public void ShouldPrintFirstNumber()
 {
     NaturalNumbers nats = new NaturalNumbers(); //This is an instance
     int expected = 1;
     int actual = nats.GetFirst();
     Assert.AreEqual(expected, actual);
 }
 public void ShouldPrintFirstNumber()
 {
     NaturalNumbers nats = new NaturalNumbers();
     BigInteger expected = 1;
     BigInteger actual = nats.GetFirst();
     Assert.AreEqual(expected, actual);
 }
 public void ShouldPrintFirstNumber()
 {
     NaturalNumbers nats = new NaturalNumbers();
     int expected = 1;
     int actual = nats.GetFirst();
     //asserts can compare expected outputs vs actual outputs
     Assert.AreEqual(expected, actual);
 }