+# test failure modes
+testequal 'E: Invalid operation download' apthelper download
+testequal 'E: Must specify at least one pair url/filename' apthelper download-file
+testequal 'E: Must specify at least one pair url/filename' apthelper download-file http://example.org/
+testequal 'E: Need one URL as argument' apthelper auto-detect-proxy