Added twelve days exercise

EXERCISES.txt

@@ -10,3 +10,4 @@ phone-number
 robot-name
 sum-of-multiples
 meetup
+twelve-days

twelve-days/Example.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+public class TwelveDaysSong
+{
+    public string Sing()
+    {
+        return Verses(1, 12);
+    }
+
+    public string Verse(int verseNumber)
+    {
+        switch(verseNumber)
+        {
+            case 1:
+              return "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n";
+            case 2:
+              return "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 3:
+              return "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 4:
+              return "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 5:
+              return "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 6:
+              return "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 7:
+              return "On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 8:
+              return "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 9:
+              return "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 10:
+              return "On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 11:
+              return "On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            case 12:
+              return "On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+            default:
+              return "";
+        }
+    }
+
+    public string Verses(int start, int end)
+    {
+        var stringBuilder = new StringBuilder();
+
+        Enumerable.Range(start, end).ToList().ForEach(i => stringBuilder.Append(Verse(i)).Append("\n"));
+
+        return stringBuilder.ToString();
+    }
+}

twelve-days/TwelveDaysTest.cs

@@ -0,0 +1,138 @@
+using NUnit.Framework;
+
+[TestFixture]
+public class TwelveDaysTest
+{
+    private TwelveDaysSong twelveDaysSong;
+
+    [SetUp]
+    public void Setup()
+    {
+        twelveDaysSong = new TwelveDaysSong();
+    }
+
+    [Test]
+    public void Return_Verse_1()
+    {
+        var expected = "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(1), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_2()
+    {
+        var expected = "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(2), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_3()
+    {
+        var expected = "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(3), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_4()
+    {
+        var expected = "On the fourth day of Christmas my true love gave to me, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(4), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_5()
+    {
+        var expected = "On the fifth day of Christmas my true love gave to me, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(5), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_6()
+    {
+        var expected = "On the sixth day of Christmas my true love gave to me, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(6), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_7()
+    {
+        var expected = "On the seventh day of Christmas my true love gave to me, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(7), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_8()
+    {
+        var expected = "On the eighth day of Christmas my true love gave to me, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(8), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_9()
+    {
+        var expected = "On the ninth day of Christmas my true love gave to me, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(9), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_10()
+    {
+        var expected = "On the tenth day of Christmas my true love gave to me, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(10), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_11()
+    {
+        var expected = "On the eleventh day of Christmas my true love gave to me, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(11), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Verse_12()
+    {
+        var expected = "On the twelfth day of Christmas my true love gave to me, twelve Drummers Drumming, eleven Pipers Piping, ten Lords-a-Leaping, nine Ladies Dancing, eight Maids-a-Milking, seven Swans-a-Swimming, six Geese-a-Laying, five Gold Rings, four Calling Birds, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n";
+
+        Assert.That(twelveDaysSong.Verse(12), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Multiple_Verses()
+    {
+        var expected = "On the first day of Christmas my true love gave to me, a Partridge in a Pear Tree.\n\n" +
+          "On the second day of Christmas my true love gave to me, two Turtle Doves, and a Partridge in a Pear Tree.\n\n" +
+          "On the third day of Christmas my true love gave to me, three French Hens, two Turtle Doves, and a Partridge in a Pear Tree.\n\n";
+
+        Assert.That(twelveDaysSong.Verses(1, 3), Is.EqualTo(expected));
+    }
+
+    [Test]
+    [Ignore]
+    public void Return_Entire_Song()
+    {
+        Assert.That(twelveDaysSong.Verses(1, 12), Is.EqualTo(twelveDaysSong.Sing()));
+    }
+}