How to Compare two objects in unit test?

Question

public class Student
{
    public string Name { get; set; }
    public int ID { get; set; }
}

...

var st1 = new Student
{
    ID =          


        

Answer 1

1. Hello firstly add your test project Newtonsoft.Json with Nuget PM

   PM> Install-Package Newtonsoft.Json -Version 10.0.3

2. Then add test file

   using Newtonsoft.Json;
   

3. Usage:

   Assert.AreEqual(
       JsonConvert.SerializeObject(expected),
       JsonConvert.SerializeObject(actual));
   

Answer 2

Maybe you need to add an public bool Equals(object o) to the class.

Answer 3

obj1.ToString().Equals(obj2.ToString())

Answer 4

Have a look at the following link. Its a solution on code project and I have used it too. It works fine for comparing the objects in both NUnit and MSUnit

http://www.codeproject.com/Articles/22709/Testing-Equality-of-Two-Objects?msg=5189539#xx5189539xx

Answer 5

You should provide an override of Object.Equals and Object.GetHashCode:

public override bool Equals(object obj) {
    Student other = obj as Student;
    if(other == null) {
        return false;
    }
    return (this.Name == other.Name) && (this.ID == other.ID);
}

public override int GetHashCode() {
    return 33 * Name.GetHashCode() + ID.GetHashCode();
}

As for checking if two collections are equal, use Enumerable.SequenceEqual:

// first and second are IEnumerable<T>
Assert.IsTrue(first.SequenceEqual(second)); 

Note that you might need to use the overload that accepts an IEqualityComparer<T>.

Answer 6

If you use NUnit you may using this syntax and specify an IEqualityComparer specifically for the test:

[Test]
public void CompareObjectsTest()
{
    ClassType object1 = ...;
    ClassType object2 = ...;
    Assert.That( object1, Is.EqualTo( object2 ).Using( new MyComparer() ) );
}

private class MyComparer : IEqualityComparer<ClassType>
{
    public bool Equals( ClassType x, ClassType y )
    {
        return ....
    }

    public int GetHashCode( ClassType obj )
    {
        return obj.GetHashCode();
    }
}

See also here: Equal Constraint (NUnit 2.4 / 2.5)