CollectionConstraint
CollectionConstraint is the abstract base class for
constraints that operate on collections.
using NUnit.Framework.Internal;
using System;
using System.Collections;
using System.Linq;
using System.Runtime.CompilerServices;
namespace NUnit.Framework.Constraints
{
[System.Runtime.CompilerServices.NullableContext(1)]
[System.Runtime.CompilerServices.Nullable(0)]
public abstract class CollectionConstraint : Constraint
{
protected CollectionConstraint()
: base(Array.Empty<object>())
{
}
[System.Runtime.CompilerServices.NullableContext(2)]
protected CollectionConstraint(object arg)
: base(arg)
{
}
protected static bool IsEmpty(IEnumerable enumerable)
{
ICollection collection = enumerable as ICollection;
if (collection != null)
return collection.Count == 0;
return !enumerable.Cast<object>().Any();
}
public override ConstraintResult ApplyTo<[System.Runtime.CompilerServices.Nullable(2)] TActual>(TActual actual)
{
IEnumerable collection = ConstraintUtils.RequireActual<IEnumerable>(actual, "actual", false);
return new ConstraintResult(this, actual, Matches(collection));
}
protected abstract bool Matches(IEnumerable collection);
}
}