.NET Core 单元测试 - Mock IOptions<T> [英] .NET Core Unit Testing - Mock IOptions<T>

问题描述

我觉得我在这里遗漏了一些非常明显的东西.我有需要使用 .NET Core IOptions 模式(?)注入选项的类.当我对该类进行单元测试时，我想模拟各种版本的选项以验证该类的功能.有谁知道如何在 Startup 类之外正确模拟/实例化/填充 IOptions?

I feel like I'm missing something really obvious here. I have classes that require injecting of options using the .NET Core IOptions pattern(?). When I unit test that class, I want to mock various versions of the options to validate the functionality of the class. Does anyone know how to correctly mock/instantiate/populate IOptions<T> outside of the Startup class?

以下是我正在使用的类的一些示例:

Here are some samples of the classes I'm working with:

设置/选项模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace OptionsSample.Models
{
    public class SampleOptions
    {
        public string FirstSetting { get; set; }
        public int SecondSetting { get; set; }
    }
}

使用设置的待测试类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using OptionsSample.Models
using System.Net.Http;
using Microsoft.Extensions.Options;
using System.IO;
using Microsoft.AspNetCore.Http;
using System.Xml.Linq;
using Newtonsoft.Json;
using System.Dynamic;
using Microsoft.Extensions.Logging;

namespace OptionsSample.Repositories
{
    public class SampleRepo : ISampleRepo
    {
        private SampleOptions _options;
        private ILogger<AzureStorageQueuePassthru> _logger;

        public SampleRepo(IOptions<SampleOptions> options)
        {
            _options = options.Value;
        }

        public async Task Get()
        {
        }
    }
}

在与其他类不同的程序集中进行单元测试:

Unit test in a different assembly from the other classes:

using OptionsSample.Repositories;
using OptionsSample.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Xunit;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;

namespace OptionsSample.Repositories.Tests
{
    public class SampleRepoTests
    {
        private IOptions<SampleOptions> _options;
        private SampleRepo _sampleRepo;


        public SampleRepoTests()
        {
            //Not sure how to populate IOptions<SampleOptions> here
            _options = options;

            _sampleRepo = new SampleRepo(_options);
        }
    }
}

推荐答案

您需要手动创建和填充 IOptions 对象.您可以通过 Microsoft.Extensions.Options.Options 帮助器类执行此操作.例如:

You need to manually create and populate an IOptions<SampleOptions> object. You can do so via the Microsoft.Extensions.Options.Options helper class. For example:

IOptions<SampleOptions> someOptions = Options.Create<SampleOptions>(new SampleOptions());

您可以将其简化为:

var someOptions = Options.Create(new SampleOptions());

显然这不是很有用.您需要实际创建并填充 SampleOptions 对象并将其传递给 Create 方法.

Obviously this isn't very useful as is. You'll need to actually create and populate a SampleOptions object and pass that into the Create method.

这篇关于.NET Core 单元测试 - Mock IOptions<T>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！