Rework (#36)

CliFx.Tests/TestCommands/BrokenEnumerableCommand.cs

@@ -0,0 +1,15 @@
+using System.Threading.Tasks;
+using CliFx.Attributes;
+using CliFx.Tests.TestCustomTypes;
+
+namespace CliFx.Tests.TestCommands
+{
+    [Command]
+    public class BrokenEnumerableCommand : ICommand
+    {
+        [CommandParameter(0)]
+        public TestCustomEnumerable<string>? Test { get; set; }
+
+        public ValueTask ExecuteAsync(IConsole console) => default;
+    }
+}