fixing coverage by simplifying Annotated import logic, fix #2367

pydantic/typing.py

@@ -90,21 +90,7 @@ def evaluate_forwardref(type_: ForwardRef, globalns: Any, localns: Any) -> Any:
         try:
             from typing_extensions import Annotated
         except ImportError:
-            # Create mock Annotated values distinct from `None`, which is a valid `get_origin`
-            # return value.
-            class _FalseMeta(type):
-                # Allow short circuiting with "Annotated[...] if Annotated else None".
-                def __bool__(cls):
-                    return False
-
-                # Give a nice suggestion for unguarded use
-                def __getitem__(cls, key):
-                    raise RuntimeError(
-                        'Annotated is not supported in this python version, please `pip install typing-extensions`.'
-                    )
-
-            class Annotated(metaclass=_FalseMeta):
-                pass
+            Annotated = None
 
 
 # Annotated[...] is implemented by returning an instance of one of these classes, depending on

tests/test_annotated.py

@@ -7,8 +7,9 @@
 from pydantic.fields import Undefined
 from pydantic.typing import Annotated
 
+pytestmark = pytest.mark.skipif(not Annotated, reason='typing_extensions not installed')
+
 
-@pytest.mark.skipif(not Annotated, reason='typing_extensions not installed')
 @pytest.mark.parametrize(
     ['hint_fn', 'value'],
     [
@@ -55,7 +56,6 @@ class M(BaseModel):
         assert get_type_hints(M)['x'] == hint
 
 
-@pytest.mark.skipif(not Annotated, reason='typing_extensions not installed')
 @pytest.mark.parametrize(
     ['hint_fn', 'value', 'subclass_ctx'],
     [
@@ -93,7 +93,6 @@ class M(BaseModel):
             x: hint = value
 
 
-@pytest.mark.skipif(not Annotated, reason='typing_extensions not installed')
 @pytest.mark.parametrize(
     ['hint_fn', 'value', 'empty_init_ctx'],
     [
@@ -121,7 +120,6 @@ class M(BaseModel):
         assert M().x == 5
 
 
-@pytest.mark.skipif(not Annotated, reason='typing_extensions not installed')
 def test_field_reuse():
     field = Field(description='Long description')