public void CorenExceptionTest()
{
ISingle corenCalculator = new Coren();
Assert.Throws<ArgumentException>(() => corenCalculator.CreateCalculate(-1));
}
public void CorenTest(double first, double expected)
{
ISingle corenCalculator = new Coren();
double result = corenCalculator.CreateCalculate(first);
Assert.AreEqual(expected, result);
}