public static void That(object expression, IConstraint constraint, object message, params object[] args)
{
var msg = (message != null)
? string.Format(message.ToString(), args)
: string.Empty;
if (!constraint.Match(expression))
{
IMessageWriter writer = new TextMessageWriter(msg ?? "");
writer.BuildMessage(constraint);
throw new AssertionException(writer.ToString());
}
}
