public void TestAp()
{
var tasks = 0;
var strategy = new SpyTaskStrategy(() => ++ tasks);
var list = new List <int>();
var expected = new List <int> {
3, 2, 1
};
var ff = Future.Now <Func <int, Func <int, Func <int, int> > > >(a => b => c => a + b + c);
var fa = Future.Func(() =>
{
Thread.Sleep(10);
list.Add(1);
return(1);
},
strategy);
var fb = Future.Func(() =>
{
Thread.Sleep(5);
list.Add(2);
return(2);
},
strategy);
var fc = Future.Func(() =>
{
Thread.Sleep(0);
list.Add(3);
return(3);
},
strategy);
Assert.AreEqual(6, Future.Strategy(ff, strategy).Ap(fa).Ap(fb).Ap(fc).Run());
CollectionAssert.AreEqual(expected, list);
Assert.AreEqual(4, tasks);
}
public void TestLinq()
{
Assert.AreEqual(4, (from s in Future.Now("asdf") select s.Length).Run());
// Fails with a type inference error...
Future <int> fn = from s in Future.Now("asdf") from s1 in Future.Now(s.Length) select s1 - 1;
Assert.AreEqual(3, fn.Run());
}
public void TestCoMonadLaws()
{
// CoNow(CoJoin(m)) == m
Assert.AreEqual(Future.Now(1).CoJoin().CoPure().Run(), 1);
// CoJoin(m).Map(CoNow) == m
Assert.AreEqual(Future.Now(1).CoJoin().Map(Future.CoPure).Run(), 1);
// CoJoin(CoJoin(m)) == CoJoin(m).Map(CoJoin)
Assert.AreEqual(
Future.Now(1).CoJoin().CoJoin().Run().Run().Run(),
Future.Now(1).CoJoin().Map(Future.CoJoin).Run().Run().Run());
}
public void TestMonadLaws()
{
Func <int, Future <int> > incr = i => Future.Now(i + 1);
Func <int, Future <string> > str = i => Future.Now(i.ToString());
// Left identity: Now(a).Bind(f) == f(a)
Assert.AreEqual(Future.Now(1).Bind(incr).Run(), incr(1).Run());
// Right identity: m.Bind(Now) == m
Assert.AreEqual(Future.Now(1).Bind(Future.Now).Run(), 1);
// Associativity: m.Bind(f).Bind(g) == m.Bind(x => f(x).Bind(g))
Assert.AreEqual(
Future.Now(1).Bind(incr).Bind(str).Run(),
Future.Now(1).Bind(x => incr(x).Bind(str)).Run());
}
public void TestOrder()
{
var list = new List <int>();
var expected = new List <int> {
1, 2
};
var fa = Future.Func(() =>
{
Thread.Sleep(10);
list.Add(1);
return(1);
});
var fb = Future.Func(() =>
{
list.Add(2);
return(2);
});
CollectionAssert.AreEqual(expected, fa.Bind(a => fb.Bind(b => Future.Now(new List <int> {
a, b
}))).Run());
CollectionAssert.AreEqual(expected, list);
}
public void TestBind()
{
Assert.AreEqual(4, Future.Now("asdf").Bind(s => Future.Now(s.Length)).Run());
Assert.AreEqual(3, Future.Now("asdf").Bind(s => Future.Now(s.Length).Bind(n => Future.Now(n - 1))).Run());
Assert.AreEqual('s', Future.Now("asdf").Bind(s => Future.Now(1).Bind(n => Future.Now(s[n]))).Run());
}
public void TestMap()
{
Assert.AreEqual(4, Future.Now("asdf").Map(s => s.Length).Run());
}
public void TestStrategies()
{
Assert.AreEqual(1, Future.Now(1).Run());
Assert.AreEqual(1, Future.Lazy(new Lazy <int>(() => 1), Strategies.Task).Run());
Assert.AreEqual(1, Future.Lazy(new Lazy <int>(() => 1), Strategies.Id).Run());
}
