How to enter and test catch clause. Spring-boot, Junit, Mockito - spring

Question

I'm trying to test the following code part. Especially the catch:
try {
preAuthCompleteResponse = preAuthCompleteClient
.getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel)));
} catch (IOException | MarshalSendAndReceiveException e) {
logger.error(e.getMessage(), e);
return new ResponseEntity<>(
new SvsTransactionResponseModel(HttpStatus.BAD_REQUEST, e.getMessage()),
HttpStatus.BAD_REQUEST);
}
In one test I want expect that a IOException is catched and in the other test I want expect that a MarshalSendAndReceiveException is catched. Both return then the SvsTransactionResponseModel with status HttpStatus.BAD_REQUEST.
The preAuthCompleteClient.getPreAuthCompleteResponse method throws a MarshalSendAndReceiveException and preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest throws an IOException.
My test looks like that:
#RunWith(MockitoJUnitRunner.class)
public class PreAuthCompleteControllerTest {
#Mock
private PreAuthCompleteService preAuthCompleteServiceImpl;
#Mock
private PreAuthCompleteRequestService preAuthCompleteRequestServiceImpl;
#Mock
private PreAuthCompleteClient preAuthCompleteClient;
#Mock
private Errors errors;
private PreAuthCompleteController preAuthCompleteController;
#Before
public void setUp() {
preAuthCompleteController = new PreAuthCompleteController(preAuthCompleteServiceImpl,
preAuthCompleteRequestServiceImpl, preAuthCompleteClient);
}
#Test
public void testGetPreAuthCompleteExpectIOException() throws MarshalSendAndReceiveException, IOException {
when(preAuthCompleteClient.getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(new PreAuthCompleteModel()))))
.thenReturn(new PreAuthCompleteResponse());
ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
.getPreAuthComplete(null, errors);
assertTrue(responseEntity.getBody() != null);
assertTrue(responseEntity.getStatusCodeValue() == 400);
}
}
I tried different solution using Mockito.when, Mockito.thenThrow or doThrow and so on. But got different exceptions or unsuccesful tests. I am out of ideas.
How can I test that the exceptions are catched and the ResponseEntity return correctly.
P.S. All the mock config work.

Answer 1

To help make sense of things I have broken this call ...
preAuthCompleteResponse = preAuthCompleteClient
.getPreAuthCompleteResponse(preAuthCompleteServiceImpl.getPreAuthComplete(
preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel)));
... down into its constituent parts:
PreAuthCompleteRequest preAuthCompleteRequest = preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(preAuthCompleteModel);
PreAuthComplete preAuthComplete = preAuthCompleteServiceImpl.getPreAuthComplete(preAuthCompleteRequest);
PreAuthCompleteResponse preAuthCompleteResponse = preAuthCompleteClient.getPreAuthCompleteResponse(preAuthComplete);
I'm guessing about the return types (PreAuthCompleteRequest, PreAuthComplete etc) but you get the idea (I think :). Given the above call sequence, the following tests should pass:
#Test
public void badRequestWhenPreAuthCompleteResponseFails() {
// preAuthCompleteController.getPreAuthComplete() invokes
// preAuthCompleteClient.getPreAuthCompleteResponse()
// and any MarshalSendAndReceiveException throw by that client should result in a BAD_REQUEST
MarshalSendAndReceiveException expectedException = new MarshalSendAndReceiveException("boom!");
when(preAuthCompleteClient.getPreAuthCompleteResponse(Mockito.any(PreAuthComplete.class))).thenThrow(expectedException);
ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
.getPreAuthComplete(null, errors);
assertTrue(responseEntity.getBody() != null);
assertTrue(responseEntity.getStatusCodeValue() == 400);
}
#Test
public void badRequestWhenPreAuthCompleteRequestFails() {
// preAuthCompleteController.getPreAuthComplete() invokes
// preAuthCompleteClient.getPreAuthCompleteResponse() which then invokes
// preAuthCompleteServiceImpl.getPreAuthComplete() which then invokes
// preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest
// and any IOException throw by that call should result in a BAD_REQUEST
IOException expectedException = new IOException("boom!");
when(preAuthCompleteRequestServiceImpl.getPreAuthCompleteRequest(Mockito.any(PreAuthCompleteModel.class))).thenThrow(expectedException);
ResponseEntity<SvsTransactionResponseModel> responseEntity = (ResponseEntity<SvsTransactionResponseModel>) preAuthCompleteController
.getPreAuthComplete(null, errors);
assertTrue(responseEntity.getBody() != null);
assertTrue(responseEntity.getStatusCodeValue() == 400);
}