public void AppearingOnShellContentChanged()
{
Shell shell = new TestShell();
var item = CreateShellItem(shellContentRoute: ContentRoute, shellSectionRoute: SectionRoute, shellItemRoute: ItemRoute);
var section = item.SearchForRoute <ShellSection>(SectionRoute);
var content = new ShellContent();
section.Items.Insert(0, content);
section.CurrentItem = content;
shell.Items.Add(item);
ShellLifeCycleState state = new ShellLifeCycleState(shell);
state.AllFalse();
Assert.AreEqual(content, section.CurrentItem);
section.CurrentItem = shell.SearchForRoute <ShellContent>(ContentRoute);
Assert.IsTrue(state.ContentAppearing);
section.CurrentItem = content;
Assert.IsFalse(state.ContentAppearing);
}