Tests: Migrate db/test_transaction.yml to 'assert_type' tests

django-stubs/db/transaction.pyi

@@ -22,7 +22,7 @@ def set_rollback(rollback: bool, using: str | None = ...) -> None: ...
 def mark_for_rollback_on_error(using: str | None = ...) -> Iterator[None]: ...
 def on_commit(func: Callable[[], object], using: str | None = ..., robust: bool = ...) -> None: ...
 
-_C = TypeVar("_C", bound=Callable)  # Any callable
+_C = TypeVar("_C", bound=Callable[..., Any])  # Any callable
 
 # Don't inherit from ContextDecorator, so we can provide a more specific signature for __call__
 class Atomic:

tests/assert_type/db/test_transaction.py

@@ -0,0 +1,33 @@
+from collections.abc import Callable
+from typing import List
+
+from django.db.transaction import atomic, non_atomic_requests
+from django.http import HttpRequest, HttpResponse
+
+
+@atomic
+def func1(x: int) -> List[int]: ...
+
+
+x1: Callable[[int], List[int]] = func1
+
+
+@atomic(using="bla", savepoint=False)
+def func2(x: int) -> List[int]: ...
+
+
+x1 = func2
+
+
+@non_atomic_requests
+def view_func1(request: HttpRequest) -> HttpResponse: ...
+
+
+x2: Callable[[HttpRequest], HttpResponse] = view_func1
+
+
+@non_atomic_requests
+def view_func2(request: HttpRequest, arg: str) -> HttpResponse: ...
+
+
+x3: Callable[[HttpRequest, str], HttpResponse] = view_func2