我在springboot中有这个验证器,当一个整数不是介于1到3之间时,它会产生错误,并且我使用addConstraintViolation从属性文件打印消息。
public class SizeValidator implements ConstraintValidator<SizeValidation, Integer> {
private int maxSize = 500;
private int minSize = 1;
@Override
public void initialize(SizeValidation constraintAnnotation) {
maxSize = constraintAnnotation.mxSize();
minSize = constraintAnnotation.minSize();
}
@Override
public boolean isValid(Integer givenSize, ConstraintValidatorContext context) {
if (givenSize > maxSize || givenSize<= minPageSize) {
addConstraintViolation(givenSize, "{Size.wrongSize.message}", context);
return false;
}
return true;
}
private void addConstraintViolation(Integer givenSize, String errorMessage, ConstraintValidatorContext context) {
final HibernateConstraintValidatorContext customContext = context.unwrap(HibernateConstraintValidatorContext.class);
customContext.addExpressionVariable("givenSize", givenSize);
context.disableDefaultConstraintViolation();
context.buildConstraintViolationWithTemplate(errorMessage)
.addConstraintViolation();
}
}在我的validation.properties里
大小为${givenSize}的
Size.wrongSize.message=Value应介于1和3之间。
我想为它编写一个参数化的junit测试,如下所示,但是它返回nullpointerexception,请问我在哪里做错了?
sizeValidator.addConstraintViolation(SizeValidator.java:33)的
java.lang.NullPointerException
intellij表示它的位置
context.buildConstraintViolationWithTemplate(errorMessage)
.addConstraintViolation();
import org.hibernate.validator.constraintvalidation.HibernateConstraintValidatorContext;
import org.junit.Test;
import org.junit.experimental.runners.Enclosed;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import javax.validation.ConstraintValidatorContext;
import java.util.Arrays;
import java.util.Collection;
import static org.junit.Assert.assertTrue;
import static org.mockito.ArgumentMatchers.anyString;
import static org.mockito.ArgumentMatchers.eq;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
@RunWith(Enclosed.class)
public class SizeValidatorTest{
@RunWith(Parameterized.class)
public static class TestValidEntries {
private SizeValidator validator = new SizeValidator();
private Integer val;
public TestValidEntries(Integer val) {
super();
this.val = val;
}
@Test
public void test() {
assertTrue(isValid(val));
}
@Parameterized.Parameters(name = "{index} Valid: {0}")
public static Collection data() {
return Arrays.asList(
-1, 501
);
}
public boolean isValid(Integer value) {
final HibernateConstraintValidatorContext context = mock(HibernateConstraintValidatorContext.class);
when(context.unwrap(HibernateConstraintValidatorContext.class)).thenReturn(context);
when(context.addExpressionVariable(eq("nonUnique"), anyString())).thenReturn(context);
when(context.getDefaultConstraintMessageTemplate()).thenReturn("template");
final ConstraintValidatorContext.ConstraintViolationBuilder builder = mock(ConstraintValidatorContext.ConstraintViolationBuilder.class);
when(context.buildConstraintViolationWithTemplate("template")).thenReturn(builder);
when(builder.addPropertyNode(anyString())).thenReturn(mock(ConstraintValidatorContext.ConstraintViolationBuilder.NodeBuilderCustomizableContext.class));
return validator.isValid(value, context);
}
}
}发布于 2021-06-21 15:55:02
问题在于context模拟的配置。
您的配置说明:
when(context
.buildConstraintViolationWithTemplate(
"template"))
.thenReturn(builder);但是在测试代码中传递的字符串是:"{Size.wrongSize.message}",因为这个字符串与模拟不匹配,因此返回null。
更好的方法是始终在测试方法的排列部分(或设置中)使用非特定的匹配器(如anyString() ),在测试方法的断言部分中,只有与Mockito.verify()一起使用特定的匹配器(或值)。
https://stackoverflow.com/questions/68070755
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