public void TestForNullException()
{
Assert.Throws<ArgumentNullException>(() => new MailMessage("[email protected]", null));
Assert.Throws<ArgumentNullException>(() => new MailMessage(null, new MailAddress("[email protected]")));
Assert.Throws<ArgumentNullException>(() => new MailMessage(new MailAddress("[email protected]"), null));
Assert.Throws<ArgumentNullException>(() => new MailMessage(null, "[email protected]"));
}