How to test two objects are equal in xunit.net?

Question

I am reading Test Driven Development: By Example. All examples use Java and Junit (I am on chapter 10). There are one test method that test for equality of two objects. I already override Equals of the class but when run my test it failed. This is sample code ``` public class BaseX { public string Test { get; set; } public override bool Equals(object obj) { return this.Test == ((BaseX)obj).Test; } public override string ToString() { return string.Format("Tyep: {0}, Test: {1}", this.GetType().Name, this.Test); } } public class A : BaseX { } ``` This is my test code ``` [Fact] public void FunTest2() { var b1 = new BaseX(); var a1 = new A(); b1.Test = "a"; a1.Test = "a"; Assert.Equal(a1, b1); } ``` When I run the test, it will failed with this message. ``` TDD1.UnitTest.UnitTest1.FunTest2 : Assert.Equal() Failure Expected: Tyep: A, Test: a Actual: Tyep: BaseX, Test: a ``` I think `Assert.Equal` compare both value and type of objects. So, I looked on xunit code and found that `Assert.Equa…

Accepted Answer

Before comparing both objects using T's Equals method, xunit compares types:

```
// Same type?
if (!skipTypeCheck && x.GetType() != y.GetType())
    return false;
```

As I see it, you have two choices:

The simple choice

```
Assert.True(b1.Equals(a1));
```

It might be less expected than an Equal overload, but KISS...

The less simple choice

```
public class BaseXComparer : IEqualityComparer<BaseX>
{
    public bool Equals(BaseX x, BaseX y)
    {
        return x.Test.Equals(y.Test);
    }

public int GetHashCode(BaseX obj)
    {
        return obj.Test.GetHashCode();
    }
}
```

And then:

```
Assert.Equal(a1, b1, new BaseXComparer());
```

In this case, consider this.

Until someone will add a new overload (shouldn't be tricky, as the inner implementation has a bool parameter for this) or an extension, I'd recommend using the simple method above.

How to test two objects are equal in xunit.net?

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