public void OneTimeSetUp()
{
_manager.Launch(_sourceFile);
var tabView = _manager.Window?.FindTabView();
Assume.That(tabView, Is.Not.Null);
_tab = tabView !.FindFirstDescendant(x => x.ByClassName(nameof(EditorTab))).AsTabItem();
Assume.That(_tab, Is.Not.Null, "Editor tab not automatically shown");
var scintilla = _tab.FindFirstDescendant("Editor").AsScintilla();
Assume.That(scintilla, Is.Not.Null);
_editor = scintilla !;
_originalCode = _editor.Text;
Assume.That(_originalCode, Is.Not.Empty);
}