### Question:
Calculator { public double multiplication(double firstOperand, double secondOperand) { return firstOperand * secondOperand; }  double addition(double firstOperand, double secondOperand); double subtraction(double firstOperand, double secondOperand); double division(double firstOperand, double secondOperand); double multiplication(double firstOperand, double secondOperand);  }### Answer:
@Test public void mulTwoNumbers(){ double resultMul = mCalculator.multiplication(16d, 2d); assertThat(resultMul, is(equalTo(32d))); }
@Test public void mulTwoNumbersZero(){ double resultMul = mCalculator.multiplication(16d, 0d); assertThat(resultMul, is(equalTo(0d))); }