<PackageReference Include="NUnit" Version="3.0.0-beta-1" />

PredicateConstraint<T>

public class PredicateConstraint<T> : Constraint
Predicate constraint wraps a Predicate in a constraint, returning success if the predicate is true.
/* Error decompiling System.String NUnit.Framework.Constraints.PredicateConstraint`1::get_Description() */