public static void SlopePolar(double thetaRadians, double radius, double radiusPrime, double expected)
{
double result = GeometryLibrary.SlopePolar(thetaRadians, radius, radiusPrime);
Assert.AreEqual(expected, result, Tolerance);
}
public static void SlopePolar_Throws_DivideByZeroException(double thetaRadians, double radius, double radiusPrime)
{
Assert.Throws <DivideByZeroException>(() => GeometryLibrary.SlopePolar(thetaRadians, radius, radiusPrime));
}