如何单元测试方法调用 IConfiguration.Get<T> 扩展

4回答

慕码人2483693

配置模块独立于网络主机相关功能。您应该能够创建一个内存配置来进行测试，而无需将其绑定到 Web 主机。查看以下示例测试public class TestConfig {    [Required]    public string SomeKey { get; set; }    [Required] //<--NOTE THIS    public string SomeOtherKey { get; set; }}//...[Fact]public void Should_Fail_Validation_For_Required_Key() {    //Arrange    var inMemorySettings = new Dictionary<string, string>    {        {"Email:SomeKey", "value1"},        //{"Email:SomeOtherKey", "value2"}, //Purposely omitted for required failure        //...populate as needed for the test    };    IConfiguration configuration = new ConfigurationBuilder()        .AddInMemoryCollection(inMemorySettings)        .Build();    //Act    Action act = () => configuration.GetSection("Email").GetValid<TestConfig>();    //Assert    ValidationException exception = Assert.Throws<ValidationException>(act);    //...other assertions of validation results within exception object}在我看来，这将接近于集成测试，但理想情况下，您只是使用依赖于框架的特性来隔离扩展方法的测试。

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Helenr

大多数模拟库（Moq、FakeItEasy 等）都不能模拟扩展方法。因此，您必须以 aIConfiguration.Get<T>返回 T 实例的方式“填充”您的 IConfiguration。Nkoski 答案适用于很多场景，但如果您需要测试调用的代码，IConfiguration.Get<T>则可以使用下面的示例：using System;using System.IO;using System.Text;using System.Text.Json;using System.Collections.Generic;using Microsoft.Extensions.Configuration;using Xunit;public class TestClass {    public class Movie    {        public string Name { get; set; }        public decimal Rating { get; set; }        public IList<string> Stars { get; set; } //it works with collections    }    [Fact]    public void MyTest()    {        var movie = new Movie {             Name = "Some Movie",            Rating = 9,             Stars = new List<string>{"Some actress", "Some actor"}        };        var movieAsJson = Encoding.UTF8.GetBytes(JsonSerializer.Serialize(movie));        using(var stream = new MemoryStream(movieAsJson))        {            var config = new ConfigurationBuilder().AddJsonStream(stream).Build();            var movieFromConfig = config.Get<Movie>();            //var sut = new SomeService(config).SomeMethodThatCallsConfig.Get<Movie>()        }    }}

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吃鸡游戏

解决问题的一种略有不同的方法，避免了 Mock 和大量设置噪音：InMemoryConfiguration几乎给了我我需要的东西，所以我对其进行了扩展，以便您可以在构建配置后修改值（我的情况是我在构建配置时不知道所有模拟值）https://gist.github.com/martinsmith1968/9567de76d2bbe537af05d76eb39b1162底部的单元测试显示用法

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慕田峪7331174

[TestClass]public class UnitTest1{    [TestMethod]    public void TestMethod1()    {        IConfiguration mock = new MockConfiguration();        var simpleObject = mock.GetValid<SimpleObject>();        Assert.AreEqual(simpleObject.MyConfigStr, "123");    }}public class SimpleObject{    public string MyConfigStr { get; set; }}public class MockConfiguration : IConfiguration{    public IConfigurationSection GetSection(string key)    {        return new MockConfigurationSection()        {            Value = "123"        };    }    public IEnumerable<IConfigurationSection> GetChildren()    {        var configurationSections = new List<IConfigurationSection>()        {            new MockConfigurationSection()            {                Value = "MyConfigStr"            }        };        return configurationSections;    }    public Microsoft.Extensions.Primitives.IChangeToken GetReloadToken()    {        throw new System.NotImplementedException();    }    public string this[string key]    {        get => throw new System.NotImplementedException();        set => throw new System.NotImplementedException();    }}public class MockConfigurationSection : IConfigurationSection{    public IConfigurationSection GetSection(string key)    {        return this;    }    public IEnumerable<IConfigurationSection> GetChildren()    {        return new List<IConfigurationSection>();    }    public IChangeToken GetReloadToken()    {        return new MockChangeToken();    }    public string this[string key]    {        get => throw new System.NotImplementedException();        set => throw new System.NotImplementedException();    }    public string Key { get; }    public string Path { get; }    public string Value { get; set; }}public class MockChangeToken : IChangeToken{    public IDisposable RegisterChangeCallback(Action<object> callback, object state)    {        return new MockDisposable();    }    public bool HasChanged { get; }    public bool ActiveChangeCallbacks { get; }}public class MockDisposable : IDisposable{    public void Dispose()    {    }}为 IConfiguration 创建了一个模拟并模仿 ConfigBinder 的行为using Microsoft.Extensions.Configuration;using Microsoft.Extensions.Primitives;添加了这两个名称空间以进行编译

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