如何在 C# 测试用例中添加模拟数据库表

Question

如何在测试用例中为单独的 class 文件创建模拟数据库表以访问服务测试用例，我还需要父子关系之间的表

 public static class MockTestData
    {
        // Test data for the DbSet<User> getter
        public static IQueryable<EaepTieriiLangComp> Langcomps
        {
            get
            {   return new List<EaepTieriiLangComp>
                {
                     new EaepTieriiLangComp{EaepAssessmentId=1,LangCompId=1,IsPrimary ="Y",LangId =1,LangReadId=1,LangWrittenId=1,LangSpokenId=1,LangUnderstandId=1 },
                     new EaepTieriiLangComp{EaepAssessmentId=2,LangCompId=1 ,IsPrimary ="N",LangId =2,LangReadId=2,LangWrittenId=2,LangSpokenId=2,LangUnderstandId=2 }//Lang =obj,LangRead=objRead,LangSpoken =objSpeak,LangWritten=objWrite,LangUnderstand=objUnderstand
                }.AsQueryable();
            }
        }
        public static IQueryable<LookupLang> LookupLangs
        {
            get
            {   return new List<LookupLang>
                {
                   new LookupLang{LangId = 1,Description = "lang1",IsActive="Y"},
                   new LookupLang{LangId = 2,Description = "lang2",IsActive="N"}
                }.AsQueryable();
            }
        }
}`

在此处输入代码` 我尝试了上述流程，但我没有得到该表的相关信息

Answer 1

如果您使用的是EF Core，您可以创建内存数据库，添加数据并进行查询。这是示例：

首先你需要安装 Microsoft.EntityFrameworkCore.InMemory 包。在此之后做出选择：

_options = new DbContextOptionsBuilder<SomeDbContext>()
            .UseInMemoryDatabase(databaseName: "DbTest")
            .Options;
using var context = new SomeDbContext(_options);
context.Database.EnsureCreated();

然后添加您的数据：

 context.AddRange(
   new LookupLang{LangId = 1,Description = "lang1",IsActive="Y"},
   new LookupLang{LangId = 2,Description = "lang2",IsActive="N"}
)

现在您可以使用上下文进行测试

Answer 2

非常感谢您建议使用 EF core.InMemory 包它现在工作正常我遵循下面的代码

内存中class

using Assessments.TierIIQueryDataModel;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Text;

namespace AssessmentCommandTest.Helpers
{
    public class InMemoryDataProviderQueryService : IDisposable
    {

       
        private bool disposedValue = false; // To detect redundant calls

        public DbQueryContext CreateContextForInMemory()
        {
            var option = new DbContextOptionsBuilder<DbQueryContext>().UseInMemoryDatabase(databaseName: "Test_QueryDatabase").Options;

            var context = new DbQueryContext(option);
            if (context != null)
            {
                //context.Database.EnsureDeleted();
                context.Database.EnsureCreated();
            }
            return context;
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!disposedValue)
            {
                if (disposing)
                {
                }

                disposedValue = true;
            }
        }

        public void Dispose()
        {
            Dispose(true);
        }
      
    }

}


and access to DbQueryContext conext file in my code and write mock tables as below

using AssessmentCommandTest.Helpers;
using Assessments.TierIIQueryDataModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace AssessmentCommandTest.MockDbTables
{
    public class MockQueryDbContext
    {
        public TierIIQueryContext MockTierIIQueryContexts()
        {

//为Inmemory DB提供者创建对象 var factory = new InMemoryDataProviderQueryService();

        //Get the instance of TierIIQueryContext
        var context = factory.CreateContextForInMemory();

        context.LookupLang.Add(new LookupLang { LangId = 1, Description = "Arabic", IsActive = "Y" });
        context.LookupLang.Add(new LookupLang { LangId = 2, Description = "Bangali", IsActive = "Y" });
        context.LookupLang.Add(new LookupLang { LangId = 3, Description = "English", IsActive = "Y" });
        context.LookupLang.Add(new LookupLang { LangId = 4, Description = "French", IsActive = "Y" });
enter code here

context.SaveChanges();
            return context;
        }
    }
}

如何在 C# 测试用例中添加模拟数据库表

How to add Mock db tables in C# test cases

xunit

servicetestcase

entity-framework-core

.net-core