public void CheckInput_ValidInput()
{
var prime = new PrimeNumberCheck();
Assert.AreEqual(11, prime.CheckInput("11"));
Assert.AreEqual(2, prime.CheckInput("2"));
Assert.AreEqual(3, prime.CheckInput("3"));
}
public void CheckInput_InvalidInput()
{
var prime = new PrimeNumberCheck();
Assert.Throws <ArgumentException>(() => prime.CheckInput("hej"));
}