java - 对 ExceptionHandler 类进行单元测试

Question

我正在尝试为 ExceptionHandler 类编写单元测试，但我不是 100% 确定如何进行。我正在努力弄清楚如何使用错误列表设置 MethodArgumentNotValidException 类？

@ControllerAdvice
public class InputExceptionHandler extends ResponseEntityExceptionHandler {

    private static final String INVALID_CHARACTER_MESSAGE = "Fields contain invalid characters:";

    @Override
    protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
                                                                  HttpHeaders headers,
                                                                  HttpStatus status,
                                                                  WebRequest request) {

        final List<String> errorList = getErrorList(ex);
        final StringBuilder errorMessage = new StringBuilder(popFirstError(errorList));
        if(errorMessage.toString().contains(INVALID_CHARACTER_MESSAGE)) {
            combineDuplicateErrorMessage(errorList, errorMessage);
        }
        return ResponseEntity.status(HttpStatus.UNPROCESSABLE_ENTITY).body(makeBankDetailsValidationModel(errorMessage.toString()));
    }

    private BankDetailsValidationModel makeBankDetailsValidationModel(String validationErrorDescription){
        return new BankDetailsValidationModel(false, false, validationErrorDescription, "");
    }

    private StringBuilder combineDuplicateErrorMessage(List<String> errorList, StringBuilder errorMessage) {
        return errorList.stream()
                .filter(value -> value.contains(INVALID_CHARACTER_MESSAGE))
                .findFirst()
                .map(value -> errorMessage.append(", ").append(value.substring(35)))
                .orElse(null);
    }

    private String popFirstError(List<String> errorMessages) {
        final String message = errorMessages.get(0);
        errorMessages.remove(0);
        return message;
    }

    private List<String> getErrorList(MethodArgumentNotValidException ex) {
        return ex.getBindingResult()
                .getAllErrors()
                .stream()
                .map(ObjectError::getDefaultMessage)
                .sorted()
                .collect(Collectors.toCollection(ArrayList::new));
    }
}

Answer 1

既然您只是测试处理程序而不是调用(这是 Sping 的工作)，为什么不只使用模拟异常呢。

这样你就可以模拟你的异常需要覆盖所有路径的任何属性，而不必首先想出创建异常的方法......