Asserts job item language codes.
\Drupal\tmgmt\JobItemInterface $job_item: Job item to check.
string $expected_source_lang: Expected source language.
array $actual_lang_codes: Expected existing language codes (translations).
function assertJobItemLangCodes(JobItemInterface $job_item, $expected_source_lang, array $actual_lang_codes) {
$this
->assertEqual($job_item
->getSourceLangCode(), $expected_source_lang);
$existing = $job_item
->getExistingLangCodes();
sort($existing);
sort($actual_lang_codes);
$this
->assertEqual($existing, $actual_lang_codes);
}