code: def test_unzip(self):
      with testing_utils.tempdir() as tmpdir:
          import zipfile
  
          zname = os.path.join(tmpdir, "test.zip")
          with zipfile.ZipFile(zname, "w") as zf:
              with zf.open("test1.txt", "w") as f:
                  f.write(b"Test1\n")
              with zf.open("test2.txt", "w") as f:
                  f.write(b"Test2\n")
  
          build_data._unzip(tmpdir, "test.zip")
          assert os.path.exists(os.path.join(tmpdir, "test1.txt"))
          assert os.path.exists(os.path.join(tmpdir, "test2.txt"))
          with open(os.path.join(tmpdir, "test1.txt")) as f:
              assert f.read() == "Test1\n"
          with open(os.path.join(tmpdir, "test2.txt")) as f:
              assert f.read() == "Test2\n"
          assert not os.path.exists(zname)
  
imports: import os
  import pytest
  from parlai.core import build_data
  import unittest
  import unittest.mock
  import requests
  import parlai.utils.testing
  import multiprocessing
  from parlai.utils.io import PathManager
  from parlai.core.params import ParlaiParser
label_desc: Use image node_id 2 for calling the TestUnzip obj's underlying member method code with example usage: obj.test_unzip() without return types