diff --git a/tests/StringCalcTest.php b/tests/StringCalcTest.php
index 57362e5..25d8bc9 100644
--- a/tests/StringCalcTest.php
+++ b/tests/StringCalcTest.php
@@ -236,6 +236,8 @@ public function testCalculations()
             ['min(2)', 2],
             ['min(2,1.1)', 1.1],
             ['min(1,2,3)', 1],
+            ['min(-5, -10)', -10],
+            ['min(-10, -5)', -10],
             ['pow(2,3)', 8],
             ['radToDeg(2)', 114.59155902616],
             ['round(1.8)', 2],