unit testing - How to JUnit test for any output in Java -


i'd test 2 methods below, because based on random output go-to assertequals() won't work.

i want test ensure methods producing kind of output. ideas?

novice programmer, appreciate help. 

    public void comprandomchoice() {     double choice = (math.random() * 100 / 100);      if (choice > 0 && choice <= 0.34) {         computer.setchoice(handthrow.rock);     } else if (choice > 0.34 && choice <= 0.67) {         computer.setchoice(handthrow.paper);     } else {         computer.setchoice(handthrow.scissors);     } }       public string gamewinner() {     string gameresult;      if (human.getchoice() == computer.getchoice()) {         gameresult = "its tie!";     } else if (human.getchoice() == handthrow.rock             && computer.getchoice() == handthrow.scissors             || human.getchoice() == handthrow.paper             && computer.getchoice() == handthrow.rock             || human.getchoice() == handthrow.scissors             && computer.getchoice() == handthrow.paper) {         gameresult = "congrats, win!";     } else {         gameresult = "computer wins!";     }     return gameresult;  }

i suggest changing comprandomchoice() function follows

public void comprandomchoice(double rand_no) {     double choice = (rand_no * 100 / 100);      if (choice > 0 && choice <= 0.34) {         computer.setchoice(handthrow.rock);     } else if (choice > 0.34 && choice <= 0.67) {         computer.setchoice(handthrow.paper);     } else {         computer.setchoice(handthrow.scissors);     } }

then in program, can call comprandomchoice(math.random()) in unit tests, can hard-code input, e.g. comprandomchoice(0.5) , assert result expected.

similarly, change public string gamewinner() public string gamewinner(string human_choice, string computer_choice)

 public string gamewinner(string human_choice, string computer_choice) {     string gameresult;      if (human_choice == computer_choice) {         gameresult = "its tie!";     .......

in code, can call function gamewinner(human.getchoice(), computer.getchoice()). in unit tests, can hard code input (using approach similar used previous function) , assert expected result based on parameter passing.


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