@Test
public void testMaxDepth3() {
TreeNode n0 = new TreeNode(0);
TreeNode n1 = new TreeNode(1);
n0.left = n1;
int result = s.maxDepth(n0);
assertTrue(result == 2);
}
@Test
public void thisAlwaysPasses() {
Solution sol = new Solution();
TreeNode root = new TreeNode(3);
root.left = new TreeNode(1);
root.right = new TreeNode(5);
root.left.right = new TreeNode(2);
assertTrue(sol.isBalanced(root));
}