  env:
+    - PYTHONPATH=.
   main: |
     from marshmallow_dataclass import dataclass
 
@@ -41,6 +45,8 @@
   mypy_config: |
     follow_imports = silent
     plugins = marshmallow_dataclass.mypy
+  env:
+    - PYTHONPATH=.
   main: |
     from dataclasses import dataclass
     import marshmallow