diff --git a/tests/unit/data/sphinx/sphinx.conf b/tests/unit/data/sphinx/sphinx.conf
index 6be9606..30cf083 100644
--- a/tests/unit/data/sphinx/sphinx.conf
+++ b/tests/unit/data/sphinx/sphinx.conf
@@ -44,7 +44,8 @@ source yii2_test_item_src
 
 	sql_query		= \
 		SELECT *, CURRENT_TIMESTAMP() AS add_date \
-		FROM yii2_test_item
+		FROM yii2_test_item \
+		WHERE id <= 100
 
 	sql_attr_uint		= id
 	sql_attr_uint		= category_id
@@ -55,6 +56,15 @@ source yii2_test_item_src
 }
 
 
+source yii2_test_item_delta_src : yii2_test_item_src
+{
+	sql_query		= \
+		SELECT *, CURRENT_TIMESTAMP() AS add_date \
+		FROM yii2_test_item \
+		WHERE id > 100
+}
+
+
 index yii2_test_article_index
 {
 	source			= yii2_test_article_src
@@ -73,6 +83,13 @@ index yii2_test_item_index
 }
 
 
+index yii2_test_item_delta_index : yii2_test_item_index
+{
+	source			= yii2_test_item_delta_src
+	path			= /var/lib/sphinx/yii2_test_item_delta
+}
+
+
 index yii2_test_rt_index
 {
 	type			= rt