src/main/java/Action/Action.java

@@ -0,0 +1,5 @@
+package Action;
+
+public abstract class Action {
+    public static Dig Dig = new Dig();
+}

src/main/java/Action/Dig.java

@@ -0,0 +1,5 @@
+package Action;
+
+public class Dig extends Action {
+    
+}

src/main/java/Job/Job.java

@@ -1,5 +1,21 @@
 package Job;
 
-public interface Job {
-    void performJobAction();
+public abstract class Job {
+    private int level;
+    abstract void performJobAction();
+
+    Job() {
+        this.level = 1;
+    }
+    Job(int level) {
+        this.level = level;
+    }
+
+    public double getLevel() {
+        return level;
+    };
+
+    public void levelUp() {
+        level++;
+    }
 }

src/main/java/Job/Miner.java

@@ -2,7 +2,7 @@ package Job;
 
 import java.util.Objects;
 
-public class Miner implements Job {
+public class Miner extends Job {
     private final String jobName = "Miner";
 
     public Miner() {}

src/main/java/Player.java

@@ -1,7 +1,13 @@
+import Action.Dig;
 import Job.Job;
 
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+
 public class Player extends Character implements Movable {
     protected Job job;
+    protected List<String> items = new LinkedList<>();
     public Player(String name, Job job) {
         super(name);
         this.job = job;
@@ -23,4 +29,12 @@ public class Player extends Character implements Movable {
     public Job getJob() {
         return job;
     }
+
+    public void performAction(Dig dig) {
+        items.add("Stone");
+    }
+
+    public List<String> getInventory() {
+        return items;
+    }
 }

src/test/java/MinerTest.java

@@ -0,0 +1,29 @@
+import Action.Action;
+import Job.Miner;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class MinerTest {
+    @Test
+    void miner_can_dig() {
+        var p = new Player("Steve");
+        var job = new Miner();
+        p.learnJob(job);
+        p.performAction(Action.Dig);
+        assertTrue(p.getInventory().contains("Stone"));
+    }
+
+    @Test
+    void miner_can_level_up() {
+        var p = new Player("Steve");
+        var job = new Miner();
+        assertEquals(1, job.getLevel());
+        job.levelUp();
+        assertEquals(2, job.getLevel());
+    }
+
+}
+
+