ASP.NET系列：单元测试之StructureMap

2019-11-14 14:14:56

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asp.net使用StructureMap等依赖注入组件时最重要就是EntityFramework的DbContext对象要保证在每次HttPRequest只有一个DbContext实例，这里将使用第三方提供的HttpSimulator进行测试。

1.定义IDependency接口

创建屏蔽不同依赖注入组件使用差别的接口。

public interface IDependency{    void Build();    void EndRequest();    void AddTransient(Type from, Type to, object instance = null);    void AddScoped(Type from, Type to, object instance = null);    void AddSingleton(Type from, Type to, object instance = null);    object GetInstance(Type type);    IEnumerable GetAllInstances(Type type);}

2.提供StructureMap的适配类StructureMapAdapter

public class StructureMapAdapter : IDependency, IDisposable{    private bool _disposed = false;    private Container _container;    private Registry _registry;    public StructureMapAdapter()    {        this._registry = new Registry();    }    public void Build()    {        _container = new Container(_registry);    }    public void EndRequest()    {        HttpContextLifecycle.DisposeAndClearAll();    }    public void AddTransient(Type from, Type to, object instance = null)    {        if (instance == null)        {            _registry.For(from).Use(to).LifecycleIs<TransientLifecycle>();        }        else        {            _registry.For(from).Use(instance).LifecycleIs<TransientLifecycle>();        }    }    public void AddScoped(Type from, Type to, object instance = null)    {        if (instance == null)        {            _registry.For(from).Use(to).LifecycleIs<HttpContextLifecycle>();        }        else        {            _registry.For(from).Use(instance).LifecycleIs<HttpContextLifecycle>();        }    }    public void AddSingleton(Type from, Type to, object instance = null)    {        if (instance == null)        {            _registry.For(from).Use(to).LifecycleIs<SingletonLifecycle>();        }        else        {            _registry.For(from).Use(instance).LifecycleIs<SingletonLifecycle>();        }    }    public object GetInstance(Type type)    {        return _container.GetInstance(type);    }    public IEnumerable GetAllInstances(Type type)    {        return _container.GetAllInstances(type);    }    public void Dispose()    {        Dispose(true);        GC.SuppressFinalize(this);    }    protected virtual void Dispose(bool disposing)    {        if (!_disposed)        {            if (disposing)            {                this._container.Dispose();            }            _disposed = true;        }    }}

3.使用HttpSimulator进行单元测试

public class StructureMapAdapterTest{    [Fact]    public void TransientTest()    {        IDependency dependency = new StructureMapAdapter();        dependency.AddTransient(typeof(ITest), typeof(Test));        dependency.Build();        var version1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        var version2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        Assert.NotEqual(version1, version2);    }    [Fact]    public void SingletonTest()    {        IDependency dependency = new StructureMapAdapter();        dependency.AddSingleton(typeof(ITest), typeof(Test));        dependency.Build();        var version1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        var version2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        Assert.Equal(version1, version2);    }    [Fact]    public void ScopedTest()    {        var version1 = "";        var version2 = "";        using (HttpSimulator simulator = new HttpSimulator())        {            IDependency dependency = new StructureMapAdapter();            dependency.AddScoped(typeof(ITest), typeof(Test));            dependency.Build();            simulator.SimulateRequest(new Uri("http://localhost/"));            version1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;            version2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;            Assert.Equal(version1, version2);        }        using (HttpSimulator simulator = new HttpSimulator())        {            IDependency dependency = new StructureMapAdapter();            dependency.AddScoped(typeof(ITest), typeof(Test));            dependency.Build();            simulator.SimulateRequest(new Uri("http://localhost/"));            version1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        }        using (HttpSimulator simulator = new HttpSimulator())        {            IDependency dependency = new StructureMapAdapter();            dependency.AddScoped(typeof(ITest), typeof(Test));            dependency.Build();            simulator.SimulateRequest(new Uri("http://localhost/"));            version2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;        }        Assert.NotEqual(version1, version2);    }}public interface ITest{    String Version { get; }}public class Test : ITest{    private string _version = Guid.NewGuid().ToString();    public string Version { get { return this._version; } }}