test_that("validate_data", {
  # Test 1: data must be a data frame
  expect_error(
    validate_data(1, "a", "b"),
    "must be a data frame"
  )
  expect_error(
    validate_data(list(a = 1), "a", "b"),
    "must be a data frame"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 1), "a", "b")
  )

  # Test 2: data must have one or more rows
  expect_error(
    validate_data(data.frame(a = numeric(0), b = character(0)), "a", "b"),
    "must have one or more rows"
  )

  # Test 3: data must have two or more columns
  expect_error(
    validate_data(
      data.frame(a = 1),
      "a",
      "b"
    ),
    "must have two or more columns"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b")
  )

  # Test 4: layout must be length 1 and character
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", layout = 1),
    "must be character"
  )
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", layout = c("a", "b")),
    "must be length 1"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", layout = "::::a")
  )

  # Test 5: layout must begin with at least three or more repetitions of ":"
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", layout = "a"),
    "must begin with at least three or more repetitions of \":\""
  )

  # Test 6: heading_levels must be numeric
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = "a"),
    "must be numeric"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = 1)
  )

  # Test 7: heading_levels must be length 1 or greater
  expect_error(
    validate_data(
      data.frame(a = 1, b = 2),
      "a",
      "b",
      heading_levels = numeric(0)
    ),
    "must be length 1 or greater"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = 1)
  )

  # Test 8: heading_levels must not include NaN
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = NaN),
    "must not include NaN"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = 1)
  )

  # Test 9: heading_levels must not be infinite
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = Inf),
    "must not be infinite"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = 1)
  )

  # Test 10: tabset_vars must be of length 1 or more
  expect_error(
    validate_data(data.frame(a = 1, b = 2), NULL, "b"),
    "must be of length 1 or more"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b")
  )

  # Test 11: tabset_vars must not contain list columns
  expect_error(
    validate_data(tibble::tibble(a = list(1), b = 2), "a", "b"),
    "must have one of the following classes"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b")
  )

  # Test 12: heading_levels and tabset_vars must have the same length
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = c(1, 2)),
    "must be the same"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b", heading_levels = 1)
  )

  # Test 13: output_vars must be of length 1 or more
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", NULL),
    "must be of length 1 or more"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b")
  )

  # Test 14: there must not be variables that are included in
  # both tabset_vars and output_vars
  expect_error(
    validate_data(data.frame(a = 1, b = 2), "a", "a"),
    " must not be variables that are included in both"
  )
  expect_no_error(
    validate_data(data.frame(a = 1, b = 2), "a", "b")
  )
})