test_that("interpolating calibration curve works, c14 ages", {
  # Choose ages not in calibration curve
  new_calendar_ages <- c(54770, 54290)

  new_curve <- InterpolateCalibrationCurve(new_calendar_ages, intcal20, F14C_outputs = FALSE)

  # Manually checked these results
  expected_c14_ages <- c(49905, 49660.5)
  expected_c14_sigs <- c(963, 823.5)

  expect_equal(new_curve, data.frame(
    calendar_age_BP=new_calendar_ages,
    c14_age=expected_c14_ages,
    c14_sig=expected_c14_sigs))
})

test_that("interpolating calibration curve works, f14c ages", {
  # Choose ages not in calibration curve
  new_calendar_ages <- c(54770, 54290)

  new_curve <- InterpolateCalibrationCurve(new_calendar_ages, intcal20, F14C_outputs = TRUE)

  # Manually checked these results
  expected_f14c_ages <- c(
    (intcal20$f14c[12] + intcal20$f14c[13])/2,
    (intcal20$f14c[36] + intcal20$f14c[37])/2)
  expected_f14c_sigs <- c(
    (intcal20$f14c_sig[12] + intcal20$f14c_sig[13])/2,
    (intcal20$f14c_sig[36] + intcal20$f14c_sig[37])/2)

  expect_equal(new_curve, data.frame(
    calendar_age_BP=new_calendar_ages,
    f14c=expected_f14c_ages,
    f14c_sig=expected_f14c_sigs))
})

test_that("interpolating calibration curve works, c14 ages, column initially not there", {
  # Choose ages not in calibration curve
  new_calendar_ages <- c(54770, 54290)

  # create a calibration curve that does not have c14 ages
  calcurve <- data.frame(
    calendar_age_BP=intcal20$calendar_age_BP, f14c=intcal20$f14c, f14c_sig=intcal20$f14c_sig)

  new_curve <- InterpolateCalibrationCurve(new_calendar_ages, intcal20, F14C_outputs = FALSE)

  # Manually checked these results
  expected_c14_ages <- c(49905, 49660.5)
  expected_c14_sigs <- c(963, 823.5)

  expect_equal(new_curve, data.frame(
    calendar_age_BP=new_calendar_ages,
    c14_age=expected_c14_ages,
    c14_sig=expected_c14_sigs))
})

test_that("interpolating calibration curve works, f14c ages, column initially not there", {
  # Choose ages not in calibration curve
  new_calendar_ages <- c(54770, 54290)

  # create a calibration curve that does not have f14c ages
  calcurve <- data.frame(
    calendar_age_BP=intcal20$calendar_age_BP, c14_age=intcal20$c14_age, c14_sig=intcal20$c14_sig)

  new_curve <- InterpolateCalibrationCurve(new_calendar_ages, calcurve, F14C_outputs = TRUE)

  # Manually checked these results
  expected_f14c_ages <- c(
    (intcal20$f14c[12] + intcal20$f14c[13])/2,
    (intcal20$f14c[36] + intcal20$f14c[37])/2)
  expected_f14c_sigs <- c(
    (intcal20$f14c_sig[12] + intcal20$f14c_sig[13])/2,
    (intcal20$f14c_sig[36] + intcal20$f14c_sig[37])/2)

  expect_equal(new_curve, data.frame(
    calendar_age_BP=new_calendar_ages,
    f14c=expected_f14c_ages,
    f14c_sig=expected_f14c_sigs))
})

test_that("interpolating calibration curve works, both age scales", {
  # Choose ages not in calibration curve
  new_calendar_ages <- c(54770, 54290)

  new_curve <- InterpolateCalibrationCurve(new_calendar_ages, intcal20, F14C_outputs = NA)

  # Manually checked these results
  expected_c14_ages <- c(49905, 49660.5)
  expected_c14_sigs <- c(963, 823.5)
  expected_f14c_ages <- c(
    (intcal20$f14c[12] + intcal20$f14c[13])/2,
    (intcal20$f14c[36] + intcal20$f14c[37])/2)
  expected_f14c_sigs <- c(
    (intcal20$f14c_sig[12] + intcal20$f14c_sig[13])/2,
    (intcal20$f14c_sig[36] + intcal20$f14c_sig[37])/2)

  expect_equal(new_curve, data.frame(
    calendar_age_BP=new_calendar_ages,
    c14_age=expected_c14_ages,
    c14_sig=expected_c14_sigs,
    f14c=expected_f14c_ages,
    f14c_sig=expected_f14c_sigs))
})