public void Update_DoesNothingWithInsufficientElapsedTime() { windowMock.Verify(m => m.Display(), Times.Never); renderManager.Initialize(); renderManager.PostInitialize(); var renderableMock = new Mock <IRenderable>(); renderableMock.Verify(m => m.Draw(It.IsAny <RenderTarget>()), Times.Never); renderManager.AddRenderable(renderableMock.Object); renderManager.Update(0f); windowMock.VerifyAll(); renderableMock.VerifyAll(); }