$message = $this->prophesize(MigrateMessageInterface::class);
// Match the expected message. Can't use default argument types, because
// we need to convert to string from TranslatableMarkup.
$message = $this->prophesize(MigrateMessageInterface::class);
// Match the expected message. Can't use default argument types, because
// we need to convert to string from TranslatableMarkup.