context("soil texture summary via marginal percentiles")

# sample data
data('sp4')

ssc <- sp4[grep('^Bt', sp4$name), c('sand', 'silt', 'clay')]
names(ssc) <- toupper(names(ssc))

test_that("textureTriangleSummary() works as expected", {

  skip_if_not_installed(pkg = "Hmisc")

  # requires Tcl/tk, at least on linux
  # throws warning on GH actions / linux: "no DISPLAY variable so Tk is not available"
  skip_if_not_installed(pkg = "soiltexture")

  # does it work?
  s <- textureTriangleSummary(ssc)

  # result is a matrix
  expect_true(inherits(s, 'matrix'))

  # column order preserved
  expect_true(
    all(dimnames(s)[[2]] == c('SAND', 'SILT', 'CLAY'))
  )

})