Moq Object returns 0 for the overridden GetHashCode() present in BaseClass.

[yasirthite]

Scenario:

 public abstract class BaseEntity
    {
        public Guid Id { get; protected set; }
        
        protected BaseEntity(Guid id)
        {
            Id = id;
        }
        
        public override int GetHashCode()
        {
            return Id.GetHashCode();
        }
    }

 public abstract class BaseAuditableEntity : BaseEntity
    {
        protected BaseAuditableEntity(Guid id) : base(id)
        {
        }
    }

public abstract class AggregateRoot : BaseAuditableEntity
    {
        protected AggregateRoot(Guid id) : base(id)
        {
        }
    }

Test

[Fact]
        public void GetHashCode_ShouldReturnCorrectHashCode()
        {
            // arrange
            var id = Guid.NewGuid();
            var expectedHashCode = id.GetHashCode();
            
            var aggregateRootObject = new Mock<AggregateRoot>(id).Object;

            // act
            var actualHasCode = aggregateRootObject.GetHashCode();

            // assert
            actualHasCode.Should().Be(expectedHashCode);
        }

The aggregateRootObject.GetHashCode() returns 0. The debug control doesn't even reach GetHashCode() method body.

[stakx]

Either set your mock's CallBase property to true so it uses the base class' implementations by default, or (more granularly:) create a setup specifically for the GetHashCode method and use the .CallBase() setup verb to defer to the base class' implementation, but just for that one method.

[yasirthite]

Thank you @stakx, it does return a non-zero value now but it calls GetHashCode of the very base class (Object Class) instead of my BaseEntity class I suppose.

The execution control doesn't hit BaseEntity's GetHashCode method.

        public override int GetHashCode()
        {
            return Id.GetHashCode();
        }