单元测试具有子/子类的类的FluentValidation规则

Question

当我们验证的对象具有也经过验证的子类时,是否可以为fluentvalidation类编写单元测试.

举个例子:我的班级看起来像这样

public class TestModel
{

    public class SubData
    {
        public int SubDataVal { get; set; }
    }

    public int ParentVal { get; set; }
    public SubData Sub { get; set; }

}

我的验证逻辑如下所示:

public class TestModelValidator : AbstractValidator<TestModel>
{
    public TestModelValidator()
    {
        RuleFor(o => o.ParentVal).GreaterThan(0);
        RuleFor(o => o.Sub.SubDataVal).GreaterThan(0);
    }
}

当我写下面的单元测试时

    [Test]
    public void Should_have_error_when_val_is_zero()
    {
        validator = new TestModelValidator();
        validator.ShouldHaveValidationErrorFor(model => model.ParentVal, 0);
    }

我得到一个"System.NullReferenceException:对象引用未设置为对象的实例." 来自FluentValidation.TestHelper.ValidatorTester`2.ValidateError(T instanceToValidate)的异常

(如果我删除RuleFor(o => o.Sub.SubDataVal).GreaterThan(0);行,那么它可以工作!)

同样,如果我尝试用以下单元测试实际的子类:

    [Test]
    public void Should_have_error_when_sub_dataVal_is_zero()
    {
        validator = new TestModelValidator();
        validator.ShouldHaveValidationErrorFor(model => model.Sub.SubDataVal, 0);
    }

我得到一个"System.Reflection.TargetException:Object与目标类型不匹配." 来自FluentValidation.TestHelper.ValidatorTester`2.ValidateError(T instanceToValidate)

Answer 1

您可以对模型和子模型进行单元测试,但是您需要更改验证类以使用单独的验证器类来验证子模型:

public class TestModelValidator : AbstractValidator<TestModel>
{
    public TestModelValidator()
    {
        RuleFor(o => o.ParentVal).GreaterThan(0);
        RuleFor(o => o.Sub).SetValidator(new SubDataValidator());
    }
}

public class SubDataValidator : AbstractValidator<SubData>
{
    public SubDataValidator()
    {
        RuleFor(o => o.SubDataVal).GreaterThan(0);
    }
}

然后,您可以编写单元测试来测试每个验证器或两者.

Answer 2

我得出的结论是，对于这个 ShouldHaveValidationErrorFor 无法处理子类，所以不得不手动进行。IE

    [Test]
    public void Should_have_error_when_val_is_zero()
    {
        validator = new TestModelValidator();
        TestModel testRequest = new TestModel();
        //populate with dummy data
        var result = validator.Validate(testRequest);
        Assert.That(result.Errors.Any(o => o.PropertyName== "ParentVal"));
    }