From bbbd2d153608179bf26161cf239b654962014db7 Mon Sep 17 00:00:00 2001
From: poune05 <poune05@hotmail.com>
Date: Sat, 20 Oct 2018 21:33:24 +0200
Subject: [PATCH] Add Prepend method and tests #56

---
 ShittyLINQ/Prepend.cs           | 21 +++++++++++++++++++++
 ShittyLinqTests/PrependTests.cs | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 ShittyLINQ/Prepend.cs
 create mode 100644 ShittyLinqTests/PrependTests.cs

diff --git a/ShittyLINQ/Prepend.cs b/ShittyLINQ/Prepend.cs
new file mode 100644
index 0000000..9d14c4b
--- /dev/null
+++ b/ShittyLINQ/Prepend.cs
@@ -0,0 +1,21 @@
+namespace ShittyLINQ
+{
+    using System;
+    using System.Collections.Generic;
+
+    public static partial class Extensions
+    {
+        public static IEnumerable<T> Prepend<T>(this IEnumerable<T> source, T element)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            yield return element;
+
+            foreach (var item in source)
+            {
+                yield return item;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/ShittyLinqTests/PrependTests.cs b/ShittyLinqTests/PrependTests.cs
new file mode 100644
index 0000000..d52942d
--- /dev/null
+++ b/ShittyLinqTests/PrependTests.cs
@@ -0,0 +1,32 @@
+namespace ShittyTests
+{
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using ShittyLINQ;
+    using ShittyTests.TestHelpers;
+
+    [TestClass]
+    public class PrependTests
+    {
+        [TestMethod]
+        public void Prepend_ReturnsExpected()
+        {
+            var source = new[] { 1, 2, 3, 4, 5 };
+            var expectedResult = new[] { 0, 1, 2, 3, 4, 5 };
+
+            var result = source.Prepend(0);
+
+            TestHelper.AssertCollectionsAreSame(expectedResult, result);
+        }
+
+        [TestMethod]
+        public void Prepend_ReturnsExpectedWithEmptyCollection()
+        {
+            var source = new int[] { };
+            var expectedResult = new int[] { 0 };
+
+            var result = source.Prepend(0);
+
+            TestHelper.AssertCollectionsAreSame(expectedResult, result);
+        }
+    }
+}
\ No newline at end of file