chore: Add getRandomChoice method for test compatibility

Author: ligiastalves

src/main/java/com/thealgorithms/puzzlesandgames/RockPaperScissors.java

@@ -55,12 +55,17 @@ public static void main(String[] args) {
         scanner.close();
     }
 
-    private static String getResult(String userChoice, String computerChoice) {
+    public static String getResult(String userChoice, String computerChoice) {
         if (userChoice.equals(computerChoice)) {
             return "It's a tie!";
         } else if ((userChoice.equals("rock") && computerChoice.equals("scissors")) || (userChoice.equals("scissors") && computerChoice.equals("paper")) || (userChoice.equals("paper") && computerChoice.equals("rock"))) {
             return "You win! :D ";
         } else
             return "You lose! :( ";
     }
+    public static String getRandomChoice() {
+        String[] options = {"rock", "paper", "scissors"};
+        Random random = new Random();
+        return options[random.nextInt(options.length)];
+    }
 }

src/test/java/com/thealgorithms/puzzlesandgames/RockPaperScissorsTest.java

@@ -0,0 +1,28 @@
+package com.thealgorithms.puzzlesandgames;
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class RockPaperScissorsTest {
+
+    @Test
+    void testGetResultTie() {
+        assertEquals("It's a tie!", RockPaperScissors.getResult("rock", "rock"));
+    }
+
+    @Test
+    void testGetResultWin() {
+        assertEquals("You win! :D ", RockPaperScissors.getResult("rock", "scissors"));
+    }
+
+    @Test
+    void testGetResultLose() {
+        assertEquals("You lose! :( ", RockPaperScissors.getResult("rock", "paper"));
+    }
+
+    @Test
+    void testGetRandomChoiceIsValid() {
+        String choice = RockPaperScissors.getRandomChoice();
+        assertTrue(choice.equals("rock") || choice.equals("paper") || choice.equals("scissors"));
+    }
+}