public void ListIsNullIsValid()
{
// passing null (IList) to isvalid should be ok
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(100, "Value", null);
attr.IsValid(null).Should().BeTrue();
}
public void UsedOnInvalidTypeShouldThrow()
{
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(5, "Value", null);
Action act = () => attr.IsValid("NotAnIListType");
act.ShouldThrow <InvalidOperationException>().WithMessage("Attribute used on a type that doesn't implement IList.");
}
public void InvalidLengthShouldThrow()
{
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(-100, "Value", null);
Action act = () => attr.IsValid("some text");
act.ShouldThrowExactly <InvalidOperationException>("Invalid length value defined (zero or less than -1 (negative one is magic value in .net framework implementation)).");
}
public void ListIsEmptyInvalidLengthShouldThrow()
{
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(-100, "Value", null);
Action act = () => attr.IsValid(new List <string>());
act.ShouldThrowExactly <InvalidOperationException>().WithMessage("ListPropertyMaxLengthAttribute must have a length value that is greater than zero.", "Because length attribute is negative.");
}
public void PublicIsValidAndProtectedIsValidShouldWorkTheSame()
{
// COMMENT: background, for example .Net framework MaxLengthAttribute is implemneted in public IsValid method
// out inherited attribute was implemented in protected IsValid so that means we have two different implementations that work differently
// public IsValid(object) and protected IsValid(object, validationContext) should result in same
// public isvalid validates string length or collection count, custom implementation validate list objects string length
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(2, "String");
List <SomeDemoObject> inValues = new List <SomeDemoObject>()
{
new SomeDemoObject()
{
Integer = 1,
String = "a"
},
new SomeDemoObject()
{
Integer = 2,
String = "ab"
},
new SomeDemoObject()
{
Integer = 3,
String = "cb"
}
};
// this call actually currently checks that there are at maximum 2 items in the list and returns fale because there are 3 items in the list
bool publicIsValid = attr.IsValid(inValues);
MaxLengthTestObject obj = new MaxLengthTestObject(inValues);
ValidationContext ctx = new ValidationContext(obj);
ctx.MemberName = "ValuesList";
List <ValidationResult> validationResults = new List <ValidationResult>();
Validator.TryValidateProperty(inValues, ctx, validationResults).Should().Be(publicIsValid, "Public and protected IsValid methods should result to the same outcome.");
}
public void ListIsEmptyIsValid()
{
ListPropertyMaxLengthAttribute attr = new ListPropertyMaxLengthAttribute(100, "Value", null);
attr.IsValid(new List <string>()).Should().BeTrue();
}