Junit_TestClass_Version_2

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

public class CalculatorTest {

	private static Calculator calculator;

	@BeforeClass
	public static void setUpClass() throws Exception {
		calculator = new Calculator();
	}

	@AfterClass
	public static void tearDownClass() throws Exception {
		calculator.switchOff();
	}

	@Before
	public void setUp() throws Exception {
		calculator.clear();
	}

	@After
	public void tearDown() throws Exception {
		calculator.clear();
	}

	/**
	 * Test of add method, of class Calculator.
	 */
	@Test
	public void testAdd() {
		System.out.println("add");
		int n = 0;
		calculator.set(0);
		calculator.add(5);
		assertEquals(5, calculator.getResult());

	}

	/**
	 * Test of substract method, of class Calculator.
	 */
	@Test
	public void testSubstract() {
		System.out.println("substract");
		int n = 3;
		calculator.set(5);
		calculator.substract(n);
		assertEquals(2, calculator.getResult());
	}

	/**
	 * Test of multiply method, of class Calculator.
	 */
	@Test
	public void testMultiply() {
		System.out.println("multiply");
		int n = 2;
		calculator.set(4);
		calculator.multiply(n);
		assertEquals(8, calculator.getResult());

	}

	/**
	 * Test of divide method, of class Calculator.
	 */
	@Test(/* expected= ArithmeticException.class */)
	public void testDivide() {
		System.out.println("divide");
		int n = 0;
		calculator.set(10);
		calculator.divide(n);

	}

	/**
	 * Test of square method, of class Calculator.
	 */
	@Test
	public void testSquare() {
		System.out.println("square");
		int n = 0;
		calculator.square(n);

	}

	/**
	 * Test of squareRoot method, of class Calculator.
	 */
	@Test
	public void testSquareRoot() {
		System.out.println("squareRoot");
		int n = 0;
		calculator.set(0);
		calculator.squareRoot(n);

	}

	/**
	 * Test of clear method, of class Calculator.
	 */
	@Test
//	@Ignore
	public void testClear() {
		System.out.println("clear");
		Calculator instance = new Calculator();
		instance.clear();
		// TODO review the generated test code and remove the default call to
		// fail.
		fail("The test case is a prototype.");
	}

	/**
	 * Test of switchOn method, of class Calculator.
	 */
	@Test
	public void testSwitchOn() {
		System.out.println("switchOn");
		calculator.switchOn();

	}

	/**
	 * Test of switchOff method, of class Calculator.
	 */
	@Test
	public void testSwitchOff() {
		System.out.println("switchOff");
		calculator.switchOff();

	}

	/**
	 * Test of getResult method, of class Calculator.
	 */
	@Test
	public void testGetResult() {
		System.out.println("getResult");
		int expResult = 0;
		int result = calculator.getResult();
		assertEquals(expResult, result);
	}

}