import calc.Calculator; 
import org.junit.Before; 
import org.junit.Ignore; 
import org.junit.Test; 
import static org.junit.Assert.*;

public class CalculatorTest
{

    private static Calculator calculator = new Calculator();

   @Before
   public void clearCalculator()
   {
      calculator.clear();
   }

   @Test
   public void add()
   {
      calculator.add (1); 
      calculator.add (1); 
      assertEquals (calculator.getResult(), 2); 
   }

   @Test
   public void subtract()
   {
      calculator.add (10); 
      calculator.subtract (2); 
      assertEquals (calculator.getResult(), 8); 
   }

   @Test
   public void divide()
   {
      calculator.add (8); 
      calculator.divide (2); 
      assert calculator.getResult() == 5; 
   }

   @Test (expected = ArithmeticException.class)
   public void divideByZero()
   {
      calculator.divide (0); 
   }


   @Ignore ("not ready yet")
   @Test
   public void multiply()
   {
      calculator.add (10); 
      calculator.multiply (10); 
      assertEquals (calculator.getResult(), 100); 
   }
}