using NUnit.Framework.Internal; using System; using System.Collections; using System.Collections.ObjectModel; using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] public class ExactCountConstraint : Constraint { private readonly int _expectedCount; [System.Runtime.CompilerServices.Nullable(2)] private readonly IConstraint _itemConstraint; public override string Description { get { object obj; if (_expectedCount != 0) { if (_expectedCount != 1) { DefaultInterpolatedStringHandler defaultInterpolatedStringHandler = new DefaultInterpolatedStringHandler(14, 1); defaultInterpolatedStringHandler.AppendLiteral("exactly "); defaultInterpolatedStringHandler.AppendFormatted(_expectedCount); defaultInterpolatedStringHandler.AppendLiteral(" items"); obj = defaultInterpolatedStringHandler.ToStringAndClear(); } else obj = "exactly one item"; } else obj = "no item"; string text = (string)obj; if (_itemConstraint == null) return text; return PrefixConstraint.FormatDescription(text, _itemConstraint); } } public ExactCountConstraint(int expectedCount) : base(Array.Empty<object>()) { _expectedCount = expectedCount; } public ExactCountConstraint(int expectedCount, IConstraint itemConstraint) : base(itemConstraint) { Guard.ArgumentNotNull(itemConstraint, "itemConstraint"); _itemConstraint = itemConstraint.Resolve(); _expectedCount = expectedCount; } public override ConstraintResult ApplyTo<[System.Runtime.CompilerServices.Nullable(2)] TActual>(TActual actual) { IEnumerable enumerable = ConstraintUtils.RequireActual<IEnumerable>(actual, "actual", false); Collection<object> collection = new Collection<object>(); int num = 0; foreach (object item in enumerable) { if (_itemConstraint != null) { if (_itemConstraint.ApplyTo(item).IsSuccess) num++; } else num++; if (collection.Count <= 10) collection.Add(item); } return new ExactCountConstraintResult(this, actual, num == _expectedCount, num, collection); } } }