@Test
public void testForRecipientAddressErrorIfNoRecipientsProvidedForSendAsSeparateMails() {

    // setup
    // exercise
    MailerResult result = mailerWithTemplate.sendMailAsSeparateMails(null, null, null, template, ruedi);
    // verify
    assertEquals(MailerResult.RECIPIENT_ADDRESS_ERROR, result.getReturnCode());
    verifyTimesCallingCreateAndSendMessageInvocationsFor(0, null, null, null);
}