try to fix bug

server.test/UDPServerTest.cs

@@ -1,7 +1,29 @@
-namespace server.test.UDPServer;
+using System.Net;
+using System.Reflection;
+using System.Text;
+using Xunit.Sdk;
 
-public class UnitTest1
+namespace server.test;
+
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+public class UDPServerTest : BeforeAfterTestAttribute
 {
+    const string address = "127.0.0.1";
+    const int port = 1234;
+    private static readonly UDPServer udpServer = new UDPServer(port);
+
+    public override void Before(MethodInfo methodUnderTest)
+    {
+        udpServer.Start();
+        Console.WriteLine("Start UDP Server");
+    }
+
+    public override void After(MethodInfo methodUnderTest)
+    {
+        udpServer.Stop();
+        Console.WriteLine("Stop UDP Server");
+    }
+
     [Fact]
     public void UDPDataDeepClone()
     {
@@ -33,4 +55,35 @@ public class UnitTest1
         Assert.NotEqual(udpData.Data, cloneUdpData.Data);
         Assert.NotEqual(udpData.HasRead, cloneUdpData.HasRead);
     }
+
+    [Theory]
+    [InlineData("Hello World!")]
+    [InlineData("Hello Server!")]
+    public async Task UDPServerFind(string text)
+    {
+        var serverEP = new IPEndPoint(IPAddress.Parse(address), port);
+
+
+
+        Assert.True(UDPClientPool.SendString(serverEP, [text]));
+        {
+            var ret = udpServer.FindData(address);
+            Assert.True(ret.HasValue);
+            var data = ret.Value;
+            Assert.Equal(data.Address, address);
+            Assert.Equal(data.Port, port);
+            Assert.Equal(Encoding.ASCII.GetString(data.Data), text);
+        }
+
+
+        Assert.True(await UDPClientPool.SendStringAsync(serverEP, [text]));
+        {
+            var ret = await udpServer.FindDataAsync(address);
+            Assert.True(ret.HasValue);
+            var data = ret.Value;
+            Assert.Equal(data.Address, address);
+            Assert.Equal(data.Port, port);
+            Assert.Equal(Encoding.ASCII.GetString(data.Data), text);
+        }
+    }
 }

server/src/UdpClientPool.cs

@@ -2,7 +2,7 @@ using System.Net;
 using System.Net.Sockets;
 using System.Text;
 
-class UDPClientPool
+public class UDPClientPool
 {
     private static IPAddress localhost = IPAddress.Parse("127.0.0.1");
 
@@ -13,6 +13,8 @@ class UDPClientPool
         byte[] sendbuf = Encoding.ASCII.GetBytes(stringArray[0]);
 
         var sendLen = socket.SendTo(sendbuf, endPoint);
+        socket.Close();
+
         if (sendLen == stringArray[0].Length) { return true; }
         else { return false; }
     }
@@ -26,6 +28,8 @@ class UDPClientPool
     {
         Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
         var sendLen = socket.SendTo(buf, endPoint);
+        socket.Close();
+
         if (sendLen == buf.Length) { return true; }
         else { return false; }
     }
@@ -40,6 +44,8 @@ class UDPClientPool
         Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
         var sendBytes = pkg.ToBytes();
         var sendLen = socket.SendTo(sendBytes, endPoint);
+        socket.Close();
+
         if (sendLen == sendBytes.Length) { return true; }
         else { return false; }
     }
@@ -54,6 +60,8 @@ class UDPClientPool
         Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
         var sendBytes = pkg.ToBytes();
         var sendLen = socket.SendTo(sendBytes, endPoint);
+        socket.Close();
+
         if (sendLen == sendBytes.Length) { return true; }
         else { return false; }
     }
@@ -71,6 +79,8 @@ class UDPClientPool
         IPEndPoint ep = new IPEndPoint(localhost, port);
 
         var sendLen = socket.SendTo(sendBytes, ep);
+        socket.Close();
+
         if (sendLen == sendBytes.Length) { return true; }
         else { return false; }
     }
@@ -87,5 +97,7 @@ class UDPClientPool
 
             Thread.Sleep(sleepMilliSeconds);
         }
+
+        socket.Close();
     }
 }

server/src/UdpServer.cs

@@ -92,7 +92,7 @@ public class UDPServer
         {
             Console.WriteLine(e.ToString());
             throw new ArgumentException(
-                $"Not currect port num: {port}",
+                $"Failed to set up server with this port: {port}",
                 nameof(port)
                 );
         }
@@ -143,7 +143,7 @@ public class UDPServer
         }
         else
         {
-            return Optional.Some((UDPData)data);
+            return Optional.Some((UDPData)data.DeepClone());
         }
     }
 
@@ -196,7 +196,7 @@ public class UDPServer
         }
         else
         {
-            return Optional.Some((UDPData)data);
+            return Optional.Some((UDPData)data.DeepClone());
         }
     }