IEqualWithUsingConstraint<T> public interface IEqualWithUsingConstraint<T> Interface for equal constraints which support user comparisons. Documentation Code using NUnit.Framework.Constraints; using System.Runtime.CompilerServices; namespace NUnit.Framework { [NullableContext(2)] public interface IEqualWithUsingConstraint<T> { [Nullable(1)] T Expected { [NullableContext(1)] get; } ConstraintBuilder Builder { get; set; } } }