Add unit test

Src/Asp.Net/SqliteTest/UnitTest/Models/Book.cs

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+using SqlSugar;
+using System.Security.Principal;
+
+namespace Test.Model
+{
+    [SugarTable("BookA01")]
+    public class Book
+    {
+        [SugarColumn(ColumnName = "Id", IsPrimaryKey = true, IsIdentity = true)]
+        public int? Id { get; set; }
+
+        [SugarColumn(ColumnName = "Name")]
+        public string Name { get; set; }
+
+        [SugarColumn(ColumnName = "PId")]
+        public int? PId { get; set; }
+    }
+}

Src/Asp.Net/SqliteTest/UnitTest/Models/Playground.cs

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+using SqlSugar;
+using System.Security.Principal;
+
+namespace Test.Model
+{
+    [SugarTable("PlaygroundA01")]
+    public class Playground
+    {
+        [SugarColumn(ColumnName = "Id", IsPrimaryKey = true, IsIdentity = true)]
+        public int? Id { get; set; }
+
+        [SugarColumn(ColumnName = "Name")]
+        public string Name { get; set; }
+
+        [SugarColumn(ColumnName = "PId")]
+        public int? PId { get; set; }
+    }
+}

Src/Asp.Net/SqliteTest/UnitTest/Models/Room.cs

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+using SqlSugar;
+using System.Security.Principal;
+
+namespace Test.Model
+{
+    [SugarTable("RoomA01")]
+    public class Room
+    {
+        [SugarColumn(ColumnName = "Id", IsPrimaryKey = true, IsIdentity = true)]
+        public int? Id { get; set; }
+
+        [SugarColumn(ColumnName = "Name")]
+        public string Name { get; set; }
+
+        [SugarColumn(ColumnName = "PId")]
+        public int? PId { get; set; }
+    }
+}

Src/Asp.Net/SqliteTest/UnitTest/Models/School.cs

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+using SqlSugar;
+using System.Collections.Generic;
+using System.Security.Principal;
+
+namespace Test.Model
+{
+    [SugarTable("SchoolA01")]
+    public class School
+    {
+        [SugarColumn(ColumnName = "Id", IsPrimaryKey = true, IsIdentity = true)]
+        public int? Id { get; set; }
+
+        [SugarColumn(ColumnName = "Name")]
+        public string Name { get; set; }
+
+        [SugarColumn(ColumnName = "PId")]
+        public int? PId { get; set; }
+
+        [Navigate(NavigateType.OneToMany, nameof(Room.PId))]
+        public List<Room> Rooms { get; set; }
+
+        [Navigate(NavigateType.OneToMany, nameof(Playground.PId))]
+        public List<Playground> Playgrounds { get; set; }
+    }
+}

Src/Asp.Net/SqliteTest/UnitTest/Models/Student.cs

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+using SqlSugar;
+using System.Collections.Generic;
+
+namespace Test.Model
+{
+    [SugarTable("StudentA01")]
+    public class Student
+    {
+        [SugarColumn(ColumnName = "Id", IsPrimaryKey = true, IsIdentity = true)]
+        public int? Id { get; set; }
+
+        [SugarColumn(ColumnName = "Name")]
+        public string Name { get; set; }
+
+        [SugarColumn(ColumnName = "Age")]
+        public string  Age { get; set; }
+
+        [Navigate(NavigateType.OneToMany, nameof(Book.PId))]
+        public List<Book> Books { get; set; }
+
+        [Navigate(NavigateType.OneToMany, nameof(School.PId))]
+        public List<School> Schools { get; set; }
+    }
+}