code: def test_open(self, tmp_dir, dvc, remote):
      tmp_dir.dvc_gen(
          {
              "foo": "foo-text",
              "dir": {"bar": "bar-text"},
          }
      )
      dvc.push()
  
      # Remove cache to force download
      remove(dvc.cache.local.path)
  
      with api.open("foo") as fobj:
          assert fobj.read() == "foo-text"
  
      with api.open("dir/bar") as fobj:
          assert fobj.read() == "bar-text"
  
file_path: dvc/dvc/testing/api_tests.py
imports: import pytest
  from dvc import api
  from dvc.api import DVCFileSystem
  from dvc.utils.fs import remove
label_desc: Use image node_id 2 for calling the TestAPI obj's underlying member method code with example usage: obj.test_open(tmp_dir, dvc, remote) without return types