Nothing

```
testthat::context("Test coordinates can be extracted from WKT polygons")
testthat::test_that("Coordinates can be extracted from valid polygons", {
result <- wkt_coords("POLYGON ((30 10, 40 40, 20 40, 10 20, 30 10))")
expect_true(is.data.frame(result))
testthat::expect_length(result, 4)
testthat::expect_equal(nrow(result), 5)
testthat::expect_equal(result[1,1], 1)
testthat::expect_equal(result[1,2], "outer")
testthat::expect_equal(result[1,3], 30)
testthat::expect_equal(result[1,4], 10)
})
testthat::test_that("Invalid polygons are handled correctly", {
result <- wkt_coords("POLYGGKFDMGLFKGMON ((30 10, 40 40, 20 40, 10 20, 30 10))")
expect_true(is.data.frame(result))
testthat::expect_length(result, 4)
testthat::expect_equal(nrow(result), 1)
testthat::expect_equal(result[1,1], 1)
testthat::expect_equal(sum(is.na(result)), 3)
})
testthat::test_that("non-objects are handled correctly", {
result <- wkt_coords(NA_character_)
expect_true(is.data.frame(result))
testthat::expect_length(result, 4)
testthat::expect_equal(nrow(result), 1)
testthat::expect_equal(result[1,1], 1)
testthat::expect_equal(sum(is.na(result)), 3)
})
testthat::test_that("multi-layer polygons are handled correctly", {
p <- "POLYGON((-125 40.9, -125 38.4), (-115 22.4, -111.8 22.4))"
result <- wkt_coords(p)
expect_true(is.data.frame(result))
testthat::expect_length(result, 4)
testthat::expect_equal(nrow(result), 4)
testthat::expect_equal(result[1,1], 1)
testthat::expect_equal(result[3,2], "inner 1")
testthat::expect_equal(result[3,4], 22.4)
})
```

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