### lex_density ----
test_that("lex_density works", {
  testdata <- readRDS(system.file("testdata/testdata.rda", package = "gibasa"))
  res <-
    testdata[["tokens"]] |>
    dplyr::filter(as.integer(doc_id) < 5) |>
    prettify(col_select = "POS1") |>
    dplyr::summarise(
      noun_ratio = lex_density(POS1,
        "\u540d\u8a5e",
        c("\u52a9\u8a5e", "\u52a9\u52d5\u8a5e"),
        negate = c(FALSE, TRUE)
      ),
      .by = "doc_id"
    )
  expect_snapshot_value(res, style = "json2", cran = FALSE)
})