trouble mocking one method

[Sébastien Dionne]

In a junit, I want to mock one method of a instance.  I have a method (  retrieveScannersFromMachineConfig  (); ) that will call a system that is not available and I want to mock the result.  I want the others methods to works normaly.

I try to use spy and mock the method.. but in always go into the real method.. not the mocked one.  I don't know what I did wrong.

The method is this: retrieveScannersFromMachineConfig(NodeDTO node)

I have this

@Inject
ScannerCodec scannerCodec;

@Test
public void testScannersAsync() throws Exception {

...

//ScannerCodec scannerCodecMock = Mockito.mock(ScannerCodec.class, CALLS_REAL_METHODS);
ScannerCodec scannerCodecMock = Mockito.spy(scannerCodec);

Mockito.doReturn(scannerList).when(scannerCodecMock).retrieveScannersFromMachineConfig(any(NodeDTO.class));
//Mockito.when(scannerCodecMock.retrieveScannersFromMachineConfig(machineCodecNodeInTwin)).thenReturn(scannerList);
//Mockito.when(scannerCodecMock.refreshScanners()).thenCallRealMethod();

// will try multiple times to retrieve the scanners
scannerCodecMock.refreshScanners();

I try differents things.. but always return the same results.. except when I use Mock on a class.. I'll obtain NPE for the variable into ScannerCodec (because the are injected)

[Georgios Andrianakis]

Did you try:

Mockito.when(scannerCodecMock.retrieveScannersFromMachineConfig(any(NodeDTO.class)).thenReturn(scannerList);

?

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[Sébastien Dionne]

yes.  same result.  

if I put a breakpoint in the junit test I obtain this

com.comact.iep.codec.service.ScannerCodec@7320bccc 

scannerCodecMock = {ScannerCodec_ClientProxy$MockitoMock$1546714229@15622} "com.comact.iep.codec.service.ScannerCodec@7320bccc"

 mockitoInterceptor = {MockMethodInterceptor@15662} 

  handler = {InvocationNotifierHandler@15666} 

  mockCreationSettings = {CreationSettings@15667} 

   typeToMock = {Class@10846} "class com.comact.iep.codec.service.ScannerCodec_ClientProxy"

   extraInterfaces = {HashSet@15680}  size = 0

   name = null

   spiedInstance = {ScannerCodec_ClientProxy@15617} "com.comact.iep.codec.service.ScannerCodec@7320bccc"

..

we see this : ScannerCodec@7320bccc

but when I'm in the method and I check at the variables, I see this  (The class adress is not the same.)

this = {ScannerCodec@15595} 

 twinRestConnector = {TwinRestConnector_27306872b9b9d6a5cde2e5a56fad18628bb23077_Synthetic_ClientProxy@15597} "RESTEASY004635: Resteasy Client Proxy for : com.comact.iep.connector.TwinRestConnector"

 cmsClientRestConnector = {CmsClientRestConnector_60f95cf0d8aaaa2d85e93c531c682723476b56ec_Synthetic_ClientProxy@15596} "RESTEASY004635: Resteasy Client Proxy for : com.comact.iep.connector.CmsClientRestConnector"

 controller = {ScannerCodecController_ClientProxy@15598} "com.comact.iep.codec.controller.ScannerCodecController@26401eda"

 chartHelper = {ChartHelper_ClientProxy@15599} "com.comact.iep.codec.util.ChartHelper@118cbb26"

 AbstractCodec.twinRestConnector = {TwinRestConnector_27306872b9b9d6a5cde2e5a56fad18628bb23077_Synthetic_ClientProxy@15597} "RESTEASY004635: Resteasy Client Proxy for : com.comact.iep.connector.TwinRestConnector"

 kubernetesApiRestConnector = {KubernetesApiRestConnector_f22da27362baf853b2c5fd216af58a517f31ec01_Synthetic_ClientProxy@15600} "RESTEASY004635: Resteasy Client Proxy for : com.comact.iep.connector.KubernetesApiRestConnector"

 codecValidator = {CodecValidator_ClientProxy@15601} "com.comact.iep.codec.validation.CodecValidator@3299e315"

 mainCodecController = {MainCodecController_Subclass@15602} 

not sure that I missed something so far.  I think the next step is to trace it in Mockito ?

[Sébastien Dionne]

I traced into Mockito.

if I use this

ScannerCodec scannerCodecMock = Mockito.spy(scannerCodec);
Mockito.doReturn(scannerList).when(scannerCodecMock).retrieveScannersFromMachineConfig(any(NodeDTO.class));

// will try multiple times to retrieve the scanners
scannerCodecMock.refreshScanners();

Mockito will check if the method : refreshScanners() is mocked.  if it's not the case.. it will use the real implementation.  But in the real refreshScanners() it will call retrieveScannersFromMachineConfig()..  but mockito is not called.

at least, I know what happen.  Still need to figure out what I should do to mock that usecase