public void ExistingPropertyValuesShouldBeRewritten(PropertyValueCollection collection)
        {
            // Fixture setup
            collection.SetValues(DirectoryProperty.Member, new object[] { john, paul });

            // Exercise system
            collection.SetValues(DirectoryProperty.Member, new object[] { john, paul, ringo });

            // Verify outcome
            collection.GetValues <DN>(DirectoryProperty.Member)
            .Should().BeEquivalentTo(john, paul, ringo);
        }
        public void ManyPropertyValuesShouldBeSet(PropertyValueCollection collection)
        {
            // Fixture setup

            // Exercise system
            collection.SetValues(DirectoryProperty.Member, new object[] { john, paul });

            // Verify outcome
            collection[DirectoryProperty.Member].Should().BeEquivalentTo(john, paul);
        }