using NUnit.Compatibility; using System; using System.Runtime.CompilerServices; namespace NUnit.Framework.Constraints { [NullableContext(1)] [Nullable(0)] public class AttributeExistsConstraint : Constraint { private readonly Type _expectedType; public override string Description => "type with attribute " + MsgUtils.FormatValue(_expectedType); public AttributeExistsConstraint(Type type) : base(type) { _expectedType = type; if (!typeof(Attribute).IsAssignableFrom(_expectedType)) { DefaultInterpolatedStringHandler defaultInterpolatedStringHandler = new DefaultInterpolatedStringHandler(25, 1); defaultInterpolatedStringHandler.AppendLiteral("Type "); defaultInterpolatedStringHandler.AppendFormatted(_expectedType); defaultInterpolatedStringHandler.AppendLiteral(" is not an attribute"); throw new ArgumentException(defaultInterpolatedStringHandler.ToStringAndClear(), "type"); } } public override ConstraintResult ApplyTo<[Nullable(2)] TActual>(TActual actual) { Guard.ArgumentNotNull(actual, "actual"); Attribute[] customAttributes = AttributeHelper.GetCustomAttributes(actual, _expectedType, true); ConstraintResult constraintResult = new ConstraintResult(this, actual); constraintResult.Status = ((customAttributes.Length != 0) ? ConstraintStatus.Success : ConstraintStatus.Failure); return constraintResult; } } }