Update pytest.raises to raise a TypeError when an invalid keyword argument is passed.

_pytest/python_api.py

@@ -597,6 +597,10 @@ def raises(expected_exception, *args, **kwargs):
             message = kwargs.pop("message")
         if "match" in kwargs:
             match_expr = kwargs.pop("match")
+        if len(kwargs.keys()) > 0:
+            msg = 'Unexpected keyword arguments passed to pytest.raises: '
+            msg += ', '.join(kwargs.keys())
+            raise TypeError(msg)
         return RaisesContext(expected_exception, message, match_expr)
     elif isinstance(args[0], str):
         code, = args

changelog/3348.bugfix.rst

@@ -0,0 +1 @@
+Updated `pytest.raises` to raise a TypeError when an invalid keyword argument is passed.

testing/python/raises.py

@@ -61,6 +61,11 @@ class TestRaises(object):
         with pytest.raises(TypeError):
             pytest.raises('wrong', lambda: None)
 
+    def test_invalid_arguments_to_raises(self):
+        with pytest.raises(TypeError, match='unknown'):
+            with pytest.raises(TypeError, unknown='bogus'):
+                raise ValueError()
+
     def test_tuple(self):
         with pytest.raises((KeyError, ValueError)):
             raise KeyError('oops')