tests/testthat/test-bytes.r

In hadley/pryr: Tools for Computing on the Language

context("bytes")

test_that("bytes produces hex representations as expected", {

  expect_identical(
    bytes(1L),
    c("00 00 00 01")
  )

  expect_identical(
    bytes(1),
    "3F F0 00 00 00 00 00 00"
  )

  expect_identical(
    bytes("aa"),
    paste(bytes("a"), bytes("a"))
  )

})

test_that("bytes produces binary representations as expected", {

  expect_identical(
    bits(1L),
    "00000000 00000000 00000000 00000001"
  )

  expect_identical(
    bits(1),
    "00111111 11110000 00000000 00000000 00000000 00000000 00000000 00000000"
  )

})

test_that("encoding doesn't affect what bits / bytes are read", {

  x <- y <- z <- "\u9b3c"
  Encoding(y) <- "bytes"
  Encoding(z) <- "latin1"
  expect_identical( bytes(x), bytes(y) )
  expect_identical( bytes(y), bytes(z) )

  expect_identical( bits(x), bits(y) )
  expect_identical( bits(y), bits(z) )

})


test_that("we read character strings in the right order", {

  test_char_repr <- function(f) {
    f <- match.fun(f)
    repr <- f(c("a", "ab", "abc"))
    first_repr <- unlist(lapply(strsplit(repr, " "), "[[", 1))
    lu <- length(unique(first_repr))
    return(lu)
  }

  expect_equal(test_char_repr(bytes), 1)
  expect_equal(test_char_repr(bits), 1)


})