public class NumberCalcTest {

	@Test
	public void addNumber_thenReturnAdditionResult(){
	NumberCalc numberCalc = new NumberCalc();
	int result = numberCalc.addNumber(1,2);
	Assert.assertEquals(3, result);
	}

	@Test
	public void multiply_thenReturnMultiplicationResult(){
	NumberCalc numberCalc = new NumberCalc();
	double result = numberCalc.multiplyNumber(2.1,3.1);
	Assert.assertEquals(6.51, result, 1e-2); // 0.01
	}

}