test_that("Large exponents can parse", {
  res <- vroom(I("1e-63,1e-64\n"), delim = ",", col_types = "dd", col_names = FALSE)
  expect_equal(res[[1]], 1e-63)
  expect_equal(res[[2]], 1e-64)
})

test_that("Doubles parse correctly with comma as decimal separator", {
  res <- vroom(I("23,4\n"), delim='\t', altrep=FALSE,
               locale=locale(decimal_mark=','),
               col_types='d', col_names=FALSE)
  expect_equal(res[[1]], 23.4)
  res2 <- vroom(I("23,4\n"), delim='\t', altrep=TRUE,
               locale=locale(decimal_mark=','),
               col_types='d', col_names=FALSE)
  expect_equal(res2[[1]], 23.4)
})

test_that("NA can be a double value", {
  test_vroom(I("x\n1\n2\n"), delim = ",", col_types = "d", na = "1",
    equals = tibble::tibble(x = c(NA_real_, 2)))
})

test_that("NaN values are guessed and parsed as doubles (https://github.com/tidyverse/readr/issues/1277)", {
  test_vroom(I("x\nNaN\n"), delim = ",", col_types = "?",
    equals = tibble::tibble(x = c(NaN)))
})

test_that("Test that values with only a NaN prefix are _not_ parsed as doubles", {
  test_vroom(I("x\nNaNa\n"), delim = ",", col_types = "?",
    equals = tibble::tibble(x = c("NaNa")))
})

test_that("Inf and -Inf values are guessed and parsed as doubles (https://github.com/tidyverse/readr/issues/1283)", {
  test_vroom(I("x\nInf\n-Inf\n+Inf"), delim = ",", col_types = "?",
    equals = tibble::tibble(x = c(Inf, -Inf, Inf)))
})

test_that("Test that values with only a Inf prefix are _not_ parsed as doubles", {
  test_vroom(I("x\nInfa\n-Infb\n+Infc"), delim = ",", col_types = "?",
    equals = tibble::tibble(x = c("Infa", "-Infb", "+Infc")))
})