code: def test_check_unstaged_changes(self):
      # Setup
      self.__setup()
      environment_obj = self.environment_controller.create({})
      self.environment_ids.append(environment_obj.id)
  
      # 1) After commiting the changes
      # Check for no unstaged changes because already committed
      result = self.environment_controller.check_unstaged_changes()
      assert not result
  
      # Add a new file
      with open(
          os.path.join(
              self.environment_controller.environment_driver.environment_directory_path,
              "test2",
          ),
          "wb",
      ) as f:
          f.write(to_bytes("cool"))
  
      # 2) Not commiting the changes, should error and raise UnstagedChanges
      failed = False
      try:
          self.environment_controller.check_unstaged_changes()
      except UnstagedChanges:
          failed = True
      assert failed
  
      # Remove new file
      os.remove(
          os.path.join(
              self.environment_controller.environment_driver.environment_directory_path,
              "test2",
          )
      )
  
      # 3) Files are the same as before but no new commit, should have no unstaged changes
      result = self.environment_controller.check_unstaged_changes()
      assert not result
  
      # 4) Remove another file, now it is different and should have unstaged changes
      os.remove(
          os.path.join(
              self.environment_controller.environment_driver.environment_directory_path,
              "test",
          )
      )
      failed = False
      try:
          self.environment_controller.check_unstaged_changes()
      except UnstagedChanges:
          failed = True
      assert failed
  
      # 5) Remove the rest of the files, now it is empty and should return as already staged
      os.remove(
          os.path.join(
              self.environment_controller.environment_driver.environment_directory_path,
              "Dockerfile",
          )
      )
      result = self.environment_controller.check_unstaged_changes()
      assert not result
  
imports: import os
  import uuid
  import threading
  import tempfile
  import platform
  import timeout_decorator
  from io import open
  from datmo.config import Config
  from datmo.core.controller.project import ProjectController
  from datmo.core.controller.environment.environment import EnvironmentController
  from datmo.core.entity.environment import Environment
  from datmo.core.util.exceptions import EntityNotFound, RequiredArgumentMissing, TooManyArgumentsFound, FileAlreadyExistsError, UnstagedChanges, EnvironmentDoesNotExist, ProjectNotInitialized
  from datmo.core.util.misc_functions import check_docker_inactive, pytest_docker_environment_failed_instantiation
label_desc: Use image node_id 23 for calling the TestEnvironmentController obj's underlying member method code with example usage: obj.test_check_unstaged_changes() without return types