avoid parallel tests that compete for client port

src/Tests/Unit/ServiceWireTests/SequentialCollection.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace ServiceWireTests
+{
+    [CollectionDefinition("Sequential Collection", DisableParallelization = true)]
+    public class SequentialCollection
+    {
+    }
+}

src/Tests/Unit/ServiceWireTests/TcpTests.cs

@@ -6,6 +6,7 @@
 
 namespace ServiceWireTests
 {
+    [Collection("Sequential Collection")]
     public class TcpTests : IDisposable
     {
         private INetTester _tester;

src/Tests/Unit/ServiceWireTests/TcpZkTests.cs

@@ -19,7 +19,8 @@ public ZkPasswordHash GetPasswordHashSet(string username)
             return _hash;
         }
     }
-
+
+    [Collection("Sequential Collection")]
     public class TcpZkTests : IDisposable
     {
         private INetTester _tester;