#71 Adding ToHashSet Method

ShittyLINQ/ToHashSet.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ShittyLINQ
+{
+    public static partial class Extensions
+    {
+        /// <summary>
+        /// Returns a <see cref="HashSet{T}"/> of the source items.
+        /// </summary>
+        /// <typeparam name="T">Type of elements in source sequence.</typeparam>
+        /// <param name="source">Source sequence</param>
+        /// <returns>A hash set of the items in the sequence.</returns>
+        /// <exception cref="ArgumentNullException"><paramref name="source"/> is null</exception>
+        public static HashSet<T> ToHashSet<T>(this IEnumerable<T> source)
+        {
+            if (source == null) throw new ArgumentNullException();
+            return new HashSet<T>(source);
+        }
+    }
+}

ShittyLinqTests/ToHashSetTests.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using ShittyLINQ;
+using ShittyTests.TestHelpers;
+using System;
+using System.Collections.Generic;
+
+namespace ShittyLinqTests
+{
+    [TestClass]
+    public class ToHashSetTests
+    {
+        [TestMethod]
+        public void ToHashSet_SequenceIsNull()
+        {
+            IEnumerable<int> nums = null;
+            Assert.ThrowsException<ArgumentNullException>(() => nums.ToHashSet());
+        }
+
+        [TestMethod]
+        public void ToHashSet_SequenceEquals()
+        {
+            var expected = new int[] { 0, 1, 2 };
+            var actual = expected.ToHashSet();
+            TestHelper.AssertCollectionsAreSame(expected, actual);
+        }
+    }
+}