Fix a problem causing an assert() to fail if a snippet containing 0 tokens was requested from fts3.

FossilOrigin-Name: eafd0a1e3f25f38d551603f177ff4634cf79de77

1 files changed, 19 insertions, 0 deletions

diff --git a/test/fts3snippet.test b/test/fts3snippet.test
index e97db586e..4e1d123b2 100644
--- a/test/fts3snippet.test
+++ b/test/fts3snippet.test
@@ -538,6 +538,25 @@ do_execsql_test 3.4 {
   SELECT snippet(t3) FROM t3 WHERE t3 MATCH 'one OR two OR three';
 } {{[<b>one</b> <b>two</b> <b>three</b>]}}
 
+#-------------------------------------------------------------------------
+# Request a snippet 0 tokens in size. This is always an empty string.
+do_execsql_test 4.1 {
+  CREATE VIRTUAL TABLE t4 USING fts4;
+  INSERT INTO t4 VALUES('a b c d');
+  SELECT snippet(t4, '[', ']', '...', 0, 0) FROM t4 WHERE t4 MATCH 'b';
+} {{}}
+
+do_test 4.2 {
+  set x35 [string trim [string repeat "x " 35]]
+  execsql "INSERT INTO t4 VALUES('$x35 E $x35 F $x35 G $x35');"
+  llength [db one {
+    SELECT snippet(t4, '', '', '', 0, 64) FROM t4 WHERE t4 MATCH 'E'
+  }]
+} {64}
+
+
+
+
 set sqlite_fts3_enable_parentheses 0
 finish_test