```
context('sample')
test_that("random downsampling samples the correct proportion", {
n = 30
ds = 6
rand_indices <- random_sample(n, ds)
down_indices <- downsample_perm(n, ds)
rand_lens <- unlist(lapply(rand_indices, length))
down_lens <- unlist(lapply(down_indices, length))
indices_sorted <- !unlist(lapply(rand_indices, is.unsorted))
expect_that(length(rand_indices) == length(down_indices), is_true())
expect_that(all(rand_lens == down_lens), is_true())
expect_that(all(indices_sorted == TRUE), is_true())
})
```

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