using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] public abstract class PrefixConstraint : Constraint { protected IConstraint BaseConstraint { get; } protected string DescriptionPrefix { get; } public override string Description => FormatDescription(DescriptionPrefix, BaseConstraint); protected PrefixConstraint(IResolveConstraint baseConstraint, string descriptionPrefix) : base(baseConstraint) { Guard.ArgumentNotNull(baseConstraint, "baseConstraint"); BaseConstraint = baseConstraint.Resolve(); DescriptionPrefix = descriptionPrefix; } internal static string FormatDescription(string descriptionPrefix, IConstraint baseConstraint) { return string.Format((baseConstraint is EqualConstraint) ? "{0} equal to {1}" : "{0} {1}", descriptionPrefix, baseConstraint.Description); } } }