Skip B028 if warnings.warn is called with *args or **kwargs (#501)

* Avoid raising B028 if warnings.warn contains *args or **kwargs

* Update tests/b028.py

Co-authored-by: Cooper Lees <[email protected]>

---------

Co-authored-by: Cooper Lees <[email protected]>

Author: harupy

bugbear.py

@@ -1683,6 +1683,8 @@ def check_for_b028(self, node) -> None:
             and node.func.value.id == "warnings"
             and not any(kw.arg == "stacklevel" for kw in node.keywords)
             and len(node.args) < 3
+            and not any(isinstance(a, ast.Starred) for a in node.args)
+            and not any(kw.arg is None for kw in node.keywords)
         ):
             self.errors.append(B028(node.lineno, node.col_offset))
 

tests/b028.py

@@ -11,3 +11,8 @@
 warnings.warn("test", DeprecationWarning, stacklevel=1)
 warnings.warn("test", DeprecationWarning, 1)
 warnings.warn("test", category=DeprecationWarning, stacklevel=1)
+args = ("test", DeprecationWarning, 1)
+warnings.warn(*args)
+kwargs = {"message": "test", "category": DeprecationWarning, "stacklevel": 1}
+warnings.warn(**kwargs)
+warnings.warn(*args, **kwargs)