From fe2792e3f0c7ab87e52ab32460004aff69e2fc1a Mon Sep 17 00:00:00 2001
From: Mariusz <mpostol@cas.eu>
Date: Sat, 9 Apr 2016 22:04:38 +0200
Subject: [PATCH] #15 - added test of chain call od extension methods.

---
 Lecture/Lecture/ExtensionMethods.cs                 |  5 ++++-
 Lecture/Lesson2UnitTest/ExtensionMethodsUnitTest.cs | 10 ++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Lecture/Lecture/ExtensionMethods.cs b/Lecture/Lecture/ExtensionMethods.cs
index e347c8e7..7850b91c 100644
--- a/Lecture/Lecture/ExtensionMethods.cs
+++ b/Lecture/Lecture/ExtensionMethods.cs
@@ -13,7 +13,10 @@ public static int WordCount(this String str)
     {
       return str.Split(new char[] { ' ', '.', '?' }, StringSplitOptions.RemoveEmptyEntries).Length;
     }
-
+    public static int MethodA(this int i)
+    {
+      return -i;
+    }
     /// <summary>
     /// Determines whether [contains] [the specified value].
     /// </summary>
diff --git a/Lecture/Lesson2UnitTest/ExtensionMethodsUnitTest.cs b/Lecture/Lesson2UnitTest/ExtensionMethodsUnitTest.cs
index 3e1e461a..b7302e3a 100644
--- a/Lecture/Lesson2UnitTest/ExtensionMethodsUnitTest.cs
+++ b/Lecture/Lesson2UnitTest/ExtensionMethodsUnitTest.cs
@@ -15,6 +15,14 @@ public void InstanceCallTestMethod()
       Assert.AreEqual<int>(3, _TestString.WordCount()); //To enable extension methods for a particular type, the definition must be visible.
       Assert.AreEqual<int>(3, ExtensionMethods.WordCount(_TestString)); //Typical method call can also be in use.
     }
+    [TestMethod]
+    public void SequentialCallTestMethod()
+    {
+      string _TestString = "Hello Extension Methods";
+      int _WordCountResult = _TestString.WordCount();
+      Assert.AreEqual<int>(3, _WordCountResult);
+      Assert.AreEqual<int>(-3, _WordCountResult.MethodA());
+    }
     /// <summary>
     /// Mies the test method.
     /// </summary>
@@ -42,6 +50,8 @@ public void MyTestMethod()
       Assert.AreEqual<int>(1, (int)c.MethodA(1));           // C.MethodA(object)
       Assert.AreSame(_inputString, c.MethodA(_inputString));     // C.MethodA(object)
       Assert.AreNotSame(new AnyClass(), c.MethodA(new AnyClass()));
+
+      //How to use it 
     }
     private class AnyClass
     {