mutex_lock graph_lock(g->mu);

    const int first_new_node_id = g->graph.num_node_ids();

    string prefix_cmp;
    const char* child_scope_name;
    if (prefix == nullptr) {
      child_scope_name = "gradients";
    } else {
      prefix_cmp = string(prefix) + "/";
      // The operation should fail if the provided name prefix has already been
      // used in this graph

                                                      "a_dir", "another_dir"};
  EXPECT_EQ(children.size(), filenames.size() + dirnames.size());
  for (const auto& child : expected_children)
    EXPECT_NE(std::find(children.begin(), children.end(), child),
              children.end());
}

TEST_P(ModularFileSystemTest, TestGetChildrenEmpty) {
  const std::string dirpath = GetURIForPath("dir");