skip_if_not_installed("AER")
data(CigarettesSW, package = "AER")
CigarettesSW$rprice <- with(CigarettesSW, price / cpi)
CigarettesSW$rincome <- with(CigarettesSW, income / population / cpi)
CigarettesSW$tdiff <- with(CigarettesSW, (taxs - tax) / cpi)

m1 <- AER::ivreg(
  log(packs) ~ log(rprice) + log(rincome) | log(rincome) + tdiff + I(tax / cpi),
  data = CigarettesSW,
  subset = year == "1995"
)

test_that("ci", {
  expect_equal(
    ci(m1, method = "normal")$CI_low,
    c(7.82022, -1.79328, -0.18717),
    tolerance = 1e-4
  )
})

test_that("se", {
  expect_equal(
    standard_error(m1)$SE,
    c(1.05856, 0.2632, 0.23857),
    tolerance = 1e-4
  )
})

test_that("p_value", {
  expect_equal(
    p_value(m1)$p,
    c(0, 1e-05, 0.24602),
    tolerance = 1e-4
  )
})

test_that("model_parameters", {
  expect_equal(
    model_parameters(m1)$Coefficient,
    c(9.89496, -1.27742, 0.2804),
    tolerance = 1e-4
  )
})

test_that("print-model_parameters", {
  skip_if_not_installed("withr")
  withr::local_options(
    list(
      parameters_exponentiate = TRUE,
      parameters_warning_exponentiate = TRUE
    )
  )
  tmp <- model_parameters(m1)
  expect_snapshot(tmp)
})