testValidAVLSimple2() creates a tree with 3 nodes, with the value 3 as root, 2 as left child and 1 as right child and is therefore not a valid tree, because the right value is smaller than its parent. Wrongly, however, it is considered correct in the test
-> not a valid tree because the right value must be equal or bigger?
testValidAVLSimple2() creates a tree with 3 nodes, with the value 3 as root, 2 as left child and 1 as right child and is therefore not a valid tree, because the right value is smaller than its parent. Wrongly, however, it is considered correct in the test -> not a valid tree because the right value must be equal or bigger?