test_that("spread_areas() works", {
## TODO: Where is demo_areas?
## expect_error(spread_areas(demo_areas, -4))
## expect_error(spread_areas(demo_areas, 7))
## expect_equal(nrow(spread_areas(demo_areas)), 32L)
## expect_equal(nrow(spread_areas(demo_areas, min_level = 1, max_level = 3)), 28L)
})
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