1 files changed, 6 insertions, 0 deletions
diff --git a/source/blender/blenlib/tests/BLI_index_range_test.cc b/source/blender/blenlib/tests/BLI_index_range_test.cc
index 10f6784cd44..f5b994d409a 100644
--- a/source/blender/blenlib/tests/BLI_index_range_test.cc
+++ b/source/blender/blenlib/tests/BLI_index_range_test.cc
@@ -105,6 +105,12 @@ TEST(index_range, OneAfterEnd)
   EXPECT_EQ(range.one_after_last(), 8);
 }
 
+TEST(index_range, OneBeforeStart)
+{
+  IndexRange range = IndexRange(5, 3);
+  EXPECT_EQ(range.one_before_start(), 4);
+}
+
 TEST(index_range, Start)
 {
   IndexRange range = IndexRange(6, 2);