test: fix transport unit test

Signed-off-by: Timo Glastra <timo@animo.id>

Author: TimoGlastra

aries_cloudagent/transport/inbound/tests/test_http_transport.py

@@ -119,13 +119,15 @@ async def test_send_message_outliers(self):
             mock_session.return_value = async_mock.MagicMock(
                 receive=async_mock.CoroutineMock(
                     return_value=async_mock.MagicMock(
-                        receipt=async_mock.MagicMock(direct_response_requested=True)
+                        receipt=async_mock.MagicMock(direct_response_requested=True),
+                        wait_processing_complete=async_mock.CoroutineMock(),
                     )
                 ),
                 can_respond=True,
                 profile=InMemoryProfile.test_profile(),
                 clear_response=async_mock.MagicMock(),
                 wait_response=async_mock.CoroutineMock(return_value=b"Hello world"),
+                response_buffer="something",
             )
             async with self.client.post("/", data=test_message) as resp:
                 result = await resp.text()