EqualConstraint<T>
EqualConstraint is able to compare an actual value with the
            expected value provided in its constructor. Two objects are
            considered equal if both are null, or if both have the same
            value. NUnit has special semantics for some object types.
            
                
Initializes a new instance of the  EqualConstraint class.
            
public EqualConstraint UsingPropertiesComparer(Func<PropertiesComparerConfiguration<T>, PropertiesComparerConfiguration<T>> configure)
Enables comparing a subset of instance properties.