[英]NullReference exception throw by FluentValidation when mocking child validators
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");
}
}
然后测试一下:
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。
创建一个父对象和验证器:
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);
});
}
}
然后用一个真正的子验证器测试它:
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 Child 对象为 null 或不为 null 时,是否调用了子验证器Validate
方法)。
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”
堆栈跟踪:
在 FluentValidation.Validators.ChildValidatorAdaptor.Validate(PropertyValidatorContext context) 中
/home/jskinner/code/FluentValidation/src/FluentValidation/Validators/ChildValidatorAdaptor.cs:line 56
在 FluentValidation.Internal.PropertyRule.InvokePropertyValidator(ValidationContext context, IPropertyValidator validator, String propertyName) 中
/home/jskinner/code/FluentValidation/src/FluentValidation/Internal/PropertyRule.cs:line 442
在 FluentValidation.Internal.PropertyRule.d__65.MoveNext()
在 /home/jskinner/code/FluentValidation/src/FluentValidation/Internal/PropertyRule.cs:line 282
在 System.Linq.Enumerable.SelectManySingleSelectorIterator`2.MoveNext()
在 System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
在 FluentValidation.AbstractValidator
1.Validate(ValidationContext
1 context) 中/home/jskinner/code/FluentValidation/src/FluentValidation/AbstractValidator.cs:line 115
在 FluentValidation.AbstractValidator`1.Validate(T instance) in /home/jskinner/code/FluentValidation/src/FluentValidation/AbstractValidator.cs:line 83
在 SubValidationTest.Program.Test_ParentValidator_WithMockedChildValidator()
我还需要在模拟验证器上模拟其他东西才能使其正常工作吗?
我无法让这段代码在 DotNetFiddle 上工作(根本):(
从堆栈跟踪看来它失败了
FluentValidation.AbstractValidator1.Validate(ValidationContext1 context)
这不是模拟上配置的成员之一。
这应该按预期运行
[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();
}
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