diff --git a/tests/NodaTimeSplitterTest.php b/tests/NodaTimeSplitterTest.php
index 0d1d0fa..c9aceea 100644
--- a/tests/NodaTimeSplitterTest.php
+++ b/tests/NodaTimeSplitterTest.php
@@ -627,6 +627,7 @@ final class NodaTimeSplitterTest extends TestCase {
 
         foreach ([
             "30.02.2024",
+            "-100-100",
             "31.11.2024",
             "31.4.2024",
             "1.2.2020-2.2.2020",