jackson object 映射器中的模拟异常流

Question

这是方法

public String getProductCategoryJSON(NestedProductCategoryMap nestedProductCategoryMap) {
try {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
    return objectMapper.writeValueAsString(nestedProductCategoryMap.getRoot());
} catch (Exception e) {
    LOGGER.error("error-code:{} error: JSON conversion failed ", JSON_CONVERSION.getErrorCode(), e);
    throw new ValidationException(ExceptionEnum.JSON_CONVERSION,e);
}

}

这是我尝试过但似乎不起作用的测试

    @Test(expected = Exception.class)
public void test_getProductCategoryJSON_Should_ReturnException() throws Exception {

    NestedProductCategoryMap nestedProductCategoryMap = new NestedProductCategoryMap();
    nestedProductCategoryMap.makeCat(1,"(");
    nestedProductCategoryMap.makeCat(2,"s2");
    String json="{";

    ObjectMapper objectMapperMock = Mockito.mock(ObjectMapper.class);
    Mockito.when(objectMapperMock.writeValueAsString(any(NestedProductCategoryMap.class))).thenThrow(new JsonProcessingException("test"){});



    Assert.assertNotEquals(json,jsonUtil.getProductCategoryJSON(nestedProductCategoryMap));
}

是否有适当的方法来执行此内部 mocking 的 jackson object 映射器

Answer 1

您可以重写断言异常的块：

重写这个：

ObjectMapper objectMapperMock = Mockito.mock(ObjectMapper.class);
Mockito.when(objectMapperMock.writeValueAsString(any(NestedProductCategoryMap.class))).thenThrow(new JsonProcessingException("test"){});

对此：

Exception exception = assertThrows(Exception.class, () -> {
    ObjectMapper objectMapperMock = Mockito.mock(ObjectMapper.class);
    Mockito.when(objectMapperMock.writeValueAsString(any(NestedProductCategoryMap.class)));
});