test_that("array_extract() works", {
  x <- array(rep(NA, 27), dim = c(3, 3, 3))
  x[1, 2, 3] <- TRUE
  expect_true(array_extract(x, `2` = 2, `3` = 3))
  val <- x
  expect_true(array_extract(val, `2` = 2, `3` = 3))

  x <- array(1:9, dim = c(3, 3))
  dimnames(x) <- list(one = LETTERS[1:3], two = letters[1:3])

  expect_identical(array_extract(x, 1, 2), x[1, 2])
  expect_identical(array_extract(x, "A", "b"), array_extract(x, 1, 2))
  y <- fact(c("A", "b"))
  expect_identical(array_extract(x, y[1], y[2]), array_extract(x, 1, 2))
})

test_that("array_extract() errors", {
  x <- array(1:9, dim = c(3, 3))
  expect_error(array_extract(1), class = "simpleError")
  expect_error(array_extract(x, 2, 3), NA)
  expect_error(array_extract(x, a = 2, b = 3), class = "arrayExtractNamesError")
})