diff --git a/tests/testthat/_snaps/get_map_data.md b/tests/testthat/_snaps/get_map_data.md
new file mode 100644
index 0000000..6237506
--- /dev/null
+++ b/tests/testthat/_snaps/get_map_data.md
@@ -0,0 +1,4 @@
+# Get map data errs correctly
+
+    You have provided type `fisk` which is not compatible with this function.
+
diff --git a/tests/testthat/test-get_map_data.R b/tests/testthat/test-get_map_data.R
new file mode 100644
index 0000000..b73bb24
--- /dev/null
+++ b/tests/testthat/test-get_map_data.R
@@ -0,0 +1,4 @@
+test_that("Get map data errs correctly", {
+  expect_snapshot_error(get_map_data("fisk"))
+  expect_error(get_map_data("fisk"))
+})