Remove spurious pytest.warns() to fix pytest-8 compatibility

Remove the spurious `pytest.warns()` contexts within `pytest.raises()`
in `test_shortcuts`, in order to fix compatibility with pytest-8.0.0.
Prior to this version, the exception raised caused these assertions
to be ignored entirely.  This is fixed in pytest-8.0.0, and the tests
start failing because the warning is never raised prior
to the exception.

Fixes #789

Author: mgorny

tests/unit/test_shortcuts.py

@@ -423,8 +423,7 @@ def test_request_response_error(self, mock_unmarshal, spec_v31):
         mock_unmarshal.return_value = ResultMock(error_to_raise=ValueError)
 
         with pytest.raises(ValueError):
-            with pytest.warns(DeprecationWarning):
-                unmarshal_response(request, response, spec=spec_v31)
+            unmarshal_response(request, response, spec=spec_v31)
 
         mock_unmarshal.assert_called_once_with(request, response)
 
@@ -597,15 +596,13 @@ def test_spec_invalid(self, spec_invalid):
         request = mock.Mock(spec=Request)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_request(request, spec=spec_invalid)
+            validate_request(request, spec=spec_invalid)
 
     def test_spec_not_detected(self, spec_v20):
         request = mock.Mock(spec=Request)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_request(request, spec=spec_v20)
+            validate_request(request, spec=spec_v20)
 
     def test_request_type_invalid(self, spec_v31):
         request = mock.sentinel.request
@@ -733,8 +730,7 @@ def test_webhook_request_validator_not_found(self, spec_v30):
         request = mock.Mock(spec=WebhookRequest)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_request(request, spec=spec_v30)
+            validate_request(request, spec=spec_v30)
 
     @mock.patch(
         "openapi_core.validation.request.validators.V31WebhookRequestValidator."
@@ -889,16 +885,14 @@ def test_spec_not_detected(self, spec_invalid):
         response = mock.Mock(spec=Response)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_response(request, response, spec=spec_invalid)
+            validate_response(request, response, spec=spec_invalid)
 
     def test_spec_not_supported(self, spec_v20):
         request = mock.Mock(spec=Request)
         response = mock.Mock(spec=Response)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_response(request, response, spec=spec_v20)
+            validate_response(request, response, spec=spec_v20)
 
     def test_request_type_invalid(self, spec_v31):
         request = mock.sentinel.request
@@ -965,8 +959,7 @@ def test_webhook_response_validator_not_found(self, spec_v30):
         response = mock.Mock(spec=Response)
 
         with pytest.raises(SpecError):
-            with pytest.warns(DeprecationWarning):
-                validate_response(request, response, spec=spec_v30)
+            validate_response(request, response, spec=spec_v30)
 
     @mock.patch(
         "openapi_core.validation.response.validators.V31WebhookResponseValidator."