public void FindNthRoot_ThrowArgumentException(double a, int n, double eps)
{
Assert.Throws <ArgumentException>(() => FindNthRoot.SqrtN(a, n, eps));
}
public void FindNthRootTestCase(double a, int n, double eps, double expected)
{
double actual = FindNthRoot.SqrtN(a, n, eps);
Assert.AreEqual(actual, expected, eps);
}