public void ShouldReturnExpectedVal()
{
Assert.AreEqual(1, CenteredPentagonalNumber.Pentagonal(1));
Assert.AreEqual(6, CenteredPentagonalNumber.Pentagonal(2));
Assert.AreEqual(141, CenteredPentagonalNumber.Pentagonal(8));
Assert.AreEqual(226, CenteredPentagonalNumber.Pentagonal(10));
Assert.AreEqual(24751, CenteredPentagonalNumber.Pentagonal(100));
Assert.AreEqual(15087592276, CenteredPentagonalNumber.Pentagonal(77686));
}
public void ShouldReturnMinusOne()
{
Assert.AreEqual(-1, CenteredPentagonalNumber.Pentagonal(0));
Assert.AreEqual(-1, CenteredPentagonalNumber.Pentagonal(-1));
Assert.AreEqual(-1, CenteredPentagonalNumber.Pentagonal(-21));
}