test_that("seq.Date", {
  expect_error(
    dtt_seq(NA_Date_[-1], NA_Date_[-1]),
    "`from` must be a date",
    class = "chk_error"
  )
  expect_error(
    dtt_seq(NA_Date_, NA_Date_[-1]),
    "`from` must be a date",
    class = "chk_error"
  )
  expect_error(
    dtt_seq(as.Date("2001-01-01"), NA_Date_[-1]),
    "`to` must be a date",
    class = "chk_error"
  )
  expect_error(
    dtt_seq(as.Date("2001-01-01"), NA_Date_),
    "`to` must be a date",
    class = "chk_error"
  )
  expect_error(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-01-01"), units = "hours"),
    "`units` must match 'days', 'months' or 'years'",
    class = "chk_error"
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), length_out = 0L),
    as.Date("2001-01-01")[-1]
  )
  expect_identical(
    dtt_seq(as.Date("2001-01-01")),
    as.Date("2001-01-01")
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), length_out = 2L),
    as.Date(c("2001-01-01", "2001-01-02"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), length_out = -2L),
    as.Date(c("2001-01-01", "2000-12-31"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-01-01")),
    as.Date("2001-01-01")
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-01-03")),
    as.Date(c("2001-01-01", "2001-01-02", "2001-01-03"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-03"), as.Date("2001-01-01")),
    as.Date(c("2001-01-03", "2001-01-02", "2001-01-01"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-01-03"), units = "months"),
    as.Date("2001-01-01")
  )
  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-03-03"), units = "months"),
    as.Date(c("2001-01-01", "2001-02-01", "2001-03-01"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2001-01-03"), units = "years"),
    as.Date("2001-01-01")
  )
  expect_identical(
    dtt_seq(as.Date("2001-01-01"), as.Date("2003-03-03"), units = "years"),
    as.Date(c("2001-01-01", "2002-01-01", "2003-01-01"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-01-02"), as.Date("2003-03-01"), units = "years"),
    as.Date(c("2001-01-01", "2002-01-01", "2003-01-01"))
  )

  expect_identical(
    dtt_seq(as.Date("2001-12-13"), as.Date("2003-12-31"), units = "years"),
    as.Date(c("2001-01-01", "2002-01-01", "2003-01-01"))
  )

  expect_identical(
    length(
      dtt_seq(as.Date("2001-12-31"), as.Date("2002-12-31"), units = "months")
    ),
    13L
  )

  expect_identical(
    length(
      dtt_seq(as.Date("2001-12-31"), as.Date("2002-12-31"), units = "days")
    ),
    366L
  )
})

test_that("seq.POSIXct", {
  expect_error(dtt_seq(NA_POSIXct_[-1], NA_POSIXct_[-1]), class = "chk_error")
  expect_error(dtt_seq(NA_POSIXct_, NA_POSIXct_[-1]), class = "chk_error")
  expect_error(
    dtt_seq(as.POSIXct("2001-01-01"), NA_POSIXct_[-1]),
    class = "chk_error"
  )
  expect_error(
    dtt_seq(as.POSIXct("2001-01-01"), NA_POSIXct_),
    class = "chk_error"
  )
  expect_error(
    dtt_seq(as.POSIXct("2001-01-01"), as.POSIXct("2001-01-01"), units = "hour"),
    paste0(
      "`units` must match 'days', 'hours', 'minutes', 'months', ",
      "'seconds' or 'years', not 'hour'"
    ),
    class = "chk_error"
  )

  expect_error(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "GMT"),
      as.POSIXct("2001-01-01", tz = "UTC")
    ),
    class = "chk_error"
  )

  expect_identical(
    dtt_seq(as.POSIXct("2001-01-01", tz = "UTC"), length_out = 0L),
    as.POSIXct(c("2001-01-01 00:00:00"), tz = "UTC")[-1]
  )

  expect_identical(
    dtt_seq(as.POSIXct("2001-01-01", tz = "UTC"), length_out = 2L),
    as.POSIXct(c("2001-01-01 00:00:00", "2001-01-01 00:00:01"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(as.POSIXct("2001-01-01", tz = "UTC"), length_out = -2L),
    as.POSIXct(c("2001-01-01 00:00:00", "2000-12-31 23:59:59"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2001-01-01", tz = "UTC")
    ),
    as.POSIXct("2001-01-01 00:00:00", tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2001-01-03", tz = "UTC"),
      units = "days"
    ),
    as.POSIXct(c("2001-01-01", "2001-01-02", "2001-01-03"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-03", tz = "UTC"),
      as.POSIXct("2001-01-01", tz = "UTC"),
      units = "days"
    ),
    as.POSIXct(c("2001-01-03", "2001-01-02", "2001-01-01"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2001-01-03", tz = "UTC"),
      units = "months"
    ),
    as.POSIXct("2001-01-01", tz = "UTC")
  )
  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2001-03-03", tz = "UTC"),
      units = "months"
    ),
    as.POSIXct(c("2001-01-01", "2001-02-01", "2001-03-01"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2001-01-03", tz = "UTC"),
      units = "years"
    ),
    as.POSIXct("2001-01-01", tz = "UTC")
  )
  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-01", tz = "UTC"),
      as.POSIXct("2003-03-03", tz = "UTC"),
      units = "years"
    ),
    as.POSIXct(c("2001-01-01", "2002-01-01", "2003-01-01"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-01-02", tz = "UTC"),
      as.POSIXct("2003-03-01", tz = "UTC"),
      units = "years"
    ),
    as.POSIXct(c("2001-01-01", "2002-01-01", "2003-01-01"), tz = "UTC")
  )

  expect_identical(
    dtt_seq(
      as.POSIXct("2001-12-13", tz = "UTC"),
      as.POSIXct("2003-12-31", tz = "UTC"),
      units = "years"
    ),
    as.POSIXct(c("2001-01-01", "2002-01-01", "2003-01-01"), tz = "UTC")
  )

  expect_identical(
    length(
      dtt_seq(
        as.POSIXct("2001-12-31", tz = "UTC"),
        as.POSIXct("2002-12-31", tz = "UTC"),
        units = "months"
      )
    ),
    13L
  )

  expect_identical(
    length(
      dtt_seq(
        as.POSIXct("2001-12-31", tz = "UTC"),
        as.POSIXct("2002-12-31", tz = "UTC"),
        units = "days"
      )
    ),
    366L
  )
})

test_that("seq.hms", {
  expect_error(dtt_seq(NA_hms_[-1], NA_hms_[-1]),
    class = "chk_error"
  )
  expect_error(dtt_seq(NA_hms_, NA_hms_[-1]), class = "chk_error")
  expect_error(
    dtt_seq(hms::as_hms("00:00:00"), NA_hms_[-1]),
    class = "chk_error"
  )
  expect_error(
    dtt_seq(hms::as_hms("00:00:00"), NA_hms_),
    class = "chk_error"
  )
  expect_error(
    dtt_seq(hms::as_hms("00:00:00"), hms::as_hms("00:00:00"), units = "days"),
    "`units` must match 'hours', 'minutes' or 'seconds'",
    class = "chk_error"
  )

  expect_error(
    dtt_seq(hms::as_hms("00:00:00"), length_out = 86401L),
    "length_out of units must not exceed 24 hours"
  )

  expect_error(
    dtt_seq(hms::as_hms("00:00:00"), length_out = 25L, units = "hours"),
    "length_out of units must not exceed 24 hours"
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), length_out = 0L),
    hms::as_hms("00:00:00")[-1]
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), length_out = 2L),
    hms::as_hms(c("00:00:00", "00:00:01"))
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), length_out = 24L, units = "hours"),
    hms::as_hms(paste0(c(
      "00", "01", "02", "03", "04", "05",
      "06", "07", "08", "09", 10:23
    ), ":00:00"))
  )

  expect_identical(
    dtt_seq(hms::as_hms("01:00:00"), length_out = 24L, units = "hours"),
    hms::as_hms(paste0(c(
      "01", "02", "03", "04", "05",
      "06", "07", "08", "09", 10:23, "00"
    ), ":00:00"))
  )

  expect_identical(
    length(dtt_seq(hms::as_hms("00:00:00"), length_out = -2L)),
    86400L
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), hms::as_hms("00:00:00")),
    hms::as_hms("00:00:00")
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), hms::as_hms("00:00:02")),
    hms::as_hms(c("00:00:00", "00:00:01", "00:00:02"))
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), hms::as_hms("00:00:02"), units = "hours"),
    hms::as_hms("00:00:00")
  )

  expect_identical(
    dtt_seq(
      hms::as_hms("00:00:00"),
      hms::as_hms("00:02:02"),
      units = "minutes"
    ),
    hms::as_hms(c("00:00:00", "00:01:00", "00:02:00"))
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:00:00"), hms::as_hms("01:02:02"), units = "hours"),
    hms::as_hms(c("00:00:00", "01:00:00"))
  )

  expect_identical(
    dtt_seq(hms::as_hms("00:59:59"), hms::as_hms("01:00:00"), units = "hours"),
    hms::as_hms(c("00:00:00", "01:00:00"))
  )

  expect_identical(
    length(dtt_seq(hms::as_hms("00:00:01"), hms::as_hms("23:59:59"))),
    86399L
  )
  expect_identical(
    length(
      dtt_seq(
        hms::as_hms("23:59:59"),
        hms::as_hms("00:00:01"),
        wrap = FALSE
      )
    ),
    86399L
  )
  expect_identical(
    dtt_seq(hms::as_hms("23:59:59"), hms::as_hms("00:00:01")),
    hms::as_hms(c("23:59:59", "00:00:00", "00:00:01"))
  )
})