using NUnit.Framework.Internal; using System; using System.Reflection; using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints.Comparers { [NullableContext(1)] [Nullable(0)] internal static class EqualsComparer { private static readonly Type[] EqualsObjectParameterTypes = new Type[1] { typeof(object) }; public static EqualMethodResult Equal(object x, object y, ref Tolerance tolerance, ComparisonState state, NUnitEqualityComparer equalityComparer) { if (equalityComparer.CompareAsCollection && state.TopLevelComparison) return EqualMethodResult.TypesNotSupported; Type type = x.GetType(); if (equalityComparer.CompareProperties && type.HasCompilerGeneratedEquals()) return EqualMethodResult.TypesNotSupported; if (OverridesEqualsObject(type)) { if (tolerance.HasVariance) return EqualMethodResult.ToleranceNotSupported; if (!x.Equals(y)) return EqualMethodResult.ComparedNotEqual; return EqualMethodResult.ComparedEqual; } return EqualMethodResult.TypesNotSupported; } private static bool OverridesEqualsObject(Type type) { MethodInfo method = type.GetMethod("Equals", BindingFlags.Instance | BindingFlags.Public, null, EqualsObjectParameterTypes, null); if ((object)method != null) return method.DeclaringType != (type.IsValueType ? typeof(ValueType) : typeof(object)); return false; } } }