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模拟子验证程序时FluentValidation引发的NullReference异常

fluent-assertions nsubstitute fluentvalidation c#

0

Erik Philips Gabriel Costa · 技术社区 · 5 年前

从简单的事情开始:

public interface IChild
{
  string Value { get; }
}

public class ChildValidator : AbstractValidator<IChild>
{
  public ChildValidator()
  {
    RuleFor(c => c.Value)
      .NotEmpty()
      .NotEmpty()
      .WithMessage("Friendly Error Message");
  }
}

然后测试它:

static void Test_ChildValidator()
{
  var child = Substitute.For<IChild>();
  var validator = new ChildValidator();

  child.Value.Returns(null as string);
  validator.Validate(child).IsValid.Should().BeFalse();

  child.Value.Returns("");
  validator.Validate(child).IsValid.Should().BeFalse();

  child.Value.Returns("a");
  validator.Validate(child).IsValid.Should().BeTrue();
}

没有例外 .

创建父对象和验证程序:

public interface IParent
{
  IChild Child { get; }
}

public class ParentValidator : AbstractValidator<IParent>
{
  public ParentValidator(IValidator<IChild> childValidator)
  {
    When(p => p.Child != null, () => {
      RuleFor(p => p.Child)
        .SetValidator(childValidator);
    });
  }
}

然后用真正的子验证程序测试:

static void Test_ParentValidator_WithRealChildValidator()
{
  var child = Substitute.For<IChild>();
  var childValidator = new ChildValidator();

  var parent = Substitute.For<IParent>();
  var validator = new ParentValidator(childValidator);

  parent.Child.Returns(null as IChild);
  validator.Validate(parent).IsValid.Should().BeTrue();

  parent.Child.Returns(child);
  validator.Validate(parent).IsValid.Should().BeFalse();

  child.Value.Returns("a");
  validator.Validate(parent).IsValid.Should().BeTrue();
}

没有例外。

现在我尝试模拟子验证器(最终我只想确保当子对象为null或不为null时,子验证器 Validate

static void Test_ParentValidator_WithMockedChildValidator()
{
  var child = Substitute.For<IChild>();
  var childValidator = Substitute.For<IValidator<IChild>>();

  var parent = Substitute.For<IParent>();
  var validator = new ParentValidator(childValidator);

  parent.Child.Returns(null as IChild);
  validator.Validate(parent).IsValid.Should().BeTrue();

  parent.Child.Returns(child);

  childValidator.Validate(Arg.Any<IChild>())
    .Returns(
      new ValidationResult(
        new List<ValidationFailure> { new ValidationFailure("property", "message") }));
  validator.Validate(parent).IsValid.Should().BeFalse();

  childValidator.Validate(Arg.Any<IChild>())
    .Returns(new ValidationResult());
  validator.Validate(parent).IsValid.Should().BeTrue();
}

抛出 NullReferenceException

来源:“FluentValidation”

在FluentValidation.Validators.ChildValidatorAdapter.Validate(PropertyValidatorContext上下文)中

/home/jskinner/code/FluentValidation/src/FluentValidation/Validators/ChildValidatorAdaptor.cs:第56行

在FluentValidation.Internal.PropertyRule.InvokePropertyValidator(ValidationContext context,IPropertyValidator validator,String propertyName)中

/home/jskinner/code/FluentValidation/src/FluentValidation/Internal/PropertyRule.cs:第442行

在FluentValidation.Internal.PropertyRule.d\uu 65.MoveNext()

位于System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()

位于System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()

在FluentValidation.AbstractValidator 1.Validate(ValidationContext 1)在

在/home/jskinner/code/FluentValidation/src/FluentValidation/AbstractValidator.cs中的FluentValidation.AbstractValidator`1.Validate(T instance):第83行

我还需要在模拟的验证器上模拟其他东西来正确地工作吗?

pastebin - full source code

我无法在DotNetFiddle上运行此代码:(

0 回复 | 直到 5 年前

1

Nkosi 5 年前

从堆栈跟踪来看,它似乎失败了

 FluentValidation.AbstractValidator1.Validate(ValidationContext1 context)

这应该和预期的一样

[TestMethod]
public void Test_ParentValidator_WithMockedChildValidator() {
    var child = Substitute.For<IChild>();
    var childValidator = Substitute.For<IValidator<IChild>>();
    var parent = Substitute.For<IParent>();
    var validator = new ParentValidator(childValidator);
    parent.Child.Returns(null as IChild);

    validator.Validate(parent).IsValid.Should().BeTrue();

    parent.Child.Returns(child);
    var failedResult = new ValidationResult(new List<ValidationFailure> { new ValidationFailure("property", "message") });
    childValidator.Validate(Arg.Any<ValidationContext>()).Returns(failedResult);

    validator.Validate(parent).IsValid.Should().BeFalse();

    var validResult = new ValidationResult();
    childValidator.Validate(Arg.Any<ValidationContext>()).Returns(validResult);

    validator.Validate(parent).IsValid.Should().BeTrue();
}