test_that("Test NA values", {
  options(stringsAsFactors=FALSE)
  x <- list(foo=c(TRUE, NA, FALSE, TRUE), bar=c(3.14,NA, 42, NA), zoo=c(NA, "bla", "boe", NA))
  x$mydf <- data.frame(col1=c(FALSE, NA, NA, TRUE), col2=c(1.23, NA, 23, NA))
  x$mydf$mylist <- list(c(TRUE, NA, FALSE, NA), NA, c("blabla", NA), c(NA,12,13,NA,NA,NA,1001))

  expect_true(validate(toJSON(x)))
  expect_equal(fromJSON(toJSON(x)), x);
  expect_equal(fromJSON(toJSON(x, na="null")), x);

});