如何使用java/spring编写ddmmYYYY验证的单元测试？

Question

    Accepting DateFormat : 01042021

>

列表项

Incorrect DateFormat : 9901042021 or 0104202199 etc.

我的日期验证代码块：

    @Value("${sms.date.format:ddMMyyyy}")
    private String DATE_FORMAT;

    public void validateDates(ReportRequest request){

        DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);

        if(StringUtils.isNotBlank(request.getStartDate())){
            try{
                dateFormat.parse(request.getStartDate());
            }catch (Exception e){
                throw new InvalidInputException("Invalid start date format, must be as : " +DATE_FORMAT);
            }
        } else {
            throw new InvalidInputException("Contract start date is empty");

        }

        if(StringUtils.isNotBlank(request.getEndDate())){
            try{
                dateFormat.parse(request.getEndDate());
            }catch (Exception e){
                throw new InvalidInputException("Invalid end date format, must be as : " +DATE_FORMAT);
            }
        } else {
            throw new InvalidInputException("Contract end date is empty");

        }
    }

我的单元测试：因为dateformat为空，所以第一行出现错误。我如何修复它？

@Value("${sms.date.format:ddMMyyyy}")
private String DATE_FORMAT;

public void testValidateDates() {


        DateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
        ReportRequest reportRequest = new ReportRequest();
        ReportRequest.setStartDate("0104202199");
        ReportRequestValidator reportRequestValidator = new ReportRequestValidator();
        ReportRequestValidator.validateDates(reportRequest);
        assertEquals("Invalid start date format, must be as : ","0104202199");

    }

我应该如何使用assert函数，条件应该是什么？

Answer 1

问题是DATE_FORMAT没有注入到您的测试类中，因此您会得到一个NullPointerExctive。

解决这个问题的两种方法

>

使用@SpringBootTest。检查一下：https://www.baeldung.com/spring-tests-override-properties

一种更干净的方法：没有任何Spring注释。这使得测试代码更加简单。只需重构代码：

// in your production code:
public class ReportRequestValidator {

  private String DATE_FORMAT;

  // package-private constructor for test 
  ReportRequestValidator (@Value("${sms.date.format:ddMMyyyy}") String dateFormat) {
     DATE_FORMAT = dateFormat;
  }

  // business logic...
 
}


// in your test code

@Rule
public ExpectedException expectedEx;

@Before
public void init() {
  expectedEx = ExpectedException.none();
}

@Test
public void testValidateDates() {
    String DATE_FORMAT = "PROVIDE_DATE_FORMAT_STRING_BY_YOURSELF";
    ReportRequest reportRequest = new ReportRequest();
    ReportRequest.setStartDate("0104202199");
    ReportRequestValidator reportRequestValidator = new ReportRequestValidator(DATE_FORMAT);    // inject DATE_FORMAT into validator

    ReportRequestValidator.validateDates(reportRequest);

    expectedEx.expect(InvalidInputException.class);
    expectedEx.expectMessage("Invalid start date format, must be as : 0104202199");
}