//todo move elsewhere (but has troublesome dependency on ValueTraits which is public...)
public static IEnumerable <IConstraint> ForValueSemantics <T>(Type type, Func <T>[] equalInstances,
Func <T>[] otherInstances,
IKnowWhatValueTraitsToCheck traits)
{
var constraints = new List <IConstraint>();
constraints.Add(new HasToBeAConcreteClass(type));
if (traits.RequireAllFieldsReadOnly)
{
constraints.Add(new AllFieldsMustBeReadOnly(type));
}
//bug add sealed constraint
constraints.Add(new ThereMustBeNoPublicPropertySetters(type));
constraints.Add(new MustBeSealed(type));
constraints.Add(new StateBasedEqualityWithItselfMustBeImplementedInTermsOfEqualsMethod <T>(equalInstances, otherInstances));
constraints.Add(new StateBasedEqualityMustBeImplementedInTermsOfEqualsMethod <T>(equalInstances));
constraints.Add(new StateBasedInequalityMustBeImplementedInTermsOfEqualsMethod <T>(equalInstances, otherInstances));
constraints.Add(new HashCodeMustBeTheSameForSameObjectsAndDifferentForDifferentObjects <T>(equalInstances, otherInstances));
if (traits.RequireSafeInequalityToNull)
{
constraints.Add(new InequalityWithNullMustBeImplementedInTermsOfEqualsMethod <T>(equalInstances, otherInstances));
}
if (traits.RequireEqualityAndInequalityOperatorImplementation)
{
//equality operator
constraints.Add(new StateBasedEqualityShouldBeAvailableInTermsOfEqualityOperator(type));
constraints.Add(new StateBasedEqualityMustBeImplementedInTermsOfEqualityOperator <T>(equalInstances));
constraints.Add(new StateBasedEqualityWithItselfMustBeImplementedInTermsOfEqualityOperator <T>(equalInstances, otherInstances));
constraints.Add(new StateBasedInequalityMustBeImplementedInTermsOfEqualityOperator <T>(equalInstances, otherInstances));
constraints.Add(new InequalityWithNullMustBeImplementedInTermsOfEqualityOperator <T>(equalInstances, otherInstances));
//inequality operator
constraints.Add(new StateBasedEqualityShouldBeAvailableInTermsOfInequalityOperator(type));
constraints.Add(new StateBasedEqualityMustBeImplementedInTermsOfInequalityOperator <T>(equalInstances));
constraints.Add(new StateBasedEqualityWithItselfMustBeImplementedInTermsOfInequalityOperator <T>(equalInstances, otherInstances));
constraints.Add(new StateBasedInequalityMustBeImplementedInTermsOfInequalityOperator <T>(equalInstances, otherInstances));
constraints.Add(new InequalityWithNullMustBeImplementedInTermsOfInequalityOperator <T>(equalInstances, otherInstances));
}
return(constraints);
}
public static void ShouldHaveValueSemantics(
Func <T>[] equalInstances,
Func <T>[] otherInstances,
IKnowWhatValueTraitsToCheck traits)
{
equalInstances.Should().NotBeNullOrEmpty();
otherInstances.Should().NotBeNullOrEmpty();
var type = typeof(T);
if (!ValueObjectWhiteList.Contains(type))
{
var constraints = ValueObjectConstraints
.AssertionConstraints
.ForValueSemantics(type, equalInstances, otherInstances, traits);
AssertionConstraintsEngine.TypeAdheresTo(constraints);
}
}