@Test
public void testMetrics_sendConfirmation_TwiceUnsuccessful() {

    setNewMetrics();
    boolean isSent = confirmationServiceImpl.sendConfirmation(confirmationInfoMock_notSent);
    assertFalse("send confirmation should be unsuccessful", isSent);
    confirmationServiceImpl.sendConfirmation(confirmationInfoMock_notSent);
    double successRate = getSuccessRate();
    assertEquals(0, successRate, 0);
    assertEquals(2, getAllSent());
    assertEquals(2, getSentFailed());
}