Fix mypy tests (#1444)

Also remove lower pins in dev groups since we fully lock anyways.

Author: hynek

pyproject.toml

@@ -37,26 +37,18 @@ Tidelift = "https://tidelift.com/subscription/pkg/pypi-attrs?utm_source=pypi-att
 
 
 [dependency-groups]
-tests-mypy = [
-  # A transitive dependency of pytest-mypy-plugins doesn't build on 3.14 yet.
-  'pytest-mypy-plugins; platform_python_implementation == "CPython" and python_version >= "3.10" and python_version < "3.14"',
-  # Since the mypy error messages keep changing, we have to keep updating this
-  # pin.
-  'mypy>=1.11.1; platform_python_implementation == "CPython" and python_version >= "3.10"',
-]
+tests-mypy = ['pytest-mypy-plugins; platform_python_implementation == "CPython" and python_version >= "3.10"']
 tests = [
   { include-group = "tests-mypy" },
   # For regression test to ensure cloudpickle compat doesn't break.
   'cloudpickle; platform_python_implementation == "CPython"',
   "hypothesis",
   "pympler",
-  # 4.3.0 dropped last use of `convert`
-  "pytest>=4.3.0",
+  "pytest",
 ]
 cov = [
   { include-group = "tests" },
-  # Ensure coverage is new enough for `source_pkgs`.
-  "coverage[toml]>=5.3",
+  "coverage[toml]",
 ]
 pyright = ["pyright", { include-group = "tests" }]
 benchmark = [

tests/test_mypy.yml

@@ -604,7 +604,7 @@
         parent: Optional[A]
 
     reveal_type(A) # N: Revealed type is "def (parent: main.B) -> main.A"
-    reveal_type(B) # N: Revealed type is "def (parent: Union[main.A, None]) -> main.B"
+    reveal_type(B) # N: Revealed type is "def (parent: main.A | None) -> main.B"
     A(B(None))
 
 - case: testAttrsForwardReferenceInClass
@@ -620,7 +620,7 @@
             parent: Optional[A]
 
     reveal_type(A) # N: Revealed type is "def (parent: main.A.B) -> main.A"
-    reveal_type(A.B) # N: Revealed type is "def (parent: Union[main.A, None]) -> main.A.B"
+    reveal_type(A.B) # N: Revealed type is "def (parent: main.A | None) -> main.A.B"
     A(A.B(None))
 
 - case: testAttrsImporting
@@ -739,7 +739,7 @@
 
     AOrB = Union[A, B]
 
-    reveal_type(A)  # N: Revealed type is "def (frob: builtins.list[Union[main.A, main.B]]) -> main.A"
+    reveal_type(A)  # N: Revealed type is "def (frob: builtins.list[main.A | main.B]) -> main.A"
     reveal_type(B)  # N: Revealed type is "def () -> main.B"
 
     A([B()])