public void VerifyIsNegative()
{
//Arrange
double negativeNumber = -10;
//Assert
Assert.IsTrue(_calculator.isNegative(negativeNumber));
}
public void CheckIsNegativeWithDouble()
{
Thread.Sleep(10000);
Calculator calculator = new Calculator();
double a = -18655559;
//Act
var actualResult = calculator.isNegative(a);
//Assert
Assert.AreEqual(true, actualResult);
}