Refactored project structure, added multithreaded echo server and prime checking server, updated tests.

echo_server_test.py

@@ -0,0 +1,55 @@
+import socket
+import time
+
+def test_echo_server(host='localhost', port=40000, message="Hello, Echo Server!"):
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        try:
+            s.connect((host, port))
+            print(f"Connected to {host}:{port}")
+            
+            # Send the message
+            print(f"Sending message of length: {len(message)}")
+            s.sendall(message.encode())
+            s.shutdown(socket.SHUT_WR)
+
+
+            # Receive the response in chunks
+            chunks = []
+            bytes_received = 0
+            while bytes_received < len(message):
+                chunk = s.recv(1024)
+                if not chunk:
+                    break
+                chunks.append(chunk)
+                bytes_received += len(chunk)
+                time.sleep(0.1)  # Match the server's Sleep(100)
+            
+            response = b''.join(chunks).decode()
+            print(f"Received {len(response)} bytes")
+            
+            # Check if it's a true echo
+            if response == message:
+                print("SUCCESS: Received message matches sent message!")
+            else:
+                print("FAILURE: Received message differs from sent message!")
+                if len(response) != len(message):
+                    print(f"Length mismatch: sent {len(message)}, received {len(response)}")
+                
+        except ConnectionRefusedError:
+            print("Connection failed! Make sure the server is running.")
+        except Exception as e:
+            print(f"An error occurred: {e}")
+
+if __name__ == "__main__":
+    # Test with a simple message
+    test_echo_server()
+    
+    # Test with a longer message
+    test_echo_server(message="This is a longer message to test the echo server's ability to handle larger strings!")
+    
+    # Test with special characters
+    test_echo_server(message="Special chars: !@#$%^&*()")
+    
+    # Test with a large message
+    large_message = "X" * 10000  # 10KB of data
+    test_echo_server(message=large_message)