public void Test4Method1()
{
string email = "test@test_ru";
Lab6num4 num4 = new Lab6num4();
Assert.ThrowsException <ArgumentException>(() => num4.Num4(email), "не обработан почтовый ящик.");
}
public void Test4Method2()
{
string email = "*****@*****.**";
bool expected = true;
Lab6num4 num4 = new Lab6num4();
bool resultRegex = num4.Num4(email);
Assert.AreEqual(expected, resultRegex);
}