@Test public void shouldReturnZeroIfOperationsAreCancelled() { Calculator calculator = new Calculator(); calculator.cancel(); assertEquals(0.0, calculator.cancel(), 0.0001); }
@Test public void shouldReturnTheNumberIfTheNumberIsAddedAfterOperationsAreCancelled() { Calculator calculator = new Calculator(); calculator.add(5.0); calculator.cancel(); assertEquals(5.0, calculator.add(5.0), 0.0001); }