public void RemoveByKey_KeyNotExists_ReturnsFalse()
        {
            var dctIntStr = new DictionaryImplementedWithList <int, string>();

            dctIntStr.Add(1, "a");
            dctIntStr.Remove(2).Should().BeFalse();
        }
        public void RemoveItem_ItemNotExists_ReturnsFalse()
        {
            var dctIntStr = new DictionaryImplementedWithList <int, string>();

            dctIntStr.Add(1, "a");
            dctIntStr.Remove(new KeyValuePair <int, string>(2, "a")).Should().BeFalse();
        }