public void TestClear() { BottomUpCoverFieldTree <Rect> fieldTree = new BottomUpCoverFieldTree <Rect>(0.3); Rect rect1 = new Rect(new Point(2, 2), new Size(3, 3)); Rect rect2 = new Rect(new Point(-2, 2), new Size(1, 1)); Rect rect3 = new Rect(new Point(3, 2), new Size(1, 2)); Rect rect4 = new Rect(new Point(2, -2), new Size(1, 1)); fieldTree.Add(rect1); fieldTree.Add(rect2); fieldTree.Add(rect3); fieldTree.Add(rect4); fieldTree.Clear(); Assert.AreEqual(fieldTree.IsEmpty(), true); }