How to Mock ObjectMapper readValue method?

Question

I am trying to mock MAPPER.readValue() but cant get the expected output.

private static final ObjectMapper MAPPER = new ObjectMapper();

String res = EntityUtils.toString(response.getEntity());
PartyDetailInfo partyInfo = MAPPER.readValue(res, PartyDetailInfo.class);

        if (partyInfo.getXpartyInfo() == null || partyInfo.getXpartyInfo().getXpartyInfoItem() == null
                || partyInfo.getXpartyInfo().getXpartyInfoItem().get(0).getOrigSystemRefs() == null
                || partyInfo.getXpartyInfo().getXpartyInfoItem().get(0).getOrigSystemRefs().getOrigSystemRefsItems()
                        .isEmpty()) {
            BusinessException exception = new BusinessException(Constants.ERROR_PARTY_ID_NOT_EXIST
                    .replace(Constants.TEMP_ZERO_REPLACE_STRING, partyDetailRequest.getPartyId()));
            exception.setErrorCode(Integer.toString(HttpStatus.SC_NOT_FOUND));
            throw exception;
        }

I tried mocking it but i ge partyInfo = null;

Mockito.when(Mapper.readValue(Mockito.anyString(),Mockito.eq(PartyDetailInfo.class))).thenReturn(getPartyInfoDummy());

Here's the getPartyInfoDummy():

private PartyDetailInfo getPartyInfoDummy(){
    List<XpartyInfoItem> xpartyInfoItems = new ArrayList<XpartyInfoItem>();

    XpartyInfoItem infoItem = new XpartyInfoItem();
    OrigSystemRefs origSystemRefs = new OrigSystemRefs();
    OrigSystemRefsItem origSystemRefsItem = new OrigSystemRefsItem();
    List<OrigSystemRefsItem> origSystemRefsItems = new ArrayList<OrigSystemRefsItem>();
    origSystemRefsItem.setOrigSystem("PSFT");
    origSystemRefsItem.setOrigSystemReference("PS-47439934");
    PrimaryMlsSet primaryMlsSet = new PrimaryMlsSet();
    primaryMlsSet.setNil("true");
    origSystemRefsItem.setPrimaryMlsSet(primaryMlsSet );
    origSystemRefsItems.add(origSystemRefsItem);
    origSystemRefs.setOrigSystemRefsItems(origSystemRefsItems );
    infoItem.setOrigSystemRefs(origSystemRefs);

    xpartyInfoItems.add(infoItem);
    PartyDetailInfo partyInfo = new PartyDetailInfo();
    XpartyInfo xpartyInfo = new XpartyInfo();

    xpartyInfo.setxReturnStatus(null);
    xpartyInfo.setxErrMsgs(null);
    xpartyInfo.setXpartyInfoItem(xpartyInfoItems);

    partyInfo.setXpartyInfo(xpartyInfo);

    return partyInfo;
}

I dont understand whats going wrong here? Need help.

Answer 1

当您说Mockito.when(Mapper.readValue请确保映射器是一个Mockito.when(Mapper.readValue对象，并且Mockito.when(Mapper.readValue映射器设置为您尝试测试的实例。

Answer 2

Firstly, your Mapper is a locally created object and secondly it is static and final. You cannot mock such objects using mockito. Use Powermock.

Answer 3

在这种问题中，您也可以尝试使用Mockito.doReturn(...).when(...) ，当我遇到类似的问题时，它会有所帮助。

Answer 4

This worked for me on a similar case:

        doThrow(IOException.class).when(objectMapper).readValue(any(A_Random_Class.class), any(Class.class));

This is the method I tried to mock:

public <T> T readValue(File src, JavaType valueType) throws IOException, JsonParseException, JsonMappingException {