import os
import os.path
import pathlib
import shutil

def realpath(p):
    return str(pathlib.Path(p).resolve())

#from os.path import realpath

def test_recursion(depth):
    print('depth =', depth)
    old_path = os.getcwd()
    os.mkdir('testdir')
    try:
        abspath = os.path.abspath('testdir')
        for i in range(depth):
            print('symlink', '/'.join(['%d' % i] * 2), '->', 'testdir/%d' % (i + 1))
            os.symlink('/'.join(['%d' % i] * 2), 'testdir/%d' % (i + 1))
        print('symlink', '.', '->', 'testdir/0')
        os.symlink('.', 'testdir/0')
        print('resolve', 'testdir/%d' % depth)
        assert realpath('testdir/%d' % depth) == abspath, '%r != %r' % (realpath('testdir/%d' % depth), abspath)
    finally:
        os.chdir(old_path)
        shutil.rmtree('testdir')

test_recursion(1)
test_recursion(2)
test_recursion(3)
test_recursion(100)