using System; using System.Collections; namespace NUnit.Framework.Constraints { public class CollectionEquivalentConstraint : CollectionItemsEqualConstraint { private readonly IEnumerable _expected; public override string DisplayName => "Equivalent"; public override string Description => "equivalent to " + MsgUtils.FormatValue(_expected); public CollectionEquivalentConstraint(IEnumerable expected) : base(expected) { _expected = expected; } protected override bool Matches(IEnumerable actual) { if (_expected is ICollection && actual is ICollection && ((ICollection)actual).Count != ((ICollection)_expected).Count) return false; CollectionTally collectionTally = Tally(_expected); if (collectionTally.TryRemove(actual)) return collectionTally.Count == 0; return false; } public CollectionEquivalentConstraint Using<TActual, TExpected>(Func<TActual, TExpected, bool> comparison) { Using(EqualityAdapter.For(comparison)); return this; } } }