ThrowsExceptionConstraint
ThrowsExceptionConstraint tests that an exception has
been thrown, without any further tests.
using NUnit.Framework.Internal;
using System;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
namespace NUnit.Framework.Constraints
{
[NullableContext(1)]
[Nullable(0)]
public class ThrowsExceptionConstraint : Constraint
{
[Nullable(0)]
private class ThrowsExceptionConstraintResult : ConstraintResult
{
public ThrowsExceptionConstraintResult(ThrowsExceptionConstraint constraint, [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<[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<[Nullable(2)] TActual>(ActualValueDelegate<TActual> del)
{
return ApplyTo((Delegate)del);
}
[AsyncStateMachine(typeof(<ApplyToAsync>d__4<>))]
public override Task<ConstraintResult> ApplyToAsync<[Nullable(2)] TActual>(Func<Task<TActual>> actual)
{
<ApplyToAsync>d__4<TActual> stateMachine = default(<ApplyToAsync>d__4<TActual>);
stateMachine.<>t__builder = AsyncTaskMethodBuilder<ConstraintResult>.Create();
stateMachine.<>4__this = this;
stateMachine.actual = actual;
stateMachine.<>1__state = -1;
stateMachine.<>t__builder.Start(ref stateMachine);
return stateMachine.<>t__builder.Task;
}
public ThrowsExceptionConstraint()
: base(Array.Empty<object>())
{
}
}
}