Completely refactored unit tests, removed unused code

unittests/network_tests.py

@@ -0,0 +1,41 @@
+import random
+import socket
+import threading
+import unittest
+
+from network import TcpTransport, TcpClient
+import network.authenticator
+
+
+def run_server_echo_thread(port):
+    def server_thread():
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            s.bind(('', port))
+            s.listen(1)
+            conn, addr = s.accept()
+            with conn:
+                data = conn.recv(16)
+                conn.send(data)
+
+    server = threading.Thread(target=server_thread)
+    server.start()
+
+
+class NetworkTests(unittest.TestCase):
+    @staticmethod
+    def test_tcp_client():
+        port = random.randint(50000, 60000)  # Arbitrary non-privileged port
+        run_server_echo_thread(port)
+
+        msg = b'Unit testing...'
+        client = TcpClient()
+        client.connect('localhost', port)
+        client.write(msg)
+        assert msg == client.read(16), 'Read message does not equal sent message'
+        client.close()
+
+    @staticmethod
+    def test_authenticator():
+        transport = TcpTransport('149.154.167.91', 443)
+        network.authenticator.do_authentication(transport)
+        transport.close()