Added getSize() method to MenuManager with test

src/main/java/Application/MenuManager.java

@@ -16,6 +16,12 @@ public class MenuManager {
         menuList.add(menu);
     }
 
+    public int getSize() {
+        if(inRootMenu())
+            return menuList.size();
+        return currentMenu.getSubMenuList().size();
+    }
+
     public void select(int i) {
         if (currentMenu == null)
             this.currentMenu = menuList.get(i);

src/test/java/Application/MenuManagerTest.java

@@ -73,4 +73,13 @@ class MenuManagerTest {
         mm.select(0);
         assertEquals(mm.getFormattedMenuList(), "1: Menu1.1\n");
     }
+
+    @Test
+    void getSize() {
+        assertEquals(mm.getSize(), 2);
+        mm.select(0);
+        assertEquals(mm.getSize(), 1);
+        mm.select(0);
+        assertEquals(mm.getSize(), 0);
+    }
 }