ThrowsExceptionConstraint
ThrowsExceptionConstraint tests that an exception has
been thrown, without any further tests.
using NUnit.Framework.Internal;
using System;
using System.Runtime.CompilerServices;
namespace NUnit.Framework.Constraints
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public class ThrowsExceptionConstraint : Constraint
{
[System.Runtime.CompilerServices.Nullable(0)]
private class ThrowsExceptionConstraintResult : ConstraintResult
{
public ThrowsExceptionConstraintResult(ThrowsExceptionConstraint constraint, [System.Runtime.CompilerServices.Nullable(2)] Exception caughtException)
: base(constraint, caughtException, caughtException != null)
{
}
public override void WriteActualValueTo(MessageWriter writer)
{
if (base.Status == ConstraintStatus.Failure)
writer.Write("no exception thrown");
else
base.WriteActualValueTo(writer);
}
}
public override string Description => "an exception to be thrown";
public override ConstraintResult ApplyTo<[System.Runtime.CompilerServices.Nullable(2)] TActual>(TActual actual)
{
Delegate parameterlessDelegate = ConstraintUtils.RequireActual<Delegate>(actual, "actual", false);
Exception caughtException = ExceptionHelper.RecordException(parameterlessDelegate, "actual");
return new ThrowsExceptionConstraintResult(this, caughtException);
}
public override ConstraintResult ApplyTo<[System.Runtime.CompilerServices.Nullable(2)] TActual>(ActualValueDelegate<TActual> del)
{
return ApplyTo((Delegate)del);
}
public ThrowsExceptionConstraint()
: base(Array.Empty<object>())
{
}
}
}