Helper function that returns a .po file with an empty last item.
function getPoFileWithMsgstr() {
return <<<EOF
msgid ""
msgstr ""
"Project-Id-Version: Drupal 8\\n"
"MIME-Version: 1.0\\n"
"Content-Type: text/plain; charset=UTF-8\\n"
"Content-Transfer-Encoding: 8bit\\n"
"Plural-Forms: nplurals=2; plural=(n > 1);\\n"
msgid "Operations"
msgstr "Műveletek"
msgid "Will not appear in Drupal core, so we can ensure the test passes"
msgstr ""
EOF;
}