public CompletableFuture<Void> storeEcSignedPreKeys(final UUID identifier, final byte deviceId, final ECSignedPreKey ecSignedPreKey) {
    return ecSignedPreKeys.store(identifier, deviceId, ecSignedPreKey);
  }
@Test
  void storeEcSignedPreKeys() {
    assertTrue(keysManager.getEcSignedPreKey(ACCOUNT_UUID, DEVICE_ID).join().isEmpty());

    final ECSignedPreKey signedPreKey = generateTestECSignedPreKey(1);

    keysManager.storeEcSignedPreKeys(ACCOUNT_UUID, DEVICE_ID, signedPreKey).join();

    assertEquals(Optional.of(signedPreKey), keysManager.getEcSignedPreKey(ACCOUNT_UUID, DEVICE_ID).join());
  }