在哪里创建 HostBuilder 并避免 'The following constructor parameters did not have matching fixture data'

Question

我采用了一个仅由 class 库和单元测试项目组成的遗留 .NET Framework 应用程序，并将它们全部转换为 .NET Core 3.1。

我似乎无法执行或 bootstrap 使用 IHostBuilder 的 CreateHostBuilder.

的 .NET 核心方法进行单元测试

当我调试我的任何单元测试时，它停止执行并且我得到这个错误：

The following constructor parameters did not have matching fixture data: IOptions`1 appConfig, IServiceX serviceX, ITemplateEngine templateEngine Exception doesn't have a stacktrace

样本单元测试：

public class TemplateGenerationTests : BaseTest
{
    private readonly AppConfiguration appConfig;
    private readonly IServiceX serviceX;
    private readonly ITemplateEngine templateEngine;

    public TemplateGenerationTests(IOptions<AppConfiguration> appConfig, IServiceX serviceX, ITemplateEngine templateEngine)
    {
        this.appConfig = appConfig.Value;
        this.serviceX = serviceX;
        this.templateEngine = templateEngine;
    }

    [Fact]
    public void SomeTestIhave()
    {
        //removed for brevity
        serviceX.DoWork(appConfig.SomeAppProp);
        

        Assert.NotNull(result);
        Assert.NotEmpty(result);
    }
}

Base class（我感觉这是创建主机构建器的错误方式）：

public class BaseTest
{
    public BaseTest()
    {
        var builder = CreateHostBuilder();
        Task.Run(() => builder.RunConsoleAsync());
    }

    public static IHostBuilder CreateHostBuilder(string[] args = null) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((hostingContext, config) =>
            {
                config.AddJsonFile("appsettings.json", optional: true);
                config.AddEnvironmentVariables();

                if (args != null)
                {
                    config.AddCommandLine(args);
                }
            })
            .ConfigureServices((hostContext, services) =>
            {
                services.AddOptions();
                services.Configure<AppConfiguration>(hostContext.Configuration.GetSection("AppConfiguration"));
                
                services.AddTransient<IServiceX, ServiceX>();
                services.AddTransient<ITemplateEngine, TemplateEngine>();
                
                //removed for brevity..
            })
            .ConfigureLogging((hostingContext, logging) =>
            {
                logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
                logging.AddConsole();
            });
}

理想情况下，我正在寻找可以设置 HostBuilder 的单点，即在控制台或 API .NET 项目中，这将在 Main 方法中Program class.

Answer 1

通过小的修改，您可以摆脱将服务注入 TemplateGenerationTests class:

BaseTest class:

public class BaseTest
{
    public BaseTest()
    {
        TestHost = CreateHostBuilder().Build();
        Task.Run(() => TestHost.RunAsync());
    }

    public IHost TestHost { get; }

    public static IHostBuilder CreateHostBuilder(string[] args = null) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((hostingContext, config) =>
            {
                config.AddJsonFile("appsettings.json", optional: true);
                config.AddEnvironmentVariables();

                if (args != null)
                {
                    config.AddCommandLine(args);
                }
            })
            .ConfigureServices((hostContext, services) =>
            {
                services.AddOptions();
                services.Configure<AppConfiguration>(hostContext.Configuration.GetSection("AppConfiguration"));

                services.AddTransient<IServiceX, ServiceX>();
                services.AddTransient<ITemplateEngine, TemplateEngine>();

                //removed for brevity..
            })
            .ConfigureLogging((hostingContext, logging) =>
            {
                logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
                logging.AddConsole();
            });
}

和 TemplateGenerationTests class:

public class TemplateGenerationTests : IClassFixture<BaseTest>
{
    private readonly IHost _host;

    public TemplateGenerationTests(BaseTest baseTest)
    {
        _host = baseTest.TestHost;
    }

    [Fact]
    public void SomeTestIhave()
    {
        // Arrange
        var serviceX = _host.Services.GetService<IServiceX>();
        var appConfig = _host.Services.GetService<AppConfiguration>();

        // Act
        var result = serviceX.DoWork(appConfig.SomeAppProp);

        // Assert
        Assert.NotNull(serviceX);
        Assert.NotEmpty(result);
    }
}

在哪里创建 HostBuilder 并避免 'The following constructor parameters did not have matching fixture data'

Where to create HostBuilder and avoid 'The following constructor parameters did not have matching fixture data'

c#

xunit

.net-core