unit-testing - 如何在 xunit/autofixture 中组合 PropertyData 和 AutoNSubstituteData 属性？

Question

我正在使用 [AutoNSubstituteData]属性，发布在这里:

AutoFixture, xUnit.net, and Auto Mocking

我想将此与 [PropertyData("")] 结合起来来自 xunit 扩展的属性。

这是我的测试:

public static IEnumerable<string[]> InvalidInvariant
{
    get
    {
        yield return new string[] { null };
        yield return new [] { string.Empty };
        yield return new [] { " " };
    }
}

[Theory, AutoNSubstituteData, PropertyData("InvalidInvariant")]
public void TestThatGuardsAreTriggeredWhenConnectionStringArgumentIsInvalid(
    IDeal deal,
    IDbConnection conn,
    IDb db,
    ISender sender,
    string invalidConnString,
    string query)
{
    deal.Init.Group.Returns(Group.A);
    deal.Aggr.Group.Returns(Group.A);
    deal.Product.Commodity.Returns(Product.Commodity.E);

    var sut = new Handler(db, sender);
    Assert.Throws<ArgumentException>(() => 
        sut.HandleDeal(deal, conn, invalidConnString, query));
}

有没有办法组合这些属性或获得所需的功能(模拟所有内容，除了 invalidConnstring ，应该填充属性数据)？

Answer 1

有两种方法可以做到这一点:

选项 1 - 使用 AutoFixture.Xunit和 CompositeDataAttribute 类:

internal class AutoNSubstituteDataAttribute : AutoDataAttribute
{
    internal AutoNSubstituteDataAttribute()
        : base(new Fixture().Customize(new AutoNSubstituteCustomization()))
    {
    }
}

internal class AutoNSubstitutePropertyDataAttribute : CompositeDataAttribute
{
    internal AutoNSubstitutePropertyDataAttribute(string propertyName)
        : base(
            new DataAttribute[] { 
                new PropertyDataAttribute(propertyName), 
                new AutoNSubstituteDataAttribute() })
    {
    }
}

定义测试用例如下:

public class Scenario
{
    public static IEnumerable<object[]> InvalidInvariantCase1
    {
        get
        {
            yield return new string[] { null };
        }
    }

    public static IEnumerable<object[]> InvalidInvariantCase2
    {
        get
        {
            yield return new string[] { string.Empty };
        }
    }

    public static IEnumerable<object[]> InvalidInvariantCase3
    {
        get
        {
            yield return new string[] { " " };
        }
    }
}

然后将参数化测试声明为:

public class Scenarios
{
    [Theory]
    [AutoNSubstitutePropertyData("InvalidInvariantCase1")]
    [AutoNSubstitutePropertyData("InvalidInvariantCase2")]
    [AutoNSubstitutePropertyData("InvalidInvariantCase3")]
    public void AParameterizedTest(
        string invalidConnString,
        IDeal deal,
        IDbConnection conn,
        IDb db,
        ISender sender,
        string query)
    {
    }
}

请注意参数化参数 invalidConnString必须是 declared before the other parameters .

选项 2 - 使用 Exude :

public class Scenario
{
    public void AParameterizedTest(
        IDeal deal,
        IDbConnection conn,
        IDb db,
        ISender sender,
        string invalidConnString,
        string query)
    {
    }

    [FirstClassTests]
    public static TestCase<Scenario>[] RunAParameterizedTest()
    {
        var testCases = new [] 
        {
            new 
            {
                invalidConnString = (string)null
            },
            new
            {
                invalidConnString = string.Empty
            },
            new
            {
                invalidConnString = " "
            }
        };

        var fixture = new Fixture()
            .Customize(new AutoNSubstituteCustomization());

        return testCases
            .Select(tc =>
                new TestCase<Scenario>(
                    s => s.AParameterizedTest(
                        fixture.Create<IDeal>(),
                        fixture.Create<IDbConnection>(),
                        fixture.Create<IDb>(),
                        fixture.Create<ISender>(),
                        tc.invalidConnString,
                        fixture.Create<string>())))
            .ToArray();
    }
}