public void Allow_Single_Value_Switches()
{
// arrange
var contextBuilder = new ContextBuilder();
var parser0 = new Parser <string>("base");
var builder0 = new ParserBuilder <string>(contextBuilder, parser0);
var parser1 = new Parser("base");
var builder1 = new ParserBuilder(contextBuilder, parser1);
// act
builder0.WithSingleValueSwitch('h', "help", (o, s) => { });
builder1.WithSingleValueSwitch('h', "help", (o, s) => { });
// assert
builder0.Parser.Parameters.Single().Should().BeAssignableTo <SingleValueSwitch <string> >();
builder1.Parser.Parameters.Single().Should().BeAssignableTo <SingleValueSwitch>();
}