import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * The test class CoreFeaturesTest.
 *
 * @author  (your name)
 * @version (a version number or a date)
 */
public class CoreFeaturesTest
{
    private Console console = new Console();
    private CoreFeatures core = new CoreFeatures(console);
    
      @Test
    public void addTest()
    {
        console.changeCurrentValue(2);
        double testAdd = core.add(2);
        assertEquals(4, testAdd, 0);
    }
    
     @Test
    public void minusTest()
    {
        console.changeCurrentValue(2);
        double testMinus = core.subtract(2);
        assertEquals(0, testMinus, 0);
    }
    
      @Test
    public void timesTest()
    {
        console.changeCurrentValue(2);
        double testTimes = core.multiply(2);
        assertEquals(4, testTimes, 0);
    }
    
      @Test
    public void divideTest()
    {
        console.changeCurrentValue(2);
        double testDivide = core.divide(2);
        assertEquals(1, testDivide, 0);
    }
    
      @Test
    public void squareTest()
    {
        console.changeCurrentValue(2);
        double testSquare = core.square();
        assertEquals(4, testSquare, 0);
    }
    
      @Test
    public void sqrtTest()
    {
        console.changeCurrentValue(4);
        double testSqrt = core.squareRoot();
        assertEquals(2, testSqrt, 0);
    }
    
    @Test
    public void inverseTest()
    {
        console.changeCurrentValue(2);
        double testInverse = core.inverse();
        assertEquals(.5, testInverse, 0);
    }
    
    @Test
    public void changeSignTest()
    {
        console.changeCurrentValue(2);
        double testChangeSign = core.changeSign();
        assertEquals(-2, testChangeSign, 0);
    }
    
    @Test
    public void variableExponentiationTest()
    {
        console.changeCurrentValue(2);
        double testVariableExponentiation = core.variableExponentiation(2);
        assertEquals(4, testVariableExponentiation, 0);
    }
    
    @Test
    public void getValueTest()
    {
        console.changeCurrentValue(2);
        double testGetValue = console.getCurrentValue();
        assertEquals(2, testGetValue, 0);
    }
    
    @Test
    public void clearValueTest()
    {
        
        double testClearValue = console.clearCurrentValue();
        assertEquals(0, testClearValue, 0);
    }
    
    @Test
    public void changeValueTest()
    {
        
        double testChangeValue = console.changeCurrentValue(9);
        assertEquals(9, testChangeValue, 0);
    }
    
}