Axsuarez/streaming receive loop unittest (#1667)

* payload receiver unit test

* StreamingRequestHandler test listen

Author: axelsrz

libraries/botbuilder-core/tests/streaming/test_streaming_request_handler.py

@@ -0,0 +1,55 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+from unittest.mock import Mock
+from typing import Any
+
+import aiounittest
+
+from botbuilder.core.streaming import StreamingRequestHandler
+from botbuilder.streaming.transport.web_socket import (
+    WebSocket,
+    WebSocketState,
+    WebSocketCloseStatus,
+    WebSocketMessage,
+    WebSocketMessageType,
+)
+
+
+class MockWebSocket(WebSocket):
+    def __init__(self):
+        super(MockWebSocket, self).__init__()
+
+        self.receive_called = False
+
+    def dispose(self):
+        return
+
+    async def close(self, close_status: WebSocketCloseStatus, status_description: str):
+        return
+
+    async def receive(self) -> WebSocketMessage:
+        self.receive_called = True
+
+    async def send(
+        self, buffer: Any, message_type: WebSocketMessageType, end_of_message: bool
+    ):
+        raise Exception
+
+    @property
+    def status(self) -> WebSocketState:
+        return WebSocketState.OPEN
+
+
+class TestStramingRequestHandler(aiounittest.AsyncTestCase):
+    async def test_listen(self):
+        mock_bot = Mock()
+        mock_activity_processor = Mock()
+        mock_web_socket = MockWebSocket()
+
+        sut = StreamingRequestHandler(
+            mock_bot, mock_activity_processor, mock_web_socket
+        )
+        await sut.listen()
+
+        assert mock_web_socket.receive_called