public void RootTest()
{
//check Root()
Assert.AreEqual(2, OwnMath.root(8, 3));
Assert.AreEqual(0.5, OwnMath.root(8, -3));
Assert.AreEqual(0, OwnMath.root(0, 3));
Assert.ThrowsException <Exception>(() => (OwnMath.root(-8, 3)));
Assert.ThrowsException <Exception>(() => (OwnMath.root(8, 0)));
}
