Tache 4 (La methode nextColor de la classe RandomColorGenerator).

app/src/main/java/model/RandomColorGenerator.java

 package model;
 
 import javafx.scene.paint.Color;
+import util.RandomUtil;
 
 import java.util.List;
 import java.util.Random;
@@ -9,6 +10,8 @@ public class RandomColorGenerator implements ColorGenerator{
 
     List<Color> colorList;
     Random random;
+    private RandomUtil randomUtil;
+
 
     public RandomColorGenerator(List<Color> colors , Random randomGenerator) {
         colorList = colors;
@@ -16,6 +19,6 @@ public class RandomColorGenerator implements ColorGenerator{
     }
     @Override
     public Color nextColor(Cell cell) {
-        return null;
+        return randomUtil.randomElement(colorList,random);
     }
 }