test_that("clean_authors() works", {
  author_list <-
    c(
      "Haddaway, N.R., A. Feirman, M.J. Grainger, C.T. Gray, E. Tanriver-Ayder, S. Dhaubanjar, & M.J Westgate",
      "Grames, E.M., A.N. Stillman, M.W. Tingley AND C.S. Elphick"
    )
  author_list |>
    clean_authors()
  expect_false(any(grepl("&", clean_authors(author_list))))
  expect_false(any(grepl("AND", clean_authors(author_list))))
})


test_that("clean_colnames() works", {
  cleaned <- tibble::tibble(".title..." = 1,
                            "X..YEAR" = 2,
                            "authors.." = 3,
                            ".AUTHOR" = 4) |>
    clean_colnames() |>
    colnames()
  expect_false(any(grepl("[[:punct::]]", cleaned)))
  expect_false(any(duplicated(cleaned)))
  expect_false(any(grepl("^(X|Y|Z)\\.+", cleaned)))
})

test_that("clean_df() cleans authors, colnames and factors", {
  test_df <- tibble::tibble(
    authors = c("Haddaway, N.R., A. Feirman AND M.J. Grainger", "Some authors"),
    "..misc." = c("text", "text2"),
    JOURNAL = as.factor(c("A journal", "Another journal"))
  )
  result <- clean_df(test_df)
  expect_equal(colnames(result),
               c("author", "misc", "journal"))
  expect_false(any(grepl("AND", result$author)))
  test_cols <- colnames(result)
  expect_false(any(grepl("[[:punct::]]", test_cols)))
  expect_equal(tolower(test_cols), test_cols)
  expect_false(any(unlist(lapply(result, is.factor))))
})