给定这些类:
public class DrumAndBassBand
{
public Drums Drum { get; set; }
public Bass Bass { get; set; }
}
public class Instrument
{
public string Name { get; set; }
public int SerialNumber { get; set; }
}
public class Drums : Instrument { }
public class Bass : Instrument { }
为什么这个测试通过...
[Fact]
public void DrumAndBassBand_Equality_Behaves_As_Expected_Version_One()
{
// arrange
var template = new Fixture().Create<DrumAndBassBand>();
// act
var createdBand = new DrumAndBassBand {Drum = template.Drum, Bass = template.Bass};
// assert
var createdLikeness = createdBand.AsSource().OfLikeness<DrumAndBassBand>()
.Without(x => x.Bass)
.CreateProxy();
createdLikeness.Drum = createdBand.Drum;
Assert.True(createdLikeness.Equals(template));
var templateLikeness = template.AsSource().OfLikeness<DrumAndBassBand>()
.Without(x => x.Bass)
.CreateProxy();
templateLikeness.Drum = template.Drum;
Assert.True(templateLikeness.Equals(createdBand));
}
...这个失败了? (区别在于 DrumAndBaseBand
实例化)
[Fact]
public void DrumAndBassBand_Equality_Behaves_As_Expected_Version_Two()
{
// arrange
var template = new Fixture().Create<DrumAndBassBand>();
// act
var createdBand =
new DrumAndBassBand
{
Drum = new Drums { Name = template.Drum.Name, SerialNumber = template.Drum.SerialNumber },
Bass = new Bass { Name = template.Bass.Name, SerialNumber = template.Bass.SerialNumber }
};
// assert
var createdLikeness = createdBand.AsSource().OfLikeness<DrumAndBassBand>()
.Without(x => x.Bass)
.CreateProxy();
createdLikeness.Drum = createdBand.Drum;
Assert.True(createdLikeness.Equals(template));
var templateLikeness = template.AsSource().OfLikeness<DrumAndBassBand>()
.Without(x => x.Bass)
.CreateProxy();
templateLikeness.Drum = template.Drum;
Assert.True(templateLikeness.Equals(createdBand));
}
最佳答案
在第二个测试中,Drum
和 Bass
实例与您尝试比较的模板不同。
您始终可以运行Likeness
(无需创建代理)并检查输出:
Test 'DrumAndBassBand_Equality_Behaves_As_Expected_Version_Two' failed:
Ploeh.SemanticComparison.LikenessException:
The provided value DrumAndBassBand did not match the expected value DrumAndBassBand.
The following members did not match:
- Drum.
这基本上意味着您必须在创建用于比较 Drum
实例的 Likeness
时提供提示。
测试的前半部分变成:
var createdLikeness = createdBand
.AsSource().OfLikeness<DrumAndBassBand>()
.With(x => x.Drum)
.EqualsWhen((s, d) => s.Drum == createdBand.Drum)
.Without(x => x.Bass)
.CreateProxy();
源目的地的 Drums
等于 other Drums
当它真的是一个 createdBand 实例 Drum
.
同样,测试的后半部分变为:
var templateLikeness = template
.AsSource().OfLikeness<DrumAndBassBand>()
.With(x => x.Drum)
.EqualsWhen((s, d) => s.Drum == template.Drum)
.Without(x => x.Bass)
.CreateProxy();
以上允许您进行非常灵活的比较(并且您始终可以进一步自定义它)。
关于autofixture - 为什么 Autofixture Likeness 的行为不像我对这两个测试之一的预期那样?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15605241/