Handle the exception that will come when codepoints < 'from' < len.

Already done and tested for 'to'.

1 files changed, 1 insertions, 0 deletions

diff --git a/vespajlib/src/test/java/com/yahoo/text/TextTestCase.java b/vespajlib/src/test/java/com/yahoo/text/TextTestCase.java
index 2639882230f..c82eba0246f 100644
--- a/vespajlib/src/test/java/com/yahoo/text/TextTestCase.java
+++ b/vespajlib/src/test/java/com/yahoo/text/TextTestCase.java
@@ -73,6 +73,7 @@ public class TextTestCase {
         String withSurrogates = fromCP("abc", new int[]{0x10F000, 0x10F001, 0x10F002}, "def");
         assertEquals(withSurrogates, Text.substringByCodepoints(withSurrogates, 0, 11));
         assertEquals(withSurrogates, Text.substringByCodepoints(withSurrogates, 0, 20));
+        assertEquals("", Text.substringByCodepoints(withSurrogates, 10, 11));
         assertEquals(fromCP("bc", new int[]{0x10F000, 0x10F001}, ""),
                      Text.substringByCodepoints(withSurrogates, 1, 5));
         assertEquals(fromCP("", new int[]{0x10F001}, ""),