如何对调用 IConfiguration.Get<T> 的方法进行单元测试延期 [英] How to Unit Test Method Calling IConfiguration.Get<T> extension

问题描述

我有一个非常简单的方法需要进行单元测试.

I have this very simple method that I need to unit test.

public static class ValidationExtensions
{
    public static T GetValid<T>(this IConfiguration configuration)
    {
        var obj = configuration.Get<T>();
        Validator.ValidateObject(obj, new ValidationContext(obj), true);
        return obj;
    }
}

问题在于configuration.Get是一个静态扩展方法，不属于IConfiguration.我无法更改该静态方法的实现.

The problem is that configuration.Get<T> is a static extension method and doesn't belong to IConfiguration. I can't change the implementation of that static method.

我在想，也许最简单的方法是创建一个内存配置提供程序?但是我不知道我是否可以在不将其绑定到网络主机的情况下创建一个.

I'm thinking, perhaps the simplest way is to create a Memory Configuration Provider? But I don't know if I can create one without binding it to a web host.

推荐答案

配置模块独立于 Web 主机相关功能.

The configuration module is independent of web host related features.

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.

You should be able to create an in memory configuration to test against without the need to bind it to a web host.

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功能来隔离扩展方法的测试.

This in my opinion would be coming close to an integration test, but ideally you are just using framework dependent features in order to isolate the testing of the extension method.

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