shadows/framework/src/main/java/org/robolectric/shadows/ShadowTelephonyManager.java
@Implementation(minSdk = N)
  protected Uri getVoicemailRingtoneUri(PhoneAccountHandle handle) {
    return voicemailRingtoneUriMap.get(handle);
  }
@Implementation(minSdk = N)
  protected Uri getVoicemailRingtoneUri(PhoneAccountHandle handle) {
    return voicemailRingtoneUriMap.get(handle);
  }
Returns {@code null} by default or the value specified via {@link
#setVoicemailRingtoneUri(PhoneAccountHandle, Uri)}.