for (const auto& status : statuses)
    EXPECT_PRED2(UnimplementedOrReturnsCode, status, Code::OK);
}

TEST_P(ModularFileSystemTest, TestFilesExistAllFailureModes) {
  // if reordering these, make sure to reorder checks at the end
  const std::vector<std::string> filenames = {
      GetURIForPath("a_dir"),
      GetURIForPath("a_file"),
      GetURIForPath("a_file/a_new_file"),
      GetURIForPath("file_not_found"),
  };