1 files changed, 8 insertions, 0 deletions

diff --git a/test/src/fns-tests.el b/test/src/fns-tests.el
index e0aed2a71b6..3a43142106b 100644
--- a/test/src/fns-tests.el
+++ b/test/src/fns-tests.el
@@ -1098,3 +1098,11 @@
     (goto-char (point-max))
     (insert "fóo")
     (should (approx-equal (buffer-line-statistics) '(1002 50 49.9)))))
+
+(ert-deftest test-line-number-at-position ()
+  (with-temp-buffer
+    (insert (make-string 10 ?\n))
+    (should (= (line-number-at-position (point)) 11))
+    (should-error (line-number-at-position nil))
+    (should-error (line-number-at-position -1))
+    (should-error (line-number-at-position 100))))