Add test for BinarySearcher class

Author: kdimolikas

UnitTest/AlgorithmsTests/BinarySearcherTest.cs

@@ -0,0 +1,64 @@
+using System.Collections.Generic;
+using Xunit;
+using Algorithms.Search;
+
+namespace UnitTest.AlgorithmsTests
+{
+    public static class BinarySearcherTest
+    {
+
+
+        [Fact]
+        public static void MergeSortTest()
+        {
+            //a list of int
+            IList<int> list = new List<int> {9, 3, 7, 1, 6, 10};
+          
+            IList<int> sortedList = BinarySearcher.MergeSort<int>(list);
+            IList<int> expectedList = new List<int> { 1, 3, 6, 7, 9, 10 };
+
+            Assert.Equal(expectedList, sortedList);
+
+            //a list of strings
+            IList<string> animals = new List<string> {"lion", "cat", "tiger", "bee"};
+            IList<string> sortedAnimals = BinarySearcher.MergeSort<string>(animals);
+            IList<string> expectedAnimals = new List<string> {"bee", "cat", "lion", "tiger"};
+            
+            Assert.Equal(expectedAnimals, sortedAnimals);
+
+        }
+
+
+        [Fact]
+        public static void BinarySearchTest()
+        {
+            //list of ints
+            IList<int> list = new List<int> { 9, 3, 7, 1, 6, 10 };
+            IList<int> sortedList = BinarySearcher.MergeSort<int>(list);
+
+            int itemIndex = BinarySearcher.BinarySearch<int>(list, 6);
+            int expectedIndex = sortedList.IndexOf(6);
+
+            Assert.Equal(expectedIndex, itemIndex);
+
+            //list of strings
+            IList<string> animals = new List<string> {"lion", "cat", "tiger", "bee", "sparrow"};
+            IList<string> sortedAnimals = BinarySearcher.MergeSort<string>(animals);
+
+            int actualIndex = BinarySearcher.BinarySearch<string>(animals, "cat");
+            int expectedAnimalIndex = sortedAnimals.IndexOf("cat");
+
+            Assert.Equal(expectedAnimalIndex, actualIndex);
+
+        }
+
+
+        [Fact]
+        public static void NullCollectionExceptionTest()
+        {
+            IList<int> list = null;
+            Assert.Throws<System.NullReferenceException>(() => BinarySearcher.BinarySearch<int>(list,0));
+        }
+
+    }
+}