diff --git a/src/main/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13.java b/src/main/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13.java
index 65edfe2..fe782c5 100644
--- a/src/main/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13.java
+++ b/src/main/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13.java
@@ -18,4 +18,8 @@ public class Building13 extends BuildingCard{
     public void applyEffect(Player player) {
         player.addPrestige(25);
     }
+    @Override
+    public String toString() {
+        return "Era:"+String.valueOf(getEra())+"\nPrice:"+String.valueOf(getPrice())+"\n";
+    }
 }
diff --git a/src/main/java/it/polimi/ingsw/gc14/Model/PlayableCard.java b/src/main/java/it/polimi/ingsw/gc14/Model/PlayableCard.java
index 13a1ea2..7d3b418 100644
--- a/src/main/java/it/polimi/ingsw/gc14/Model/PlayableCard.java
+++ b/src/main/java/it/polimi/ingsw/gc14/Model/PlayableCard.java
@@ -5,8 +5,12 @@ public abstract class PlayableCard {
     public int getEra(){
         return Era;
     }
-    public PlayableCard (int Era){
-        this.Era = Era;
+    public PlayableCard (int Era) throws IllegalArgumentException{
+        if (Era>0 && Era<4) {
+            this.Era = Era;
+        } else {
+            throw new IllegalArgumentException();
+        }
     }
 
     @Override
diff --git a/src/test/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13Test.java b/src/test/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13Test.java
new file mode 100644
index 0000000..8e2290d
--- /dev/null
+++ b/src/test/java/it/polimi/ingsw/gc14/Model/Cards/Building/Effects/Building13Test.java
@@ -0,0 +1,28 @@
+package it.polimi.ingsw.gc14.Model.Cards.Building.Effects;
+
+import it.polimi.ingsw.gc14.Model.Player;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class Building13Test {
+
+
+    @Test
+    void testClone() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            Building13 b2 = new Building13(0, 15);
+            Building13 b3 = new Building13(-1, 100);
+            Building13 b4 = new Building13(5, -10);
+            Building13 b5 = new Building13(-2, 0);
+        });
+
+        Building13 b1 = new Building13(1, 10);
+        assertEquals(1, b1.getEra());
+
+    }
+
+    @Test
+    void applyEffect() {
+    }
+}
\ No newline at end of file