Question

I’ve been looking for a way to check two objects, but I find Equals, Assert,AreEqual and some other ones and I do not know which one I should use. Furthermore, I’ve been making my tests with the new Nunit syntax and I have a hard time finding the new syntax for comparing two objects. Here’s my test and my code:

[Test]
public void CheckForDriversSelectedMoreThanOnce_ReturnsDriversSelectedMoreThanOnceAndTheirSelectedPositions()
{
  //arrange
  Prediction prediction = new Prediction();

  Driver expected = new Driver { position = 1, name = "Michael Schumacher" };

  //act
  var actual = prediction.CheckForDriversSelectedMoreThanOnce();

  //assert
  //Assert.That(actual, Is.EqualTo(expected));
  //Assert.That(Is.Equals(actual, expected);
  Assert.AreEqual(expected, actual);
}

public Driver CheckForDriversSelectedMoreThanOnce()
{
  Driver driver = new Driver { position = 1, name = "Michael Schumacher" };
  return driver;
}

The line Assert.That(actual, Is.EqualTo(expected)); and Assert.AreEqual(expected, actual); gives me
Expected:
But was:

The other line Assert.That(Is.Equals(actual, expected); gives me:
Expected: True
But was: False

Answer 1

You may need to implement IEquatable within your Class, similiar to;

   public bool Equals(Type other)
        {
            return Name == other.Name && Position == other.Position;
        }

I had this problem occur when attempting to compare 2 objects in a linq statement using ‘Contains’ and the above resolved that.

The default implementation of instance
Equals() depends on your object type.
Reference types inherit
System.Object’s default
implementation, which is a simple
object identity (ReferenceEquals())
check. By default, reference types
will return true on instance Equals()
if and only if they are the same
object instance.

I am assuming that Assert.AreEqual(obj1, obj2) at some point does obj1.Equals(obj2), in which case they will not match.

Another option would be to Assert the actual properties, rather than matching the objects

Assert.AreEqual("Michael Schumacher", actual.Name);