public void LnZeroTest()
{
LnCalculator calculator = new LnCalculator();
Assert.Throws<Exception>(() => calculator.Calculator(0));
}
public void LnTest(double first, double expected)
{
IOneArgumentsCalculator calculator = new LnCalculator();
double result = calculator.Calculator(first);
Assert.AreEqual(expected, result, 0.0001);
}