code: def test_exists_file(self):
      self.project_controller.init("test6", "test description")
  
      paths = self.__setup()
  
      file_collection_obj = self.file_collection_controller.create(
          paths
      )
  
      # check for file_collection_id
      result = self.file_collection_controller.exists(
          file_collection_id=file_collection_obj.id
      )
      assert result
  
      # check for file_hash in file_collection
      result = self.file_collection_controller.exists(
          file_hash=file_collection_obj.filehash
      )
      assert result
  
      # check for not proper file_collection_id
      result = self.file_collection_controller.exists(
          file_collection_id="test_file_collection_id"
      )
      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 8 for calling the TestFileCollectionController obj's underlying member method code with example usage: obj.test_exists_file() without return types