code: def test_view_brancher(tmp_dir, scm, dvc):
      tmp_dir.dvc_gen({"foo": "foo"}, commit="init")
      index = Index.from_repo(dvc)
  
      for _ in dvc.brancher(revs=["HEAD"]):
          view = index.targets_view("foo")
          data = view.data["repo"]
          assert data[("foo",)]
  
imports: import os
  from itertools import chain
  import pytest
  from pygtrie import Trie
  from dvc.repo.index import Index
  from dvc.stage import Stage
label_desc: Use image node_id 14 for calling a global function with example usage: test_view_brancher(tmp_dir, scm, dvc) without return types