Mandate

gistfile1.txt

public static class Mandate
{
    public static void That<TException>(bool condition, string message) where TException : Exception
    {
        if (!condition)
        {
            var exceptionInstance = (TException)Activator.CreateInstance(typeof(TException), message);

            throw exceptionInstance;
        }
    }
}

Most useful for business rule enforcement and validation.

For example, we can't send an invoice if the invoice is null, therefore Mandate that it is not null before sending out.

Cons: it will build and allocate the exception message string on each test, even when not throwing.