Listen backlog test failure

[pepone]

This test also failed with a Slow Windows VM, but not clear why this is time sensitive.

icerpc-csharp/tests/IceRpc.Tests/Transports/Tcp/TcpTransportTests.cs

Line 196 in f89327f

Assert.That(connections, Has.Count.LessThanOrEqualTo(25));

This assert seems a bit aleatory, why 25?

 IceRpc.Tests test net8.0 failed with 1 error(s) (26.1s)
    C:\Users\jose\source\repos\icerpc-csharp\tests\IceRpc.Tests\Transports\Tcp\TcpTransportTests.cs(196): error TESTERROR:
      IceRpc:Tests:Transports:Tcp:TcpTransportTests:Configure_server_connection_listen_backlog (676ms): Error Message:   Assert.That(connections, Has.Count.LessThanOrEqualTo(25))
        Expected: property Count less than or equal to 25
        But was:  30

      Stack Trace:
         at IceRpc.Tests.Transports.Tcp.TcpTransportTests.Configure_server_connection_listen_backlog() in C:\Users\jose\source\repos\icerpc-csharp\tests\IceRpc.Tests\Transports\Tcp\TcpTransportTests.cs:line 196
         at IceRpc.Tests.Transports.Tcp.TcpTransportTests.Configure_server_connection_listen_backlog() in C:\Users\jose\source\repos\icerpc-csharp\tests\IceRpc.Tests\Transports\Tcp\TcpTransportTests.cs:line 198
         at NUnit.Framework.Internal.TaskAwaitAdapter.GenericAdapter`1.BlockUntilCompleted()
         at NUnit.Framework.Internal.MessagePumpStrategy.NoMessagePumpStrategy.WaitForCompletion(AwaitAdapter awaiter)
         at NUnit.Framework.Internal.AsyncToSyncAdapter.Await[TResult](Func`1 invoke)
         at NUnit.Framework.Internal.AsyncToSyncAdapter.Await(Func`1 invoke)
         at NUnit.Framework.Internal.Commands.TestMethodCommand.RunTestMethod(TestExecutionContext context)
         at NUnit.Framework.Internal.Commands.TestMethodCommand.Execute(TestExecutionContext context)
         at NUnit.Framework.Internal.Execution.SimpleWorkItem.<>c__DisplayClass3_0.<PerformWork>b__0()
         at NUnit.Framework.Internal.ContextUtils.<>c__DisplayClass1_0`1.<DoIsolated>b__0(Object _)

      1)    at IceRpc.Tests.Transports.Tcp.TcpTransportTests.Configure_server_connection_listen_backlog() in C:\Users\jose\source\repos\icerpc-csharp\tests\IceRpc.Tests\Transports\Tcp\TcpTransportTests.cs:line 196

[pepone]

Testing on Windows shows that most of the time connect fails at the 18th connection, but there is also failures with a few more connections 21, 25, and 30 like in the stack above.

Here the whole point of the test is that TcpListener call Socket.Listen with the ListenBacklog from the TCP options. Accepting a few more connections is just a detail of the Socket implementation which is out of IceRPC control.