public void Should_Track_Property_Chain_Breaking_With_Object_Then_Mending()
{
var data = new Class1 {
Next = new Class2 {
Bar = "bar"
}
};
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List <object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 {
Bar = "baz"
};
Assert.Equal(new[] { "bar", PerspexProperty.UnsetValue, "baz" }, result);
sub.Dispose();
Assert.Equal(0, data.SubscriptionCount);
Assert.Equal(0, data.Next.SubscriptionCount);
Assert.Equal(0, breaking.SubscriptionCount);
Assert.Equal(0, old.SubscriptionCount);
}
public void Should_Track_Property_Chain_Breaking_With_Object_Then_Mending()
{
var data = new Class1 {
Next = new Class2 {
Bar = "bar"
}
};
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List <object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 {
Bar = "baz"
};
Assert.Equal(3, result.Count);
Assert.Equal("bar", result[0]);
Assert.IsType <BindingError>(result[1]);
Assert.Equal("baz", result[2]);
sub.Dispose();
Assert.Equal(0, data.SubscriptionCount);
Assert.Equal(0, data.Next.SubscriptionCount);
Assert.Equal(0, breaking.SubscriptionCount);
Assert.Equal(0, old.SubscriptionCount);
}
public void Should_Track_Property_Chain_Breaking_With_Missing_Member_Then_Mending()
{
var data = new Class1 {
Next = new Class2 {
Bar = "bar"
}
};
var target = ExpressionObserver.Create(data, o => (o.Next as Class2).Bar);
var result = new List <object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 {
Bar = "baz"
};
Assert.Equal(
new object[]
{
"bar",
new BindingNotification(
new MissingMemberException("Could not find a matching property accessor for 'Bar' on 'Avalonia.Base.UnitTests.Data.Core.ExpressionObserverTests_Property+WithoutBar'"),
BindingErrorType.Error),
"baz",
},
result);
sub.Dispose();
// Forces WeakEvent compact
Dispatcher.UIThread.RunJobs();
Assert.Equal(0, data.PropertyChangedSubscriptionCount);
Assert.Equal(0, data.Next.PropertyChangedSubscriptionCount);
Assert.Equal(0, breaking.PropertyChangedSubscriptionCount);
Assert.Equal(0, old.PropertyChangedSubscriptionCount);
GC.KeepAlive(data);
}
public void Should_Track_Property_Chain_Breaking_With_Missing_Member_Then_Mending()
{
var data = new Class1 {
Next = new Class2 {
Bar = "bar"
}
};
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List <object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 {
Bar = "baz"
};
Assert.Equal(
new object[]
{
"bar",
new BindingNotification(
new MissingMemberException("Could not find CLR property 'Bar' on 'Avalonia.Markup.UnitTests.Data.ExpressionObserverTests_Property+WithoutBar'"),
BindingErrorType.Error),
"baz",
},
result);
sub.Dispose();
Assert.Equal(0, data.PropertyChangedSubscriptionCount);
Assert.Equal(0, data.Next.PropertyChangedSubscriptionCount);
Assert.Equal(0, breaking.PropertyChangedSubscriptionCount);
Assert.Equal(0, old.PropertyChangedSubscriptionCount);
GC.KeepAlive(data);
}
public void Should_Track_Property_Chain_Breaking_With_Object_Then_Mending()
{
var data = new Class1 { Next = new Class2 { Bar = "bar" } };
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List<object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 { Bar = "baz" };
Assert.Equal(new[] { "bar", PerspexProperty.UnsetValue, "baz" }, result);
sub.Dispose();
Assert.Equal(0, data.SubscriptionCount);
Assert.Equal(0, data.Next.SubscriptionCount);
Assert.Equal(0, breaking.SubscriptionCount);
Assert.Equal(0, old.SubscriptionCount);
}
public void Should_Track_Property_Chain_Breaking_With_Missing_Member_Then_Mending()
{
var data = new Class1 { Next = new Class2 { Bar = "bar" } };
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List<object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 { Bar = "baz" };
Assert.Equal(
new object[]
{
"bar",
new BindingNotification(
new MissingMemberException("Could not find CLR property 'Bar' on 'Avalonia.Markup.UnitTests.Data.ExpressionObserverTests_Property+WithoutBar'"),
BindingErrorType.Error),
"baz",
},
result);
sub.Dispose();
Assert.Equal(0, data.PropertyChangedSubscriptionCount);
Assert.Equal(0, data.Next.PropertyChangedSubscriptionCount);
Assert.Equal(0, breaking.PropertyChangedSubscriptionCount);
Assert.Equal(0, old.PropertyChangedSubscriptionCount);
}
public void Should_Track_Property_Chain_Breaking_With_Object_Then_Mending()
{
var data = new Class1 { Next = new Class2 { Bar = "bar" } };
var target = new ExpressionObserver(data, "Next.Bar");
var result = new List<object>();
var sub = target.Subscribe(x => result.Add(x));
var old = data.Next;
var breaking = new WithoutBar();
data.Next = breaking;
data.Next = new Class2 { Bar = "baz" };
Assert.Equal(3, result.Count);
Assert.Equal("bar", result[0]);
Assert.IsType<BindingError>(result[1]);
Assert.Equal("baz", result[2]);
sub.Dispose();
Assert.Equal(0, data.SubscriptionCount);
Assert.Equal(0, data.Next.SubscriptionCount);
Assert.Equal(0, breaking.SubscriptionCount);
Assert.Equal(0, old.SubscriptionCount);
}
