diff --git a/src/org/rascalmpl/library/lang/rascal/tests/library/analysis/statistics/RangeUtils.rsc b/src/org/rascalmpl/library/lang/rascal/tests/library/analysis/statistics/RangeUtils.rsc
index 86472fb35a9..d87ea05c3f9 100644
--- a/src/org/rascalmpl/library/lang/rascal/tests/library/analysis/statistics/RangeUtils.rsc
+++ b/src/org/rascalmpl/library/lang/rascal/tests/library/analysis/statistics/RangeUtils.rsc
@@ -46,4 +46,5 @@ within the range as much as possible.
 list[&T <: num] assureRange(list[&T <: num] nums, &T <: num low, &T <: num high)
 	= [assureRange(n, low, high) | n <- nums];
 
-test bool assureRangeListTest() = assureRange([0..10], 100, 110) == [100..110];
\ No newline at end of file
+test bool assureRangeListTest() = assureRange([0..10], 100, 110) == [100..110];
+test bool assureRangeListTestNeg() = assureRange([0..-10], 100, 110) == [100, *[109,108,107,106,105,104,103,102,101]];
\ No newline at end of file