public void op_Strings_stringsEmpty()
        {
            var obj = new KeyStringDictionary
            {
                new KeyStringPair("A", "1"),
                new KeyStringPair("B", "2"),
                new KeyStringPair("C", "3")
            };

            const string expected = "1,2,3";
            var          actual   = obj.Strings().Concat(",");

            Assert.Equal(expected, actual);
        }
        public void op_Move_string_string()
        {
            var obj = new KeyStringDictionary
            {
                new KeyStringPair("A", "1"),
                new KeyStringPair("B", string.Empty),
                new KeyStringPair("C", "3")
            };

            obj.Move("C", "B");

            const string expected = "1,3,";
            var          actual   = obj.Strings().Concat(',');

            Assert.Equal(expected, actual);
        }