public void TestContentRestoreOnDispose()
{
AddAssert("not visible", () => !overlay.IsPresent);
AddStep("show", () => overlay.Show());
AddUntilStep("wait for content dim", () => dimContent.Colour != Color4.White);
AddStep("expire", () => overlay.Expire());
AddUntilStep("wait for content restore", () => dimContent.Colour == Color4.White);
}