public void AutoCompleteBox_TextChanged_ShouldFilterDropDown()
{
IList <string> items = new List <string>
{
"AnItem",
"OtherItem"
};
AutoCompleteBox autoCompleteBox = new AutoCompleteBox();
autoCompleteBox.ItemsSource = items;
TestSetup.AttachVisualChild(autoCompleteBox);
(autoCompleteBox.GetTemplateChild("Text") as TextBox).Text = "an";
TestSetup.SleepWhile(() => !autoCompleteBox.IsDropDownOpen,
"DropDown is not open after text change");
autoCompleteBox.ItemContainerGenerator.ContainerFromItem("AnItem")
.As <SelectorItem>()
.Visibility
.Should()
.Be(Visibility.Visible);
autoCompleteBox.ItemContainerGenerator.ContainerFromItem("OtherItem")
.As <SelectorItem>()
.Visibility
.Should()
.Be(Visibility.Collapsed);
}