整理

LinqStudy.Test/LinqToObject/SetsTest.cs

@@ -4,6 +4,8 @@ using System.Collections.Generic;
 using System.Linq;
 using Xunit;
 
+using System.Collections.Immutable;
+
 namespace LinqStudy.Test.LinqToObject
 {
     /// <summary>
@@ -382,15 +384,12 @@ namespace LinqStudy.Test.LinqToObject
         }
         #endregion
 
-        #region Concat
-        ///<summary>
-        /// 串联操作
-        ///<summary>
-        public class ConcatTest
-        {
+        #region 串联操作:Concat
+
         ///<summary>
         /// Concat：将两个序列合并成一个序列，不去重。与Union不同。
         ///<summary>
+        [Fact]
         public void Concat_Test()
         {
             List<Person> peoples1 = new List<Person>()
@@ -406,12 +405,10 @@ namespace LinqStudy.Test.LinqToObject
             };
 
             var concatAct = peoples1.Concat(peoples2);
-
             var totalCount = concatAct.Count();
 
             Assert.Equal(4, totalCount);
         }
-        }
         #endregion
     }
 }