public void Context()
{
validationService = new ValidationService();
ItemId itemId = ItemId.ForElement(1);
itemConstraintViolations = new[] { new ConstraintViolation(itemId, itemId, "A constraint has been violated.") };
item = new RepositoryItemBuilder().WithId(itemId).Build();
validatorMock = new Mock <IValidator>();
validatorMock.Setup(c => c.Matches(It.IsAny <RepositoryItem>())).Returns(true);
validatorMock.Setup(c => c.Validate(It.IsAny <RepositoryItem>())).Returns(itemConstraintViolations);
validationService.AddValidator(validatorMock.Object);
}