code: def test_a85_padding(self):
      eq = self.assertEqual
  
      eq(base64.a85encode(b"x", pad=True), b"GQ7^D")
      eq(base64.a85encode(b"xx", pad=True), b"G^'2g")
      eq(base64.a85encode(b"xxx", pad=True), b"G^+H5")
      eq(base64.a85encode(b"xxxx", pad=True), b"G^+IX")
      eq(base64.a85encode(b"xxxxx", pad=True), b"G^+IXGQ7^D")
  
      eq(base64.a85decode(b"GQ7^D"), b"x\x00\x00\x00")
      eq(base64.a85decode(b"G^'2g"), b"xx\x00\x00")
      eq(base64.a85decode(b"G^+H5"), b"xxx\x00")
      eq(base64.a85decode(b"G^+IX"), b"xxxx")
      eq(base64.a85decode(b"G^+IXGQ7^D"), b"xxxxx\x00\x00\x00")
  
imports: import unittest
  import base64
  import binascii
  import os
  from array import array
  from test.support import os_helper
  from test.support import script_helper
label_desc: Use image node_id 25 for calling the BaseXYTestCase obj's underlying member method code with example usage: obj.test_a85_padding() without return types