Initial data commit

Task/FizzBuzz/C-sharp/fizzbuzz-9.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace FizzBuzz
+{
+    [TestClass]
+    public class FizzBuzzTest
+    {
+        private FizzBuzz fizzBuzzer;
+
+        [TestInitialize]
+        public void Initialize()
+        {
+            fizzBuzzer = new FizzBuzz();
+        }
+
+        [TestMethod]
+        public void Give4WillReturn4()
+        {
+            Assert.AreEqual("4", fizzBuzzer.FizzBuzzer(4));
+        }
+
+        [TestMethod]
+        public void Give9WillReturnFizz()
+        {
+            Assert.AreEqual("Fizz", fizzBuzzer.FizzBuzzer(9));
+        }
+
+        [TestMethod]
+        public void Give25WillReturnBuzz()
+        {
+            Assert.AreEqual("Buzz", fizzBuzzer.FizzBuzzer(25));
+        }
+
+        [TestMethod]
+        public void Give30WillReturnFizzBuzz()
+        {
+            Assert.AreEqual("FizzBuzz", fizzBuzzer.FizzBuzzer(30));
+        }
+
+        [TestMethod]
+        public void First15()
+        {
+            ICollection expected = new ArrayList
+                {"1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz", "11", "Fizz", "13", "14", "FizzBuzz"};
+
+            var actual = Enumerable.Range(1, 15).Select(x => fizzBuzzer.FizzBuzzer(x)).ToList();
+
+            CollectionAssert.AreEqual(expected, actual);
+        }
+
+        [TestMethod]
+        public void From1To100_ToShowHowToGet100()
+        {
+            const int expected = 100;
+            var actual = Enumerable.Range(1, 100).Select(x => fizzBuzzer.FizzBuzzer(x)).ToList();
+
+            Assert.AreEqual(expected, actual.Count);
+        }
+    }
+
+    public class FizzBuzz
+    {
+        private delegate string Xzzer(int value);
+        private readonly IList<Xzzer> _functions = new List<Xzzer>();
+
+        public FizzBuzz()
+        {
+            _functions.Add(x => x % 3 == 0 ? "Fizz" : "");
+            _functions.Add(x => x % 5 == 0 ? "Buzz" : "");
+        }
+
+        public string FizzBuzzer(int value)
+        {
+            var result = _functions.Aggregate(String.Empty, (current, function) => current + function.Invoke(value));
+            return String.IsNullOrEmpty(result) ? value.ToString(CultureInfo.InvariantCulture) : result;
+        }
+    }
+}