@Test
    void maxOutboundSize_exact() {
        // set at least one field to ensure the size is non-zero.
        final StreamingOutputCallRequest request =
                StreamingOutputCallRequest.newBuilder()
                                          .addResponseParameters(ResponseParameters.newBuilder().setSize(1))
                                          .build();
        final TestServiceBlockingStub stub =
                Clients.newDerivedClient(
                        blockingStub,
                        GrpcClientOptions.MAX_OUTBOUND_MESSAGE_SIZE_BYTES.newValue(
                                request.getSerializedSize()));
        stub.streamingOutputCall(request).next();
    }
Must be at least {@link #unaryPayloadLength()}, plus some to account for encoding overhead.
grpc/src/test/java/com/linecorp/armeria/client/grpc/GrpcClientTest.java