diff --git a/tests/testthat/test-voronoi.R b/tests/testthat/test-voronoi.R
new file mode 100644
index 0000000000..b12e554dc4
--- /dev/null
+++ b/tests/testthat/test-voronoi.R
@@ -0,0 +1,11 @@
+test_that("voronoi works", {
+  res <- voronoi(make_ring(10), c(1, 6))
+  expect_equal(res$membership, c(0, 0, 0, 1, 1, 1, 1, 1, 0, 0))
+  expect_equal(res$distances, c(0, 1, 2, 2, 1, 0, 1, 2, 2, 1))
+})
+
+test_that("voronoi works with weights", {
+  res <- voronoi(make_ring(10), c(1, 6), weights = 1:10)
+  expect_equal(res$membership, c(0, 0, 0, 0, 1, 1, 1, 1, 0, 0))
+  expect_equal(res$distances, c(0, 1, 3, 6, 5, 0, 6, 13, 19, 10))
+})