code: def test_get_files(self):
      self.__setup()
      # Test failure case
      failed = False
      try:
          self.task_controller.get_files("random")
      except DoesNotExist:
          failed = True
      assert failed
  
      # Create task in the project
      task_obj = self.task_controller.create()
  
      # Create environment definition
      env_def_path = os.path.join(
          self.project_controller.home, "Dockerfile"
      )
      with open(env_def_path, "wb") as f:
          f.write(to_bytes("FROM python:3.5-alpine"))
  
      # Create file to add
      self.project_controller.file_driver.create(
          "dirpath1", directory=True
      )
      self.project_controller.file_driver.create(
          os.path.join("dirpath1", "filepath1")
      )
  
      # Snapshot dictionary
      snapshot_dict = {
          "paths": [
              os.path.join(
                  self.project_controller.home, "dirpath1", "filepath1"
              )
          ],
      }
  
      # Create task_dict
      task_command = ["sh", "-c", "echo accuracy:0.45"]
      task_dict = {"command_list": task_command}
  
      # Test the default values
      updated_task_obj = self.task_controller.run(
          task_obj.id, task_dict=task_dict, snapshot_dict=snapshot_dict
      )
      after_snapshot_obj = self.task_controller.dal.snapshot.get_by_id(
          updated_task_obj.after_snapshot_id
      )
      environment_obj = self.task_controller.dal.environment.get_by_id(
          after_snapshot_obj.environment_id
      )
      self.environment_ids.append(environment_obj.id)
  
      # TODO: Test case for during run and before_snapshot run
      # Get files for the task after run is complete (default)
      result = self.task_controller.get_files(updated_task_obj.id)
  
      after_snapshot_obj = self.task_controller.dal.snapshot.get_by_id(
          updated_task_obj.after_snapshot_id
      )
      file_collection_obj = (
          self.task_controller.dal.file_collection.get_by_id(
              after_snapshot_obj.file_collection_id
          )
      )
  
      file_names = [item.name for item in result]
  
      assert len(result) == 2
      for item in result:
          assert isinstance(item, TextIOWrapper)
          assert item.mode == "r"
      assert (
          os.path.join(
              self.task_controller.home,
              ".datmo",
              "collections",
              file_collection_obj.filehash,
              "task.log",
          )
          in file_names
      )
      assert (
          os.path.join(
              self.task_controller.home,
              ".datmo",
              "collections",
              file_collection_obj.filehash,
              "filepath1",
          )
          in file_names
      )
  
      # Get files for the task after run is complete for different mode
      result = self.task_controller.get_files(
          updated_task_obj.id, mode="a"
      )
  
      assert len(result) == 2
      for item in result:
          assert isinstance(item, TextIOWrapper)
          assert item.mode == "a"
      assert (
          os.path.join(
              self.task_controller.home,
              ".datmo",
              "collections",
              file_collection_obj.filehash,
              "task.log",
          )
          in file_names
      )
      assert (
          os.path.join(
              self.task_controller.home,
              ".datmo",
              "collections",
              file_collection_obj.filehash,
              "filepath1",
          )
          in file_names
      )
  
      self.task_controller.stop(task_obj.id)
  
imports: import os
  import uuid
  import tempfile
  import platform
  from io import open, TextIOWrapper
  from datmo.config import Config
  from datmo.core.controller.project import ProjectController
  from datmo.core.controller.environment.environment import EnvironmentController
  from datmo.core.controller.task import TaskController
  from datmo.core.entity.task import Task
  from datmo.core.util.exceptions import EntityNotFound, TaskRunError, InvalidArgumentType, RequiredArgumentMissing, ProjectNotInitialized, InvalidProjectPath, TooManyArgumentsFound, DoesNotExist
  from datmo.core.util.misc_functions import check_docker_inactive, pytest_docker_environment_failed_instantiation
label_desc: Use image node_id 13 for calling the TestTaskController obj's underlying member method code with example usage: obj.test_get_files() without return types