Add unit test

Src/Asp.Net/MySqlTest/MySqlTest.csproj

@@ -86,6 +86,7 @@
     <Compile Include="Models\Unit\Custom1\PurchaseDetailModel.cs" />
     <Compile Include="Models\ViewOrder.cs" />
     <Compile Include="Demo\DemoJ_Report.cs" />
+    <Compile Include="UnitTest\UCustom20.cs" />
     <Compile Include="UnitTest\UBulkCopy2.cs" />
     <Compile Include="UnitTest\UCustom07.cs" />
     <Compile Include="UnitTest\UDelete.cs" />

Src/Asp.Net/MySqlTest/UnitTest/Main.cs

@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UCustom20.Init();
             UCustom07.Init();
             UnitTestReturnPkList.Init();
             UnitSameKeyBug.Init();

Src/Asp.Net/MySqlTest/UnitTest/UCustom20.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest
+{
+    public class UCustom20
+    {
+        public static void Init()
+        {
+            var db = NewUnitTest.Db;
+            db.DbMaintenance.TruncateTable<Order>();
+            db.Insertable(new Order() { Id = 1, Name = "jack", CreateTime = DateTime.Now, CustomId = 1 }).ExecuteCommand();
+           
+            var test8 = db.Queryable<Order>()
+                .LeftJoin<Order>((x, y) => x.Id == y.Id)
+               .Take(2)
+                .Select((x, y) => new TestDTO
+                {
+                    SubOne = new TestSubDTO { NameOne = false, NameTwo = x.Name }
+                })
+               .ToList();
+
+            if (test8.First().SubOne.NameOne != false || test8.First().SubOne.NameTwo != "jack")
+            {
+                throw new Exception("unit error");
+            }
+        }
+
+        public class TestDTO
+        {
+            public TestSubDTO SubOne { get; set; }
+
+            public TestSubDTO SubTwo { get; set; }
+        }
+
+        public class TestSubDTO
+        {
+            public bool NameOne { get; set; }
+
+            public string NameTwo { get; set; }
+        }
+    }
+}