@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 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);
}
@Test
public void testGetHistory() {
Calculator calc = new Calculator();
assertEquals(calc.getHistory(), "" + 0);
calc.add(14);
calc.divide(2);
calc.multiply(3);
calc.subtract(6);
// Testing the history method
assertEquals("0 + 14 / 2 * 3 - 6", calc.getHistory());
}
@Test
public void testSubtract() throws Exception {
assertEquals(1d, calculator.subtract(5d, 4d), 0);
}