@Test
public void searchCommonAncestorTest(){

	Assert.assertEquals(node4, CommonAncestorSearch.searchCommonAncestor(root, node3, node5));
	Assert.assertEquals(node6, CommonAncestorSearch.searchCommonAncestor(root, node3, node7));
	
	Assert.assertEquals(root, CommonAncestorSearch.searchCommonAncestor(root, node5, node10));
	
	Assert.assertEquals(node11, CommonAncestorSearch.searchCommonAncestor(root, node10, node12));
	
	Assert.assertEquals(null, CommonAncestorSearch.searchCommonAncestor(node6, node3, node10));
	Assert.assertEquals(null, CommonAncestorSearch.searchCommonAncestor(node6, root, node3));
}