@Test
public void testDivide() {
a = 8;
b = 2;
int result = calculator.divide(a, b);
Assert.assertEquals(a / b, result);
a = 8;
b = -2;
result = calculator.divide(a, b);
Assert.assertEquals(a / b, result);
}
@Test
public void testDivideByZero() {
a = 20;
b = 0;
Integer result = calculator.divide(a, b);
Assert.assertNull(result);
}
@Test(expected = Exception.class)
public void divisionWithException() {
// divide by zero
calculator.divide(42, 0);
}