diff --git a/tests-integration.sql b/tests-integration.sql
index cc431ee..15f103e 100644
--- a/tests-integration.sql
+++ b/tests-integration.sql
@@ -2,4 +2,4 @@
 
 drop table if exists agg_rivers_wm;
 create table agg_rivers_wm (name text, way geometry);
-insert into agg_rivers_wm (name, way) select name, ST_SimplifyWM_DEBUG(way) from agg_rivers;
+insert into agg_rivers_wm (name, way) select name, ST_SimplifyWM_DEBUG(way) from agg_rivers where name='Nemunas';
diff --git a/tests.sql b/tests.sql
index 4c048b2..33269ee 100644
--- a/tests.sql
+++ b/tests.sql
@@ -26,6 +26,7 @@ insert into figures (name, way) values ('fig6-combi',
   ))
 );
 insert into figures (name, way) values ('inflection-1',ST_GeomFromText('LINESTRING(110 24,114 20,133 20,145 15,145 0,136 5,123 7,114 7,111 2)'));
+insert into figures (name, way) values ('multi',ST_GeomFromText('MULTILINESTRING((-10 -6,-5 -5,0 5,10 6),(-5 -5,-1 -1,0 0,1 -1,5 -5))'));
 
 drop table if exists debug;
 create table debug (i bigint, way geometry);
@@ -54,6 +55,7 @@ insert into demo_selfcrossing3 select name, generate_subscripts(ways, 1), unnest
 -- COMBINED
 drop table if exists demo_wm;
 create table demo_wm (name text, i bigint, way geometry);
+insert into demo_wm (name, way) select name, ST_SimplifyWM_DEBUG(way) from figures where name='multi';
 
 do $$
 declare