public void When_attempting_to_register_a_handler_for_an_implemented_handler_it_throws()
{
using var csharpKernel = new CSharpKernel();
Action register = () =>
csharpKernel.RegisterCommandHandler <SubmitCode>((_, _) => Task.CompletedTask);
register.Should()
.Throw <InvalidOperationException>()
.Which
.Message
.Should()
.Be($"Command {typeof(SubmitCode)} is already directly implemented and registration of an alternative handler is not supported.");
}
