diff --git a/js.t b/js.t
index cc66cd3..739cc8a 100644
--- a/js.t
+++ b/js.t
@@ -232,7 +232,7 @@
 
 EOF
 
-$t->try_run('no njs available')->plan(23);
+$t->try_run('no njs available')->plan(26);
 
 ###############################################################################
 
@@ -244,6 +244,18 @@
 like(http_get('/arg?foO=12345'), qr/arg=12345/, 'r.args');
 like(http_get('/iarg?foo=12345&foo2=bar&nn=22&foo-3=z'), qr/12345barz/,
 	'r.args iteration');
+
+TODO: {
+local $TODO = 'not yet'
+		unless http_get('/njs') =~ /^([.0-9]+)$/m && $1 ge '0.3.0';
+
+like(http_get('/iarg?foo=123&foo2=&foo3&foo4=456'), qr/123undefined456/,
+	'r.args iteration 2');
+like(http_get('/iarg?foo=123&foo2=&foo3'), qr/123/, 'r.args iteration 3');
+like(http_get('/iarg?foo=123&foo2='), qr/123/, 'r.args iteration 4');
+
+}
+
 like(http_get('/status'), qr/204 No Content/, 'r.status');
 
 like(http_post('/body'), qr/REQ-BODY/, 'request body');