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Last active January 2, 2016 17:29
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AutoFixture strategy for invoking Factory Methods with most parameters based on Twitter discussion on https://twitter.com/madstt/status/420850414641090560
internal class GreedyFactoryMethodQuery : IMethodQuery
{
public IEnumerable<IMethod> SelectMethods(Type type)
{
if (type == null)
throw new ArgumentNullException("type");
return from mi in type.GetMethods(
BindingFlags.Static | BindingFlags.Public)
where mi.ReturnType == type
let parameters = mi.GetParameters()
orderby parameters.Length descending
select new StaticMethod(mi) as IMethod;
}
}
public class ATypeWithFactoryMethods
{
private ATypeWithFactoryMethods()
{
}
public static ATypeWithFactoryMethods Create()
{
return new ATypeWithFactoryMethods();
}
public static ATypeWithFactoryMethods Create(object argument)
{
return new ATypeWithFactoryMethods();
}
}
[Fact]
public void Test()
{
var fixture = new Fixture();
fixture.Customizations.Add(
new MethodInvoker(
new GreedyFactoryMethodQuery()));
var result = fixture.Create<ATypeWithFactoryMethods>();
// -> AutoFixture invokes the static Factory Method with most parameters.
}
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