public void Constructor_NullSettingsPassed_Throws()
        {
            IArticleSettings nullSettings = null;

            var exception = Assert.Catch <ArgumentNullException>(
                () => new RawArticleToArticleMapper(nullSettings));
        }
        public RawArticleToArticleMapper(IArticleSettings settings)
        {
            if (settings == null)
            {
                throw new ArgumentNullException(nameof(settings));
            }

            this.settings = settings;
        }