test_that("general data conversions", {
  if(!requireNamespace("fastICA", quietly = TRUE))
    skip("FastICA not available")
  irisData <- as(iris[, 1:4], "dimRedData")
  expect_equal(class(irisData)[1], "dimRedData")

  irisRes <- embed(irisData, "FastICA")
  expect_equal(class(irisRes)[1],   "dimRedResult")

  expect_equal(2, getNDim(irisRes))

  expect_equal(irisRes@apply(irisData), irisRes@data)

  expect(
    sqrt(
      mean(
      (irisRes@inverse(irisRes@data)@data - irisData@data) ^ 2
      )
    ) < 0.3,
    "error too large"
  )

  expect_equal(
    scale(iris[1:4], TRUE, FALSE) %*% getRotationMatrix(irisRes),
    unname(as.matrix(getData( getDimRedData(irisRes) )) )
  )
})