Add new websocket class HttpWebSocket

This class acts as a glue between websocket and http functionality by
taking a 'request_handler' and using its functions for send_response(),
send_header() and end_headers().

tests/test_websocketserver.py

@@ -0,0 +1,69 @@
+
+""" Unit tests for websocketserver """
+import unittest
+from unittest.mock import patch, MagicMock
+
+from websockify.websocketserver import HttpWebSocket
+
+
+class HttpWebSocketTest(unittest.TestCase):
+    @patch("websockify.websocketserver.WebSocket.__init__", autospec=True)
+    def test_constructor(self, websock):
+        # Given
+        req_obj = MagicMock()
+
+        # When
+        sock = HttpWebSocket(req_obj)
+
+        # Then
+        websock.assert_called_once_with(sock)
+        self.assertEqual(sock.request_handler, req_obj)
+
+    @patch("websockify.websocketserver.WebSocket.__init__", MagicMock(autospec=True))
+    def test_send_response(self):
+        # Given
+        req_obj = MagicMock()
+        sock = HttpWebSocket(req_obj)
+
+        # When
+        sock.send_response(200, "message")
+
+        # Then
+        req_obj.send_response.assert_called_once_with(200, "message")
+
+    @patch("websockify.websocketserver.WebSocket.__init__", MagicMock(autospec=True))
+    def test_send_response_default_message(self):
+        # Given
+        req_obj = MagicMock()
+        sock = HttpWebSocket(req_obj)
+
+        # When
+        sock.send_response(200)
+
+        # Then
+        req_obj.send_response.assert_called_once_with(200, None)
+
+    @patch("websockify.websocketserver.WebSocket.__init__", MagicMock(autospec=True))
+    def test_send_header(self):
+        # Given
+        req_obj = MagicMock()
+        sock = HttpWebSocket(req_obj)
+
+        # When
+        sock.send_header("keyword", "value")
+
+        # Then
+        req_obj.send_header.assert_called_once_with("keyword", "value")
+
+    @patch("websockify.websocketserver.WebSocket.__init__", MagicMock(autospec=True))
+    def test_end_headers(self):
+        # Given
+        req_obj = MagicMock()
+        sock = HttpWebSocket(req_obj)
+
+        # When
+        sock.end_headers()
+
+        # Then
+        req_obj.end_headers.assert_called_once_with()
+