test_that("equivalentMunsellChips works", {
  
  # same "chip page position" different hue page; identify all perceptually equivalent chips
  
  # test 1
  a <- as.list(equivalentMunsellChips("7.5YR", 2, 1)[[1]][, c("hue", "value", "chroma")])
  
  b <- list(
    hue = c("10YR", "5YR", "7.5YR"),
    value = c(2, 2, 2),
    chroma = c(1, 1, 1)
  )
  
  expect_equal(a, b)
  
  
  # test 2
  a <- as.list(equivalentMunsellChips("5YR", 2, 1)[[1]][, c("hue", "value", "chroma")])
  
  b <- list(
    hue = c("10R", "2.5YR", "5YR", "7.5YR"),
    value = c(2, 2, 2, 2),
    chroma = c(1, 1, 1, 1)
  )
  
  expect_equal(a, b)
  
  # test 3
  a <- as.list(equivalentMunsellChips("10YR", 2, 1)[[1]][, c("hue", "value", "chroma")])
  
  b <- list(
    hue = c("10YR", "2.5Y", "7.5YR"),
    value = c(2, 2, 2),
    chroma = c(1, 1, 1)
  )
  
  expect_equal(a, b)
  
})