c# - 使用 List、Autofixture 创建测试数据

Question

尝试让这个简单的测试工作:

public class MyClass
{
    public string Text { get; set; }
    public List<string> Comments { get; set; }

}
[TestClass]
public class UnitTest1
{
    [TestMethod]
    public void TestMethod1()
    {
        var fixture = new Fixture();
        fixture.Customize<string>(c => c.FromSeed(s => s)); //Just return propertyname, no GUID appended
        var test = fixture.Create<MyClass>();

    }
}

但是我总是报错

The decorated ISpecimenBuilder could not create a specimen based on the request: System.String. This can happen if the request represents an interface or abstract class; if this is the case, register an ISpecimenBuilder that can create specimens based on the request. If this happens in a strongly typed Build<T> expression, try supplying a factory using one of the IFactoryComposer<T> methods.`

如果我删除 Customize线，似乎工作...

不太确定我需要做什么才能让它工作

Answer 1

您可以通过自定义 Fixture 实例来创建 string 实例，而无需附加 GUID，如下所示:

public void GuidsAreNotAppendedOnStringValues()
{
    var fixture = new Fixture();
    var expected = string.Empty;
    fixture.Customizations.Add(
        new StringGenerator(() => expected));

    var actual = fixture.Create<MyClass>();

    Assert.Equal(expected, actual.Comments.Aggregate((x, y) => x + y));
}

那样 Text 属性也是 Text，而不是 Texte85e2f6f-c1a3-47c7-baf2-4756c498f523。