internal static void Register()
{
Arbitrary.Register(new Arbitrary <char> (
Gen.Elements(CharCandidates().ToArray()),
ShrinkChar));
Arbitrary.Register(new Arbitrary <int> (
Gen.ChooseInt(),
x => ShrinkInteger(x).Distinct()));
Arbitrary.Register(new Arbitrary <long> (
Gen.ChooseInt().ToLong(),
x => ShrinkInteger((int)x).Distinct().Select(i => (long)i)));
Arbitrary.Register(new Arbitrary <float> (
Gen.ChooseDouble().ToFloat(),
x => ShrinkDouble(x).Select(d => (float)d)));
Arbitrary.Register(new Arbitrary <double> (
Gen.ChooseDouble(),
ShrinkDouble));
Arbitrary.Register(new Arbitrary <string> (
from a in Arbitrary.Gen <char> ().ArrayOf()
select new string (a),
x => ShrinkEnumerable(x).Select(cs => new string (cs.ToArray()))));
Arbitrary.Register(typeof(Enumerable <>));
Arbitrary.Register(typeof(Array <>));
Arbitrary.Register(typeof(AList <>));
}
/*
## Registering Default Arbitrary Types
## All of the default arbitrary types are registered automatically in the
## static constructor. Most of these types rely on the helper methods,
## which are introduced below. We will discuss the details of each type
## in context of the helper methods.
*/
internal static void Register()
{
/*
### Character Type
###Characters are randomly selected from a predefined set. This
###produces simpler and more readable characters than randomly
###generating ASCII codes.
*/
Arbitrary.Register(new Arbitrary <char> (
Gen.ChooseFrom(CharCandidates().ToArray()),
ShrinkChar));
/*
### Integral Types
###Integral types `int` and `long` use the same helpers to generate
###and shrink the values. The maximum number generated depends on the
###size parameter used by the generators.
*/
Arbitrary.Register(new Arbitrary <int> (
Gen.ChooseInt(),
x => ShrinkInteger(x).Distinct()));
Arbitrary.Register(new Arbitrary <long> (
Gen.ChooseInt().ToLong(),
x => ShrinkInteger((int)x).Distinct().Select(i => (long)i)));
/*
### Floating Point Types
###`float` and `double` types are generated and shrunk with the same
###methods. The results are casted to lower precision when necessary.
*/
Arbitrary.Register(new Arbitrary <float> (
Gen.ChooseDouble().ToFloat(),
x => ShrinkDouble(x).Select(d => (float)d)));
Arbitrary.Register(new Arbitrary <double> (
Gen.ChooseDouble(),
ShrinkDouble));
/*
### Strings
###Strings are arrays of characters, so they can be composed from
###arbitrary characters with appropriate combinators.
*/
Arbitrary.Register(new Arbitrary <string> (
from a in Arbitrary.Gen <char> ().ArrayOf()
select new string (a),
x => ShrinkEnumerable(x).Select(cs => new string (cs.ToArray()))));
/*
### Collection Types
###The arbitrary implementations for collections are generic.
###Therefore, they work with any item type. Their implementation is
###discussed below.
*/
Arbitrary.Register(typeof(Enumerable <>));
Arbitrary.Register(typeof(Array <>));
Arbitrary.Register(typeof(AList <>));
}
private static IEnumerable <IEnumerable <T> > ShrinkOne <T> (IEnumerable <T> e)
{
if (e.None())
{
return(new IEnumerable <T> [0]);
}
var first = e.First();
var rest = e.Skip(1);
return((from x in Arbitrary.Get <T> ().Shrink(first)
select rest.Append(x)).Concat(
from xs in ShrinkOne(e.Skip(1))
select xs.Append(first)));
}
public static Property <T> Choose <T> ()
{
return(ForAll(Arbitrary.Get <T> ()));
}
/*
* The other version of the ForAll method can be called without specifying
* the IArbitrary instance. The method uses the default arbitrary
* implementation that is registered for the given type.
*/
public static Prop <T> ForAll <T> ()
{
return(ForAll(Arbitrary.Get <T> ()));
}