public void PropertyObserver_ValueGetter_Observes_instance1_StringProperty_AutoActivateFalse()
{
var instance1 = new NotifyPropertyChangedClass1 {
StringProperty = null
};
var instance2 = new NotifyPropertyChangedClass1();
var callCount = 0;
var value = "Nil";
using var observes = PropertyReferenceObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.StringProperty,
false,
v =>
{
value = v;
callCount++;
});
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual(null, observes.Value);
instance1.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("1", observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", value);
Assert.AreEqual("1", observes.Value);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
instance1.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("3", observes.Value);
instance1.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual(null, observes.Value);
}
public void PropertyObserver_ValueGetter_Observes_instance_StringProperty()
{
var instance = new NotifyPropertyChangedClass1()
{
StringProperty = null
};
var callCount = 0;
var value = "Nil";
using var observes = PropertyReferenceObserver.Observes(() => instance.StringProperty, (v) =>
{
value = v;
callCount++;
});
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual(null, observes.Value);
instance.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("1", observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", value);
Assert.AreEqual("1", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("3", observes.Value);
instance.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual(null, observes.Value);
}
