code: def test_open_s3_text(self):
      access_key_id = os.getenv("AWS_ACCESS_KEY_ID")
      secret_access_key = os.getenv("AWS_SECRET_ACCESS_KEY")
      if access_key_id and secret_access_key:
          file_path = "s3://analytics-zoo-data/hyperseg/trainingData/train_tiled.txt"
          lines = open_text(file_path)
          assert lines[0] == "CONTENTAI_000001"
  
imports: import os.path
  import shutil
  import tempfile
  from zoo.orca.data.file import open_image, open_text, load_numpy, exists, makedirs, write_text
label_desc: Use image node_id 4 for calling the TestFile obj's underlying member method code with example usage: obj.test_open_s3_text() without return types