public async Task PropertyCollectionBuilder_PropertyRule()
        {
            var cos = new ChangeOfSupplier(new List <int>());

            cos.ListOfNumbers.Add(2);
            cos.ListOfNumbers.Add(5);
            cos.ListOfNumbers.Add(12);
            var ruleset = new ChangeOfSupplierRuleCollection();

            var result = await ruleset.ValidateAsync(new ValidationContext <ChangeOfSupplier>(cos), SP).ConfigureAwait(false);

            Assert.False(result.Success);
        }
 public async Task Correct_input_should_return_true()
 {
     var ruleCollection = new ChangeOfSupplierRuleCollection();