Test the unmap function (it doesn't work correctly)

src/memory/area_frame_allocator.rs

@@ -50,7 +50,7 @@ impl FrameAllocator for AreaFrameAllocator {
     }
 
     fn deallocate_frame(&mut self, _frame: Frame) {
-        unimplemented!()
+        //unimplemented!()
     }
 }
 

src/memory/paging/mod.rs

@@ -167,4 +167,15 @@ pub fn test_paging<A>(allocator: &mut A)
     page_table.map_to(page, frame, EntryFlags::empty(), allocator);
     println!("Some = {:?}", page_table.translate(addr));
     println!("next free frame: {:?}", allocator.allocate_frame());
+
+    println!("{:#x}", unsafe {
+        *(Page::containing_address(addr).start_address() as *const u64)
+    });
+
+    page_table.unmap(Page::containing_address(addr), allocator);
+    println!("None = {:?}", page_table.translate(addr));
+
+    println!("{:#x}", unsafe {
+        *(Page::containing_address(addr).start_address() as *const u64)
+    });
 }