diff -u b/term_merge.test b/term_merge.test
--- b/term_merge.test
+++ b/term_merge.test
@@ -646,7 +646,7 @@
             $this->drupalPost(NULL, array(
               'term_branch[]' => array($terms['parent']->tid),
               'term_trunk[widget]' => $term_trunk_widget,
-              'term_trunk[tid]' => $term->name,
+              'term_trunk[tid]' => $term->name . ' (' . $term->tid . ')',
             ), 'Submit');
             $this->assertText('Trunk term cannot be one of the selected branch terms or their children', $assert_message);
           }