function test_computer_randomnum()
 {
     //Arrange
     $user_input = "Rock";
     $test_RockPaperScissors = new RockPaperScissors($user_input);
     //Array
     $result = $test_RockPaperScissors->getComputerInput();
     //Assert
     $this->assertTrue(is_string($result));
 }