test_that("Case when arg input is NULL", {
  # Check when arg input is NULL
  expect_identical(check_args(NULL), NULL)
})

test_that("Case when type input is not NULL", {
  # Check when arg is character vector
  expect_identical(check_args(c("a", "b", "c"), type = c("character")), NULL)

  # Check when arg is numeric vector
  expect_identical(check_args(c(1, 2, 3), type = c("numeric")), NULL)

  # Check when arg is integer vector
  expect_identical(check_args(c(1L, 2L, 3L), type = c("integer")), NULL)

  # Check when arg is character matrix
  expect_identical(
    check_args(matrix(c("a", "b", "c", "d"), nrow = 2, ncol = 2),
      type = c("character")
    ),
    NULL
  )

  # Check when arg is integer matrix
  expect_identical(
    check_args(matrix(1:9, nrow = 3, ncol = 3),
      type = c("integer")
    ),
    NULL
  )

  # Check when arg is data frame
  expect_identical(
    check_args(iris[1:10, ],
      type = c("data.frame")
    ),
    NULL
  )
})

test_that("Case when length input is not NULL", {
  # Check when arg is character vector
  expect_identical(
    check_args(c("a", "b", "c"),
      type = c("character"),
      length = 3
    ),
    NULL
  )

  # Check when arg is numeric vector
  expect_identical(
    check_args(c(1, 2, 3, 4, 5),
      type = c("numeric"),
      length = 5
    ),
    NULL
  )

  # Check when arg is integer vector
  expect_identical(
    check_args(c(1L, 2L),
      type = c("integer"),
      length = 2
    ),
    NULL
  )

  # Check when arg is character matrix
  expect_identical(
    check_args(matrix(c("a", "b", "c", "d"), nrow = 2, ncol = 2),
      type = c("character"),
      length = 4
    ),
    NULL
  )

  # Check when arg is integer matrix
  expect_identical(
    check_args(matrix(1:9, nrow = 3, ncol = 3),
      type = c("integer"),
      length = 9
    ),
    NULL
  )

  # Check when arg is data frame
  expect_identical(
    check_args(iris[1:10, 1:2],
      type = c("data.frame"),
      length = 2
    ),
    NULL
  )
})

test_that("Case when dim input is not NULL", {
  # Check when arg is data frame
  expect_identical(
    check_args(iris[1:10, 1:2],
      type = c("data.frame"),
      dim = c(10, 2)
    ),
    NULL
  )
})

test_that("Test if correct message note is provided for differenct cases", {
  # Check when no input is given
  expect_error(
    check_args(),
    'argument "arg" is missing, with no default'
  )

  # Check when arg and type do not match
  expect_error(
    check_args(c(1, 2, 3), type = c("character")),
    "The argument type did not match: character"
  )

  # Check when arg length and length input do not match
  expect_error(
    check_args(c(1, 2, 3),
      type = c("numeric"),
      length = 2
    ),
    "The argument length is not 2"
  )

  # Check when arg dimensions and dim input do not match
  expect_error(
    check_args(iris[1:10, 1:2],
      type = c("data.frame"),
      dim = c(1, 2)
    ),
    "The argument dimension is not 1,2"
  )
})