code: def test_check_unstaged_changes(self):
      self.project_controller.init("test9", "test description")
  
      # Create the files in the project files directory
      paths = self.__setup()
  
      # Test when there are unstaged changes
      failed = False
      try:
          _ = self.file_collection_controller.check_unstaged_changes()
      except UnstagedChanges:
          failed = True
      assert failed
  
      # Save the file collection
      self.file_collection_controller.create(paths)
  
      # Test when there are no unstaged changes
      result = self.file_collection_controller.check_unstaged_changes()
      assert not result
  
      # Change the file contents
      with open(paths[0], "wb") as f:
          f.write(to_bytes("hello"))
  
      # Test when there are unstaged changes again
      failed = False
      try:
          _ = self.file_collection_controller.check_unstaged_changes()
      except UnstagedChanges:
          failed = True
      assert failed
  
      # Test when there are no files (should be staged)
      os.remove(paths[0])
      shutil.rmtree(paths[1])
      result = self.file_collection_controller.check_unstaged_changes()
      assert not result
  
imports: import os
  import shutil
  import tempfile
  import platform
  from io import open
  from datmo.config import Config
  from datmo.core.controller.project import ProjectController
  from datmo.core.controller.file.file_collection import FileCollectionController
  from datmo.core.util.exceptions import EntityNotFound, UnstagedChanges
label_desc: Use image node_id 11 for calling the TestFileCollectionController obj's underlying member method code with example usage: obj.test_check_unstaged_changes() without return types