expect_int("is_search_tree on tree1", 1, is_search_tree(tree1));


    // Inserare elemente
    tree3=insert_rand(NULL, 3);
    tree3=insert_rand(tree3, 78);
    tree3=insert_rand(tree3, 96);
    tree3=insert_rand(tree3, 5412);
    tree3=insert_rand(tree3, 458);
    expect_int("is_search_tree on tree3", 0, is_search_tree(tree3));