def find_second_max(array):
    if array and len(array) > 0:
        array.sort()
        my_max = array[0]
        my_second_max = None
        for i in array:
            if i > my_max:
                my_second_max = my_max
                my_max = i
            elif i < my_max:
                if my_second_max is None:
                    my_second_max = i
            else:
                if i > my_max:
                    my_second_max = i

        return my_second_max
    return None


#################################################
def verifier(test_name, actual, expected):
    print(test_name)
    if actual != expected:
        print("=======> FAILED! <=======")
        print(f"Got value <{actual}>")
        print(f"Expected value is <{expected}>")
    else:
        print("PASSED")
    print()


second_max_tests = [([1, 6, 3, 6, 54, 3, 6, 3, 1, 2, 8], 8),
                    ([2, 2, 2, 2, 2, 2, 2, 2, 2], None),
                    ([2, 2, 2, 2, 2, 2, 2, 2, 4], 2),
                    ([], None),
                    ([1, 0, -1], 0),
                    ([4, -7, 6, 23, -5, 23, -4, 5, 7, 100], 23)]

for i in range(len(second_max_tests)):
    verifier(f"Second max test {i+1}", find_second_max(second_max_tests[i][0]), second_max_tests[i][1])