public async Task When_Collection_Reset()
{
var SUT = new ComboBox();
try
{
WindowHelper.WindowContent = SUT;
var c = new MyObservableCollection <string>();
c.Add("One");
c.Add("Two");
c.Add("Three");
SUT.ItemsSource = c;
await WindowHelper.WaitForIdle();
Assert.AreEqual(SUT.Items.Count, 3);
using (c.BatchUpdate())
{
c.Add("Four");
c.Add("Five");
}
SUT.IsDropDownOpen = true;
// Items are materialized when the popup is opened
await WindowHelper.WaitForIdle();
Assert.AreEqual(SUT.Items.Count, 5);
Assert.IsNotNull(SUT.ContainerFromItem("One"));
Assert.IsNotNull(SUT.ContainerFromItem("Four"));
Assert.IsNotNull(SUT.ContainerFromItem("Five"));
}
finally
{
SUT.IsDropDownOpen = false;
}
}
public async Task When_Full_Collection_Reset()
{
var SUT = new ComboBox();
SUT.ItemTemplate = new DataTemplate(() => {
var tb = new TextBlock();
tb.SetBinding(TextBlock.TextProperty, new Windows.UI.Xaml.Data.Binding {
Path = "Text"
});
tb.SetBinding(TextBlock.NameProperty, new Windows.UI.Xaml.Data.Binding {
Path = "Text"
});
return(tb);
});
try
{
WindowHelper.WindowContent = SUT;
var c = new MyObservableCollection <ItemModel>();
c.Add(new ItemModel {
Text = "One"
});
c.Add(new ItemModel {
Text = "Two"
});
c.Add(new ItemModel {
Text = "Three"
});
SUT.ItemsSource = c;
await WindowHelper.WaitForIdle();
SUT.IsDropDownOpen = true;
await WindowHelper.WaitForIdle();
SUT.IsDropDownOpen = false;
Assert.AreEqual(SUT.Items.Count, 3);
using (c.BatchUpdate())
{
c.Clear();
c.Add(new ItemModel {
Text = "Five"
});
c.Add(new ItemModel {
Text = "Six"
});
c.Add(new ItemModel {
Text = "Seven"
});
}
SUT.IsDropDownOpen = true;
// Items are materialized when the popup is opened
await WindowHelper.WaitForIdle();
Assert.AreEqual(3, SUT.Items.Count);
Assert.IsNotNull(SUT.ContainerFromItem(c[0]));
Assert.IsNotNull(SUT.ContainerFromItem(c[1]));
Assert.IsNotNull(SUT.ContainerFromItem(c[2]));
Assert.IsNotNull(SUT.FindName("Seven"));
Assert.IsNotNull(SUT.FindName("Five"));
Assert.IsNotNull(SUT.FindName("Six"));
}
finally
{
SUT.IsDropDownOpen = false;
}
}