fixed(raises) for failing test cases

src/_pytest/python_api.py

@@ -1,32 +1,32 @@
 # mypy: allow-untyped-defs
 from __future__ import annotations
 
-from collections.abc import Collection
-from collections.abc import Sized
-from decimal import Decimal
 import math
-from numbers import Complex
 import pprint
 import re
+from collections.abc import Collection, Sized
+from decimal import Decimal
+from numbers import Complex
 from types import TracebackType
-from typing import Any
+from typing import (
-from typing import Callable
+    TYPE_CHECKING,
-from typing import cast
+    Any,
-from typing import ContextManager
+    Callable,
-from typing import final
+    ContextManager,
-from typing import Mapping
+    Mapping,
-from typing import overload
+    Pattern,
-from typing import Pattern
+    Sequence,
-from typing import Sequence
+    Tuple,
-from typing import Tuple
+    Type,
-from typing import Type
+    TypeVar,
-from typing import TYPE_CHECKING
+    cast,
-from typing import TypeVar
+    final,
+    overload,
+)
 
 import _pytest._code
 from _pytest.outcomes import fail
 
-
 if TYPE_CHECKING:
     from numpy import ndarray
 
@@ -1008,7 +1008,7 @@ class RaisesContext(ContextManager[_pytest._code.ExceptionInfo[E]]):
         exc_info = cast(Tuple[Type[E], E, TracebackType], (exc_type, exc_val, exc_tb))
         self.excinfo.fill_unfilled(exc_info)
         try:
-            if self.match_expr:
+            if self.match_expr is not None:
                 self.excinfo.match(self.match_expr)
         except re.error as e:
             fail(f"Invalid regex pattern provided to 'match': {e}")