AutoFixture 构建-冻结-创建序列

Question

我刚刚注意到，每当我在 Build<>()-Create() 调用之间的夹具上执行 Freeze 时，Freeze 不会被应用。这是 AutoFixture 的预期行为还是错误？

要说清楚：

var fixture = new Fixture().Customize(new AutoMoqCustomization())
var builder = fixture.Build<SomeType>();
fixture.Freeze<Mock<ISomeInterface>>().Setup(m => m.SomeProperty).Returns(10);
var sut = builder.Create();
// if SomeType uses ISomeInterface.SomeProperty it will get 0 returned - *incorrect*

这很好用：

var fixture = new Fixture().Customize(new AutoMoqCustomization())
fixture.Freeze<Mock<ISomeInterface>>().Setup(m => m.SomeProperty).Returns(10);
var sut = fixture.Create<SomeType>();
// if SomeType uses ISomeInterface.SomeProperty it will get 10 returned - correct

Answer 1

如果您在调用生成器之前冻结，它将起作用

冻结-构建-创建序列

[TestClass]
public class AutoFixtureTests {
    [TestMethod]
    public void _FreezeBuildCreate() {
        //Arrange
        var expected = 10;
        var fixture = new Fixture().Customize(new AutoMoqCustomization());
        fixture.Freeze<Mock<ISomeInterface>>().Setup(m => m.SomeProperty).Returns(expected);
        var builder = fixture.Build<SomeType>();
        var sut = builder.Create();

        //Act
        var actual = sut.GetA();

        //Assert
        Assert.AreEqual(expected, actual);
    }

    public class SomeType {
        private ISomeInterface a;
        public SomeType(ISomeInterface a) {
            this.a = a;
        }
        public int GetA() {
            return a.SomeProperty;
        }
    }

    public interface ISomeInterface {
        int SomeProperty { get; set; }
    }
}

如果你看一下Build方法的定义

Customizes the creation algorithm for a single object, effectively turning off all Customizations on the Ploeh.AutoFixture.IFixture.

如果在冻结之前调用构建，则之后的所有自定义都不会生效。

Answer 2

这就是我自己解决这个问题的方法。由于我在选择放置 Build-Create 的位置时没有太多选择，因此不得不为此使用事件。哦，我不想让 Create 虚拟化。

这是一些伪代码：

public class BaseSutBuilder<TSut> {
    // other weird stuff...

    // somewhere in ctor:
    protected BaseSutBuilder() {
        SutBuilders = _ => {};
    }

    protected Action<ICustomizationComposer<TSut>> SutBuilders { get; }

    public TSut Create() {
        var builder = _fixture.Build<TSut>();
        SutBuilders(builder);
        return builder.Create();
    }
}

public class SomeTypeSutBuilder: BaseSutBuilder<SomeType> {
    public SomeTypeSutBuilder() {
        SutBuilders += c => c.With(.......
        SutBuilders += c => c.With(.......
    }
}

AutoFixture 构建-冻结-创建序列

AutoFixture Build-Freeze-Create sequence

c#

unit-testing

moq

autofixture