@Test
public void testSubtract() {
Calculator calc = new Calculator();
assertEquals(calc.getTotal(), 0);
calc.subtract(-6);
calc.subtract(4);
// The total value should be 2 after subtracting -6 and 4 from 0
assertEquals(calc.getTotal(), 2);
}
@Test
public void testAdd() {
Calculator calc = new Calculator();
// Make sure the total value is 0
assertEquals(calc.getTotal(), 0);
calc.add(6);
calc.add(1);
// The total value should be 7 after adding 6 and 1 to 0
assertEquals(calc.getTotal(), 7);
}
@Test
public void testMultiply() {
Calculator calc = new Calculator();
calc.multiply(10);
assertEquals(calc.getTotal(), 0);
calc.add(2);
calc.multiply(7);
// The total value should be 14 after adding 2 to 0 then multiplying by 7
assertEquals(calc.getTotal(), 14);
}
@Test
public void testDivide() {
Calculator calc = new Calculator();
calc.divide(0);
// Testing dividing by 0
assertEquals(calc.getTotal(), 0);
calc.add(12);
calc.divide(6);
// The total value should be 2 after adding 12 then dividing by 6
assertEquals(calc.getTotal(), 2);
}
@Test
public void testGetTotal() {
Calculator calc = new Calculator();
calc.add(4);
calc.subtract(1);
calc.multiply(6);
calc.divide(3);
// The total value should be 6
assertEquals(calc.getTotal(), 6);
}
