Call external stub from grpc test class - spring-boot

Question

I am trying to call the grpc service using stub (proto are present in the different jar file). But when I am trying to call that service I am getting caused by io.grpc.statusruntimeexception unimplemented method not found. The same is working fine in main class but not in test case.
DeviceGroupServiceImplBase deviceService = Mockito.mock(DeviceGroupServiceImplBase.class,
AdditionalAnswers.delegatesTo(new DeviceGroupServiceImplBase() {
}));
public void createInProcessServerAndChannel() throws IOException {
// Generate a unique in-process server name.
String serverName = InProcessServerBuilder.generateName();
// Create a server, add service, start, and register for automatic graceful
// shutdown.
grpcCleanup.register(
InProcessServerBuilder.forName(serverName).directExecutor().addService(deviceService).build().start());
// Create a client channel and register for automatic graceful shutdown.
ManagedChannel channel = grpcCleanup
.register(InProcessChannelBuilder.forName(serverName).directExecutor().build());
// Create a DeviceGroupServiceClient using the in-process channel;
groupStub = DeviceGroupServiceGrpc.newBlockingStub(channel);
}
// Test case code
When("user calls getDevice with valid deviceUUID {string}", (String deviceUUID) -> {
DeviceUuid request = DeviceUuid.newBuilder().setDeviceUuid(deviceUUID).build();
DeviceGroup groupData = groupStub.getDeviceGroupByDeviceUuid(request);
});

Answer 1

you need to implement getDeviceGroupByDeviceUuid, by default it returns unimplemented status. you can verify if it is calling ServerCall#asyncUnimplementedUnaryCall.
DeviceGroupServiceImplBase deviceService =
Mockito.mock(
DeviceGroupServiceImplBase.class,
AdditionalAnswers.delegatesTo(
new DeviceGroupServiceImplBase() {
#Override
public void getDeviceGroupByDeviceUuid(
DeviceUuid request, StreamObserver<DeviceGroup> responseObserver) {
// TODO: implement
}
}));