Nothing
      context("Crosstable")
test_that("Binary case",{
  
  tar <- rep(0L:1, 5)
  feat <- rep(0L:1, 5)
  fast_crosstable(tar, length(tar), sum(tar),  feat)
  expect_equal(fast_crosstable(tar, length(tar), sum(tar),  feat), 
               c(5L, 0L, 0L, 5L))
})
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