public void KeyEncodingShouldReturnsStringOfProperLength()
        {
            var           settings     = new TestKeyConverterSettings();
            int           keyLength    = settings.Value.KeyOrder;
            IKeyConverter keyConverter = new KeyConverter(settings);

            long   originalMinValue = 0;
            long   originalMaxValue = (long)(Math.Pow(keyConverter.AlphabetSize, keyLength) - Math.Pow(keyConverter.AlphabetSize, keyLength - 1)) - 1;
            string keyMin           = keyConverter.Encode(originalMinValue);
            string keyMax           = keyConverter.Encode(originalMaxValue);

            long   exceededMaxValue = originalMaxValue + 1;
            string keyAboveMax      = keyConverter.Encode(exceededMaxValue);

            Assert.Equal(keyLength, keyMin.Length);
            Assert.Equal(keyLength, keyMax.Length);
            Assert.True(keyAboveMax.Length > keyLength);
        }
        public void KeyDecodingShouldReturnOriginalNumber()
        {
            var           settings     = new TestKeyConverterSettings();
            IKeyConverter keyConverter = new KeyConverter(settings);

            long   originalValue = 0;
            string key           = keyConverter.Encode(originalValue);

            Assert.Equal(originalValue, keyConverter.Decode(key));
        }