context("interpolate_dut1 tests")

test_that("interpolate_dut1 works", {
  expect_equal(
    interpolate_dut1(as.POSIXct("1994-06-01", tz = "UTC"), "ddt", dut1),
    60.3530,
    tolerance = 0.001
  )
  expect_equal(
    interpolate_dut1(as.POSIXct("1994-07-01", tz = "UTC"), "ddt", dut1),
    60.4012,
    tolerance = 0.001
  )

  expect_equal(
    interpolate_dut1(as.POSIXct("2018-12-02", tz = "UTC"), "ut1_utc", dut1),
    -0.0137963,
    tolerance = 1e-3
  )
  expect_equal(
    interpolate_dut1(as.POSIXct("2019-01-01", tz = "UTC"), "ut1_utc", dut1),
    -0.0361691,
    tolerance = 1e-3
  )
})