add RFC1459 4.1.2 Nick message

src/server.py

@@ -24,6 +24,14 @@ class Handler_TCPServer(socketserver.BaseRequestHandler):
     def command_pass(self, param):
         return param == self.password
 
+    def command_nickname(self, nickname):
+        if nickname not in self.user_list:
+            self.user_list.append(nickname)
+            return True
+        else:
+            return False
+
+
 
 if __name__ == "__main__":
     HOST, PORT = "localhost", 9999

test/test_server.py

@@ -1,5 +1,9 @@
 """
-    tests the server functionality
+    file: test_server.py
+
+    adds server functionality-tests for pytest
+
+    date: 11.07.2019
 """
 import pytest
 
@@ -12,3 +16,23 @@ def test_ping(server):
 def test_command_pass(server, test_input, expected):
     server.password = "password"
     assert server.command_pass(server, test_input) == expected
+
+
+def create_user_list():
+    user_list = list()
+    user_id = "user"
+    for i in range(0, 9):
+        user_list.append((user_id + str(i)))
+
+    return user_list
+
+
+@pytest.mark.parametrize("user_list, nickname, expected_result",
+                         [
+                             (create_user_list(), "wayne", True),
+                             (create_user_list(), "user2", False),
+                             (create_user_list(), "christoph", True),
+                             (create_user_list(), "user19", True)])
+def test_change_nickname(server, user_list, nickname, expected_result):
+    server.user_list = create_user_list()
+    assert server.command_nickname(server, nickname) == expected_result