namespace NUnit.Framework.Constraints.Comparers { internal class CharsComparer : IChainComparer { private readonly NUnitEqualityComparer _equalityComparer; internal CharsComparer(NUnitEqualityComparer equalityComparer) { _equalityComparer = equalityComparer; } public bool? Equal(object x, object y, ref Tolerance tolerance, bool topLevelComparison = true) { if (!(x is char) || !(y is char)) return null; char c = (char)x; char c2 = (char)y; bool ignoreCase = _equalityComparer.IgnoreCase; char c3 = ignoreCase ? char.ToLower(c) : c; char c4 = ignoreCase ? char.ToLower(c2) : c2; return c3 == c4; } } }