From 77ee2d268d9ae2fad1893e5ad0488a2757ccdf12 Mon Sep 17 00:00:00 2001
From: Rafael Escoto <rafael.escoto@hotmail.com>
Date: Tue, 2 Oct 2018 13:35:51 +0200
Subject: [PATCH] Adding ToHashSet Method

---
 ShittyLINQ/ToHashSet.cs           | 22 ++++++++++++++++++++++
 ShittyLinqTests/ToHashSetTests.cs | 27 +++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 ShittyLINQ/ToHashSet.cs
 create mode 100644 ShittyLinqTests/ToHashSetTests.cs

diff --git a/ShittyLINQ/ToHashSet.cs b/ShittyLINQ/ToHashSet.cs
new file mode 100644
index 0000000..01cd198
--- /dev/null
+++ b/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);
+        }
+    }
+}
diff --git a/ShittyLinqTests/ToHashSetTests.cs b/ShittyLinqTests/ToHashSetTests.cs
new file mode 100644
index 0000000..abf25ff
--- /dev/null
+++ b/ShittyLinqTests/ToHashSetTests.cs
@@ -0,0 +1,27 @@
+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);
+        }
+    }
+}