Test cases for the Soundex TDD exercise. To be added (uncommented) one-by-one from the top. This is the c# version, adapted from https://github.com/jlangr/soundex.

SoundexTests.cs

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Soundex.Tests
{
    [TestClass]
    public class SoundexTests
    {
        [TestMethod]
        public void RetainsSoleLetterOfOneLetterWord()
        {
            Assert.AreEqual("A000", Soundex.Encode("A"));
        }

        [TestMethod]
        public void PadsWithZeroesToEnsureThreeDigits()
        {
            Assert.AreEqual("I000", Soundex.Encode("I"));
        }

        [TestMethod]
        public void ReplacesConsonantBWithDigit1()
        {
            Assert.AreEqual("A100", Soundex.Encode("Ab"));
        }

        [TestMethod]
        public void ReplacesConsonantCWithDigit2()
        {
            Assert.AreEqual("A200", Soundex.Encode("Ac"));
        }

        [TestMethod]
        public void ReplacesTwoConsonantsWithAppropriateDigits()
        {
            Assert.AreEqual("A340", Soundex.Encode("Adl"));
        }

        [TestMethod]
        public void ReplacesThreeConsonantsWithAppropriateDigits()
        {
            Assert.AreEqual("A256", Soundex.Encode("Ajmr"));
        }

        [TestMethod]
        public void LimitsLengthToFourCharacters()
        {
            Assert.AreEqual("D123", Soundex.Encode("Dbcdlmr"));
        }

        [TestMethod]
        public void IgnoresVowelLikeLetters()
        {
            Assert.AreEqual("C123", Soundex.Encode("CAaEeIiOoUuHhYybcd"));
        }

        [TestMethod]
        public void CombinesDuplicateEncodings()
        {
            Assert.AreEqual("G123", Soundex.Encode("Gbfcgdt"));
        }

        [TestMethod]
        public void UppercasesFirst()
        {
            Assert.AreEqual("A123", Soundex.Encode("abcd"));
        }

        [TestMethod]
        public void ReplacesConsonantsWithAppropriateDigitsIgnoresCase()
        {
            Assert.AreEqual("B234", Soundex.Encode("BCDL"));
        }

        [TestMethod]
        public void DoesNotCombineDuplicateEncodingsSeparatedByVowels()
        {
            Assert.AreEqual("J110", Soundex.Encode("Jbob"));
        }

        [TestMethod]
        public void CombinesDuplicateCodesWhen2ndLetterDuplicates1st()
        {
            Assert.AreEqual("B230", Soundex.Encode("Bbcd"));
        }

        [TestMethod]
        public void CombinesDuplicateEncodingsSeparatedByHOrW()
        {
            Assert.AreEqual("J100", Soundex.Encode("Jbwb"));
        }
    }
}