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test_that("string vectors with only empty strings and nulls don't allocate a data buffer (ARROW-3693)", {
  a <- Array$create("")
  expect_equal(a$length(), 1L)

  buffers <- a$data()$buffers

  # No nulls
  expect_equal(buffers[[1]], NULL)

  # Offsets has 2 elements
  expect_equal(buffers[[2]]$size, 8L)

  # As per ARROW-2744, values buffer should preferably be non-null.
  expect_equal(buffers[[3]]$size, 0L)
  expect_equal(buffers[[3]]$capacity, 0L)
})