public async Task SelectAsyncTracksProperly()
{
var tracker = new IdleTracker(System.Threading.SynchronizationContext.Current);
var value = Mutable.Create(0);
var mapped = value.SelectAsync(
2,
tracker,
async v => {
await Task.Delay(20);
return(v + 2);
});
Assert.IsTrue(tracker.Value);
value.Value = 2;
Assert.AreEqual(2, value.Value);
// Mapped should be 2 immediately after setting
Assert.AreEqual(2, mapped.Value);
// Give us a chance to start...
await Task.Delay(10);
Assert.IsFalse(tracker.Value);
// And now let us finish
await Task.Delay(100);
Assert.IsTrue(tracker.Value);
Assert.AreEqual(2, value.Value);
Assert.AreEqual(4, mapped.Value);
}
public void CanConstructMutables()
{
var value = Mutable.Create(42);
var value2 = Mutable.Create("Foo");
Assert.AreEqual(42, value.Value);
Assert.AreEqual("Foo", value2.Value);
}
public void SelectWorksOffSignal()
{
var value = Mutable.Create(42);
var mapped = value.Select(v => (v + 2).ToString());
Assert.AreEqual(42, value.Value);
Assert.AreEqual("44", mapped.Value);
}
public void MutableUpdateWorks()
{
var value = Mutable.Create(0);
Mutable.Update(value, o => o + 1);
Mutable.Update(value, o => o - 3);
Assert.AreEqual(-2, value.Value);
}
public void SelectWorksWithQuerySyntax()
{
var value = Mutable.Create(42);
var mapped = from v in value
let newV = v + 2
select newV.ToString();
Assert.AreEqual(42, value.Value);
Assert.AreEqual("44", mapped.Value);
}
public void MutableUpdateWorksWithCollection()
{
var value = Mutable.Create(new List <int> {
42, 54
});
Mutable.Update(value, (o => o.Concat(new[] { 21, 15 }).ToList()));
CollectionAssert.AreEqual(new[] { 42, 54, 21, 15 }, value.Value);
}
public void SelectManyWorksWithQuerySyntax()
{
var value = Mutable.Create(42);
var sv = Mutable.Create("Foo");
var mapped = from v in value
from s in sv
let newV = s + v.ToString()
select newV;
Assert.AreEqual(42, value.Value);
Assert.AreEqual("Foo42", mapped.Value);
}
public void SelectPropogatesChangesWithQuerySyntax()
{
var value = Mutable.Create(42);
var mapped = from v in value
let newV = v + 2
select newV.ToString();
Assert.AreEqual(42, value.Value);
Assert.AreEqual("44", mapped.Value);
value.Value = 55;
Assert.AreEqual(55, value.Value);
Assert.AreEqual("57", mapped.Value);
}
public void ObservableToSignalPropogatesChanges()
{
var value = Mutable.Create(42);
IObservable <int> obs = value;
var signal = obs.ToSignal(0);
Assert.AreEqual(42, value.Value);
Assert.AreEqual(0, signal.Value);
value.Value = 24;
Assert.AreEqual(24, value.Value);
Assert.AreEqual(24, signal.Value);
}
public void CopyToTracksSignalChanges()
{
var current = Mutable.Create(0);
var value = Mutable.Create(0);
using (var _ = value.CopyTo(current))
{
value.Value = 10;
Assert.AreEqual(10, current.Value);
value.Value = 15;
Assert.AreEqual(15, current.Value);
}
// Shouldn't impact value
value.Value = 20;
Assert.AreEqual(15, current.Value);
}
public void SubscribeAndUpdateTracksSignalChanges()
{
var sum = Mutable.Create(0);
var value = Mutable.Create(0);
using (var _ = value.SubscribeAndUpdate(sum, (o, v) => o + v))
{
value.Value = 10;
Assert.AreEqual(10, sum.Value);
value.Value = 5;
Assert.AreEqual(15, sum.Value);
}
// Shouldn't impact value
value.Value = 20;
Assert.AreEqual(15, sum.Value);
}
public void SignalWherePropogatesCorrectly()
{
var m = Mutable.Create(1);
var s = m.Select(v => 10 * v).Where(v => v < 100);
var s2 = m.Select(v => 10 * v).Where(v => v > 50, 55);
Assert.AreEqual(10, s.Value);
Assert.AreEqual(55, s2.Value);
m.Value = 5;
Assert.AreEqual(50, s.Value);
Assert.AreEqual(55, s2.Value);
m.Value = 25;
Assert.AreEqual(50, s.Value);
Assert.AreEqual(250, s2.Value);
m.Value = 7;
Assert.AreEqual(70, s.Value);
Assert.AreEqual(70, s2.Value);
}
public void CanSubscribeToSignalChanges()
{
int sum = 0;
var value = Mutable.Create(0);
using (var _ = value.Subscribe(v => sum += v))
{
value.Value = 10;
Assert.AreEqual(10, sum);
value.Value = 5;
Assert.AreEqual(15, sum);
}
// Shouldn't impact value
value.Value = 20;
Assert.AreEqual(15, sum);
}
public void SelectManyPropogatesChangesWithQuerySyntax()
{
var value = Mutable.Create(42);
var sv = Mutable.Create("Foo");
var mapped = from v in value
from s in sv
let newV = s + v.ToString()
select newV;
Assert.AreEqual(42, value.Value);
Assert.AreEqual("Foo42", mapped.Value);
value.Value = 55;
sv.Value = "Bar";
Assert.AreEqual(55, value.Value);
Assert.AreEqual("Bar55", mapped.Value);
}
public void SignalCombinePropogatesSuccessfully()
{
var v1 = Mutable.Create(1);
var v2 = Mutable.Create(2L);
var v3 = Mutable.Create(3.0);
var v4 = Mutable.Create("4");
var v5 = Mutable.Create(5);
var signal = Signal.Combine(
v1,
v2,
v3,
v4,
v5,
(a, b, c, d, e) => $"{a},{b},{c:N6},{d},{e}");
Assert.AreEqual("1,2,3.000000,4,5", signal.Value);
v3.Value = 8;
Assert.AreEqual("1,2,8.000000,4,5", signal.Value);
}
public async Task SelectAsyncWorksOffSignal()
{
var value = Mutable.Create(0);
var mapped = value.SelectAsync(
2,
async v => {
await Task.Delay(20);
return(v + 2);
});
value.Value = 2;
Assert.AreEqual(2, value.Value);
// Mapped should be 2 immediately after setting
Assert.AreEqual(2, mapped.Value);
// Mapped should get updated async while this blocks
await Task.Delay(50);
Assert.AreEqual(2, value.Value);
Assert.AreEqual(4, mapped.Value);
}
public void SelectManyWithFiveValuesWorksWithQuerySyntax()
{
var value1 = Mutable.Create(1);
var value2 = Mutable.Create("2");
var value3 = Mutable.Create(3);
var value4 = Mutable.Create(4);
var value5 = Mutable.Create("5");
var mapped = from a in value1
from b in value2
from c in value3
from d in value4
from e in value5
select $"{a}{b}{c}{d}{e}";
Assert.AreEqual("12345", mapped.Value);
value3.Value = 0;
Assert.AreEqual("12045", mapped.Value);
value2.Value = "Foo";
value5.Value = "Bar";
Assert.AreEqual("1Foo04Bar", mapped.Value);
}
public void SignalWhenFiltersProperly()
{
var guard = Mutable.Create(true);
var input = Mutable.Create(0);
var output = input.When(guard);
Assert.AreEqual(0, output.Value);
input.Value = 1;
Assert.AreEqual(1, output.Value);
// Set guard to false will prevent updates
guard.Value = false;
input.Value = 2;
Assert.AreEqual(1, output.Value);
// Set guard to true will update
guard.Value = true;
Assert.AreEqual(2, output.Value);
}