diff --git a/t/tokenization.t b/t/tokenization.t
index 4c4ddaa..4e883d1 100644
--- a/t/tokenization.t
+++ b/t/tokenization.t
@@ -60,6 +60,16 @@
 like($tokens->stream->pos(14)->to_string, qr/s:Der/);
 
 
+my $json = decode_json $tokens->to_json;
+is($json->{docSigle}, 'WPD/AAA', 'DocSigle old');
+is($json->{author}, 'Ruru; Jens.Ol; Aglarech; u.a.', 'author old');
+
+$json = decode_json $tokens->to_json(0.4);
+is($json->{fields}->[0]->{key}, 'corpusSigle');
+is($json->{fields}->[0]->{value}, 'WPD');
+is($json->{fields}->[6]->{key}, 'creationDate');
+is($json->{fields}->[6]->{value}, '2005');
+
 done_testing;
 
 __END__