From 4623c69c695678c2bd7c78e323d0a93eda7d19c1 Mon Sep 17 00:00:00 2001
From: Jason Zhu <jasonzhuyq@outlook.com>
Date: Mon, 22 Feb 2021 10:37:35 +0000
Subject: [PATCH] Finished Using Multi-cast Delegates

---
 gradebook/test/GradeBook.Tests/TypeTests.cs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gradebook/test/GradeBook.Tests/TypeTests.cs b/gradebook/test/GradeBook.Tests/TypeTests.cs
index db76876..f98c9a1 100644
--- a/gradebook/test/GradeBook.Tests/TypeTests.cs
+++ b/gradebook/test/GradeBook.Tests/TypeTests.cs
@@ -9,18 +9,28 @@ namespace GradeBook.Tests
 
     public class TypeTests
     {
+        int count = 0;
+
         [Fact]
         public void WriteLogDelegateCanPointToMethod()
         {
             string msg = "test";
 
             WriteLogDelegate log = new WriteLogDelegate(ReturnMessage); // Instantiate a delegate
+            log += ReturnMessage2; // Multi-cast delegate
             var result = log(msg); // Invoking a delegate
             Assert.Equal(result, msg);
+            Assert.Equal(count, 2);
         }
 
         string ReturnMessage(string message)
         {
+            count += 1;
+            return message;
+        }
+        string ReturnMessage2(string message)
+        {
+            count += 1;
             return message;
         }