code: def test_exists(self):
      # Test failure, not initialized
      failed = False
      try:
          _ = self.code_controller.create()
      except:
          failed = True
      assert failed
  
      # Initialize project and test file
      self.project_controller.init("test5", "test description")
      definition_filepath = os.path.join(
          self.code_controller.home, "test.txt"
      )
      with open(definition_filepath, "wb") as f:
          f.write(to_bytes(str("test")))
      code_obj = self.code_controller.create()
  
      # Check by code id
      result = self.code_controller.exists(code_id=code_obj.id)
      assert result
  
      # Check by code commit id
      result = self.code_controller.exists(
          code_commit_id=code_obj.commit_id
      )
      assert result
  
      # Test with wrong environment id
      result = self.code_controller.exists(code_id="test_wrong_env_id")
      assert not result
  
file_path: datmo/datmo/core/controller/code/tests/test_code.py
imports: import os
  import tempfile
  import platform
  from io import open
  from datmo.config import Config
  from datmo.core.controller.project import ProjectController
  from datmo.core.controller.code.code import CodeController
  from datmo.core.util.exceptions import EntityNotFound, CommitDoesNotExist, CodeDoesNotExist, UnstagedChanges
label_desc: Use image node_id 7 for calling the TestCodeController obj's underlying member method code with example usage: obj.test_exists() without return types