@Test
public void lastCalibrationAlert() {

    // :: Setup
    UserNotification.create("test1", "calibration_alert", System.currentTimeMillis());
    UserNotification.create("test2", "calibration_alert", System.currentTimeMillis());

    // :: Act
    UserNotification userNotification = UserNotification.lastCalibrationAlert();

    // :: Verify
    assertThat(userNotification.calibration_alert).isTrue();
    assertThat(userNotification.message).isEqualTo("test2");
}