У меня работает с NUnit.Framework на NUnit 2.5 Beta 2. Из кода для 2.4.8, похоже, что он в том же классе.
namespace NUnit.Framework
{
// Summary:
// The Assert class contains a collection of static methods that implement the
// most common assertions used in NUnit.
public class Assert
{
public static void That(bool condition);
public static void That(ActualValueDelegate del, IResolveConstraint expr);
public static void That(bool condition, string message);
public static void That(object actual, IResolveConstraint expression);
public static void That<T>(ref T actual, IResolveConstraint constraint);
public static void That(TestDelegate code, IResolveConstraint constraint);
public static void That(ActualValueDelegate del, IResolveConstraint expr, string message);
public static void That(bool condition, string message, params object[] args);
public static void That(object actual, IResolveConstraint expression, string message);
public static void That<T>(ref T actual, IResolveConstraint constraint, string message);
public static void That(ActualValueDelegate del, IResolveConstraint expr, string message, params object[] args);
public static void That(object actual, IResolveConstraint expression, string message, params object[] args);
public static void That<T>(ref T actual, IResolveConstraint expression, string message, params object[] args);
}
}
AssertionHelper
также находится в том же пространстве имен.
Для Is
- попробуйте NUnit.Framework.SyntaxHelpers