diff --git a/translation_finder/test_api.py b/translation_finder/test_api.py
index c3b020c..9be070d 100644
--- a/translation_finder/test_api.py
+++ b/translation_finder/test_api.py
@@ -173,6 +173,7 @@ class APITest(DiscoveryTestCase):
                     "filemask": "json/gotext-*.json",
                     "template": "json/gotext-en.json",
                 },
+                {'filemask': 'linked/*.po', 'new_base': 'linked/messages.pot', 'file_format': 'po'},
             ],
         )
 
diff --git a/translation_finder/test_discovery.py b/translation_finder/test_discovery.py
index 1a0ca40..14caa4f 100644
--- a/translation_finder/test_discovery.py
+++ b/translation_finder/test_discovery.py
@@ -945,6 +945,9 @@ class JSONDiscoveryTest(DiscoveryTestCase):
                     "file_format": "json-nested",
                     "template": "src/app/[locale]/_translations/en.json",
                 },
+                {'filemask': '*/app/[locale]/_translations/cs.json', 'file_format': 'json-nested'},
+                {'filemask': '*/app/[locale]/_translations/de.json', 'file_format': 'json-nested'},
+                {'filemask': '*/app/[locale]/_translations/en.json', 'file_format': 'json-nested'}
             ],
         )