### Question:
RemoteValidatorApiHandler implements ValidatorApiChannel { @Override public void sendAggregateAndProof(final SignedAggregateAndProof aggregateAndProof) { asyncRunner .runAsync( () -> apiClient.sendAggregateAndProof( new tech.pegasys.teku.api.schema.SignedAggregateAndProof(aggregateAndProof))) .finish(error -> LOG.error("Failed to send aggregate and proof", error)); } RemoteValidatorApiHandler(final ServiceConfig config, final AsyncRunner asyncRunner); @VisibleForTesting  RemoteValidatorApiHandler(
      final ValidatorRestApiClient apiClient, final AsyncRunner asyncRunner); @Override SafeFuture<Optional<ForkInfo>> getForkInfo(); @Override SafeFuture<Optional<UInt64>> getGenesisTime(); @Override SafeFuture<Optional<List<ValidatorDuties>>> getDuties(
      final UInt64 epoch, final Collection<BLSPublicKey> publicKeys); @Override SafeFuture<Optional<List<AttesterDuties>>> getAttestationDuties(
      final UInt64 epoch, final Collection<Integer> validatorIndexes); @Override SafeFuture<Optional<List<ProposerDuties>>> getProposerDuties(final UInt64 epoch); @Override SafeFuture<Optional<Attestation>> createUnsignedAttestation(
      final UInt64 slot, final int committeeIndex); @Override void sendSignedAttestation(final Attestation attestation); @Override void sendSignedAttestation(
      final Attestation attestation, final Optional<Integer> validatorIndex); @Override SafeFuture<Optional<BeaconBlock>> createUnsignedBlock(
      final UInt64 slot, final BLSSignature randaoReveal, final Optional<Bytes32> graffiti); @Override void sendSignedBlock(final SignedBeaconBlock block); @Override SafeFuture<Optional<Attestation>> createAggregate(final Bytes32 attestationHashTreeRoot); @Override void sendAggregateAndProof(final SignedAggregateAndProof aggregateAndProof); @Override void subscribeToBeaconCommitteeForAggregation(
      final int committeeIndex, final UInt64 aggregationSlot); @Override void subscribeToPersistentSubnets(final Set<SubnetSubscription> subnetSubscriptions);  }### Answer:
@Test public void sendSAggregateAndProof_InvokeApiWithCorrectRequest() { final AggregateAndProof aggregateAndProof = dataStructureUtil.randomAggregateAndProof(); final BLSSignature signature = dataStructureUtil.randomSignature(); final SignedAggregateAndProof signedAggregateAndProof = new SignedAggregateAndProof(aggregateAndProof, signature); tech.pegasys.teku.api.schema.SignedAggregateAndProof schemaSignedAggAndProof = new tech.pegasys.teku.api.schema.SignedAggregateAndProof(signedAggregateAndProof); ArgumentCaptor<tech.pegasys.teku.api.schema.SignedAggregateAndProof> argumentCaptor = ArgumentCaptor.forClass(tech.pegasys.teku.api.schema.SignedAggregateAndProof.class); apiHandler.sendAggregateAndProof(signedAggregateAndProof); asyncRunner.executeQueuedActions(); verify(apiClient).sendAggregateAndProof(argumentCaptor.capture()); assertThat(argumentCaptor.getValue()) .usingRecursiveComparison() .isEqualTo(schemaSignedAggAndProof); }