diff --git a/t/test.t b/t/test.t
index 9c50e52..2820038 100644
--- a/t/test.t
+++ b/t/test.t
@@ -1,6 +1,6 @@
 use strict;
 use warnings;
-use Test::More tests => 68;
+use Test::More tests => 72;
 use Test::Script;
 use Test::TempDir::Tiny;
 use File::Copy;
@@ -196,6 +196,12 @@
 like($zipcontent, qr@GOE/AGA/00000/ud/dependency\.xml@, "conllu2korapxml UDPipe input conversion contains dependency layer with foundry name 'ud'");
 like($zipcontent, qr@rw-rw-rw-.*GOE/AGA/00000/ud/morpho\.xml@, "KorAP-XML zip contents have read and write permissions");
 
+$zipcontent = `$UNZIP -c $zipfile`;
+like($zipcontent, qr/.*<f name="upos">VERB<\/f>.*/, "conllu2korapxml extracts upos tags.");
+like($zipcontent, qr/.*<f name="pos">VVFIN<\/f>.*/, "conllu2korapxml extracts (x)pos tags.");
+unlike($zipcontent, qr/.*<f name="pos">_<\/f>.*/, "conllu2korapxml ignores _ pos tags.");
+unlike($zipcontent, qr/.*<f name="upos">_<\/f>.*/, "conllu2korapxml ignores _ upos tags.");
+
 script_runs([ 'script/conllu2korapxml', 't/data/deu-deps.conllu' ], "Runs conllu2korap with UDPipe input");
 script_stderr_unlike "fileparse(): need a valid pathname", "Ignore sent_id and newdoc id";
 script_stderr_like "WARNING: No valid input document.*token offsets missing", "Warn on missing token offsets";