public void Allow_A_Factory_Method_To_Be_Assigned()
{
// arrange
var contextBuilder = new ContextBuilder();
var parser0 = new Parser <string>("base");
var parser1 = new Parser("base1");
var builder0 = new ParserBuilder <string>(contextBuilder, parser0);
var builder1 = new ParserBuilder(contextBuilder, parser1);
// act
builder0.WithFactoryFunction(() => "hi");
builder1.WithFactoryFunction(() => "hi");
// assert
parser0.FactoryFunction().Should().Be("hi");
parser1.FactoryFunction().Should().Be("hi");
}