AutoFixture - 喜欢。复杂对象的比较 [英] AutoFixture - Likeness. Comparison of complex objects
问题描述
我试图比较2个复杂的对象与AutoFixture的 OfLikeness 但不幸的是没有成功。当比较嵌套对象（也与 OfLikeness ）工作原理正常，比较主对象结果与错误说，子对象不匹配。我假设问题是Likeness只应用语义比较器到主对象和嵌套对象使用默认Equal实现比较检查参考匹配（可能是我的假设是错误？）。
I am trying to compare 2 complex objects with AutoFixture's OfLikeness but unfortunately without success. While comparing nested objects( also with OfLikeness) works as expected, comparing a master object results with error saying that child objects don't match. I assume that the problem is that Likeness apply semantic comparrer only to a master object and nested objects are compared using default Equal implementation which checks for reference match(May be my assumption is wrong?).
这可以澄清我想达到的目的：
This could clarify what I am trying to achieve:
public class ComplexMasterObject{
public ChildFirst child1 {get;set;}
public ChildSecond child2 {get;set;}
public string SimpleProp {get;set;}
}
public class ChildFirst {
public string SomeStringProp1 {get;set;}
public int SomeIntProp1 {get;set;}
}
public class ChildSecond {
public string SomeStringProp1 {get;set;}
public int SomeIntProp1 {get;set;}
}
测试：
public void TestLikeness_Success()
{
var expected = new ComplexMasterObject {
Child1 = new ChildFirst {
SomeStringProp1 = "ChildFirst SomeStringProp1",
SomeIntProp1 = 1
},
Child2 = new ChildSecond {
SomeStringProp1 = "ChildSecond SomeStringProp1",
SomeIntProp1 = 2
},
SimpleProp = "ComplexMasterObject SimpleProp"
};
var input = new ComplexMasterObject {
Child1 = new ChildFirst {
SomeStringProp1 = "ChildFirst SomeStringProp1",
SomeIntProp1 = 1
},
Child2 = new ChildSecond {
SomeStringProp1 = "ChildSecond SomeStringProp1",
SomeIntProp1 = 2
},
SimpleProp = "ComplexMasterObject SimpleProp"
};
var child1Likeness = expected.Child1.AsSource().OfLikeness<ChildFirst>();
var child2Likeness = expected.Child2.AsSource().OfLikeness<ChildSecond>();
var masterLikeness = expected.AsSource().OfLikeness<ComplexMasterObject>();
child1Likeness.ShouldEqual(input.Child1); //Passes
child2Likeness.ShouldEqual(input.Child2); //Passes
masterLikeness.ShouldEqual(input);
// The provided value `ComplexMasterObject` did not match the expected value `ComplexMasterObject`. The following members did not match:
- Child1.
- Child2.
}
当我序列化 expected 和输入对象到JSON并比较结果，它们是相同的。
When I serialize expected and input objects to JSON and compare the results, they are identical.
我试图使用相似性，它也不工作：
I tried to use Resemblance, But it didn't work either:
var proxy = expected.AsSource().OfLikeness<ComplexMasterObject>().CreateProxy();
proxy.Equals(input); // returns false
如何对包含嵌套复杂属性的复杂对象执行语义比较？
How can perform a semantic comparison on complex object including nested complex properties?
提前感谢。
推荐答案
复杂的结构对象在C＃
Complex structural object-equality in C# (with classes) is most of the times cumbersome, because classes use reference equality by default.
是可能的，虽然可以执行复杂的结构化对象 - 平等，使用AutoFixture附带的语义比较包（但作为单独的NuGet包分发）。
It is possible though to perform complex structural object-equality, using the SemanticComparison package that comes with AutoFixture (but gets distributed as a separate NuGet Package).
示例： 语义比较器< T>
[Fact]
public void TestComplexClassEquality()
{
// Arrange
var value = new ComplexMasterObject
{
Child1 = new ChildFirst
{
SomeStringProp1 = "1",
SomeIntProp1 = 2
},
Child2 = new ChildSecond
{
SomeStringProp1 = "3",
SomeIntProp1 = 4
},
SimpleProp = "5"
};
var other = new ComplexMasterObject
{
Child1 = new ChildFirst
{
SomeStringProp1 = "1",
SomeIntProp1 = 2
},
Child2 = new ChildSecond
{
SomeStringProp1 = "3",
SomeIntProp1 = 4
},
SimpleProp = "5"
};
var sut =
new SemanticComparer<ComplexMasterObject>(
new MemberComparer(
new AnyObjectComparer()),
new MemberComparer(
new ChildFirstComparer()),
new MemberComparer(
new ChildSecondComparer()));
// Act
var actual = sut.Equals(value, other);
// Assert
Assert.True(actual);
}
示例： ; T> 及其相似代理
[Fact]
public void TestComplexClassEqualityResemblance()
{
// Arrange
var value = new ComplexMasterObject
{
Child1 = new ChildFirst
{
SomeStringProp1 = "1",
SomeIntProp1 = 2
},
Child2 = new ChildSecond
{
SomeStringProp1 = "3",
SomeIntProp1 = 4
},
SimpleProp = "5"
};
var other = new ComplexMasterObject
{
Child1 = new ChildFirst
{
SomeStringProp1 = "1",
SomeIntProp1 = 2
},
Child2 = new ChildSecond
{
SomeStringProp1 = "3",
SomeIntProp1 = 4
},
SimpleProp = "5"
};
var likeness =
new Likeness<ComplexMasterObject>(
value,
new SemanticComparer<ComplexMasterObject>(
new MemberComparer(
new AnyObjectComparer()),
new MemberComparer(
new ChildFirstComparer()),
new MemberComparer(
new ChildSecondComparer())));
var sut = likeness.ToResemblance();
// Act
var actual = sut.Equals(other);
// Assert
Assert.True(actual);
}
对象定义 b
public sealed class AnyObjectComparer : IEqualityComparer
{
public new bool Equals(object x, object y)
{
return object.Equals(x, y);
}
public int GetHashCode(object obj)
{
return obj.GetHashCode();
}
}
public sealed class ChildFirstComparer : IEqualityComparer
{
public new bool Equals(object x, object y)
{
var value = x as ChildFirst;
var other = y as ChildFirst;
if (value == null || other == null)
return false;
return value.SomeIntProp1 == other.SomeIntProp1
&& value.SomeStringProp1 == other.SomeStringProp1;
}
public int GetHashCode(object obj)
{
return obj.GetHashCode();
}
}
public sealed class ChildSecondComparer : IEqualityComparer
{
public new bool Equals(object x, object y)
{
var value = x as ChildSecond;
var other = y as ChildSecond;
if (value == null || other == null)
return false;
return value.SomeIntProp1 == other.SomeIntProp1
&& value.SomeStringProp1 == other.SomeStringProp1;
}
public int GetHashCode(object obj)
{
return obj.GetHashCode();
}
}
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