public void PropertyObserver_OnValueChanged_Observes_instance_StringProperty()
{
var instance = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyReferenceObserver.ObservesOnValueChanged(() => instance.StringProperty);
observes.PropertyChanged += (sender, args) => callCount++;
Assert.AreEqual(0, callCount);
Assert.AreEqual(null, observes.Value);
instance.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual(null, observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
}
public void PropertyObserver_OnValueChanged_Observes_instance_StringProperty_TaskSchedulerCurrent_AutoActivateTrue()
{
var instance = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyReferenceObserver.ObservesOnValueChanged(instance, i => i.StringProperty, TaskScheduler.Current, true);
observes.PropertyChanged += (sender, args) => callCount++;
Assert.AreEqual(0, callCount);
Assert.AreEqual(null, observes.Value);
instance.StringProperty = "1";
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
}
PropertyObserver_OnValueChanged_Observes_instance1_StringProperty_TaskSchedulerCurrent_AutoActivateFalse()
{
var instance1 = new NotifyPropertyChangedClass1();
var instance2 = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyReferenceObserver.ObservesOnValueChanged(
instance1,
instance2,
(i1, i2) => i1.StringProperty,
TaskScheduler.Current,
false);
observes.PropertyChanged += (sender, args) => callCount++;
Assert.AreEqual(0, callCount);
Assert.AreEqual(null, observes.Value);
instance1.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual(null, observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", observes.Value);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance1.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
}