diff --git a/pyscroll/group.py b/pyscroll/group.py
index c04a88d..d930569 100644
--- a/pyscroll/group.py
+++ b/pyscroll/group.py
@@ -1,27 +1,39 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from dataclasses import dataclass
+from typing import TYPE_CHECKING, Any
 
-import pygame
+from pygame.rect import Rect
+from pygame.sprite import LayeredUpdates
+from pygame.surface import Surface
+
+from pyscroll.common import Vector2D
 
 if TYPE_CHECKING:
-    from .orthographic import BufferedRenderer
+    from pyscroll.orthographic import BufferedRenderer
+
 
+@dataclass
+class SpriteMeta:
+    surface: Surface
+    rect: Rect
+    layer: int
+    blendmode: Any = None
 
-class PyscrollGroup(pygame.sprite.LayeredUpdates):
+
+class PyscrollGroup(LayeredUpdates):
     """
     Layered Group with ability to center sprites and scrolling map.
 
     Args:
         map_layer: Pyscroll Renderer
-
     """
 
-    def __init__(self, map_layer: BufferedRenderer, *args, **kwargs) -> None:
-        pygame.sprite.LayeredUpdates.__init__(self, *args, **kwargs)
+    def __init__(self, map_layer: BufferedRenderer, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
         self._map_layer = map_layer
 
-    def center(self, value) -> None:
+    def center(self, value: Vector2D) -> None:
         """
         Center the group/map on a pixel.
 
@@ -30,44 +42,43 @@ def center(self, value) -> None:
 
         Args:
             value: x, y coordinates to center the camera on
-
         """
         self._map_layer.center(value)
 
     @property
-    def view(self) -> pygame.Rect:
+    def view(self) -> Rect:
         """
         Return a Rect representing visible portion of map.
-
         """
         return self._map_layer.view_rect.copy()
 
-    def draw(self, surface: pygame.surface.Surface) -> list[pygame.rect.Rect]:
+    def draw(self, surface: Surface) -> list[Rect]:
         """
         Draw map and all sprites onto the surface.
 
         Args:
             surface: Surface to draw to
-
         """
         ox, oy = self._map_layer.get_center_offset()
         draw_area = surface.get_rect()
         view_rect = self.view
 
-        new_surfaces = list()
+        new_surfaces: list[SpriteMeta] = []
         spritedict = self.spritedict
         gl = self.get_layer_of_sprite
-        new_surfaces_append = new_surfaces.append
 
         for spr in self.sprites():
             new_rect = spr.rect.move(ox, oy)
             if spr.rect.colliderect(view_rect):
-                try:
-                    new_surfaces_append((spr.image, new_rect, gl(spr), spr.blendmode))
-                except AttributeError:
-                    # should only fail when no blendmode available
-                    new_surfaces_append((spr.image, new_rect, gl(spr)))
+                blendmode = getattr(spr, "blendmode", None)
+                new_surfaces.append(SpriteMeta(spr.image, new_rect, gl(spr), blendmode))
                 spritedict[spr] = new_rect
 
         self.lostsprites = []
-        return self._map_layer.draw(surface, draw_area, new_surfaces)
+
+        # Convert dataclass back to tuple before drawing
+        renderables: list[tuple[Surface, Rect, int, Any]] = [
+            (meta.surface, meta.rect, meta.layer, meta.blendmode)
+            for meta in new_surfaces
+        ]
+        return self._map_layer.draw(surface, draw_area, renderables)
diff --git a/tests/pyscroll/test_pyscroll_group.py b/tests/pyscroll/test_pyscroll_group.py
new file mode 100644
index 0000000..d6d6cc6
--- /dev/null
+++ b/tests/pyscroll/test_pyscroll_group.py
@@ -0,0 +1,215 @@
+import unittest
+from unittest.mock import MagicMock
+
+import pygame
+from pygame.rect import Rect
+from pygame.sprite import Sprite
+from pygame.surface import Surface
+
+from pyscroll.group import PyscrollGroup, SpriteMeta
+from pyscroll.orthographic import BufferedRenderer
+
+
+class TestSpriteMeta(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        pygame.init()
+
+    @classmethod
+    def tearDownClass(cls):
+        pygame.quit()
+
+    def test_initialization_with_blendmode(self):
+        surface = Surface((32, 32))
+        rect = Rect(10, 10, 32, 32)
+        meta = SpriteMeta(
+            surface=surface, rect=rect, layer=1, blendmode=pygame.BLEND_ADD
+        )
+
+        self.assertEqual(meta.surface.get_size(), (32, 32))
+        self.assertEqual(meta.rect, rect)
+        self.assertEqual(meta.layer, 1)
+        self.assertEqual(meta.blendmode, pygame.BLEND_ADD)
+
+    def test_default_blendmode_is_none(self):
+        surface = Surface((32, 32))
+        rect = Rect(0, 0, 32, 32)
+        meta = SpriteMeta(surface=surface, rect=rect, layer=0)
+
+        self.assertIsNone(meta.blendmode)
+
+
+class TestPyscrollGroup(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        pygame.init()
+
+    @classmethod
+    def tearDownClass(cls):
+        pygame.quit()
+
+    def setUp(self):
+        self.surface = Surface((640, 480))
+        self.map_layer = MagicMock(spec=BufferedRenderer)
+        self.group = PyscrollGroup(self.map_layer)
+
+    def test_init(self):
+        self.assertIsInstance(self.group, PyscrollGroup)
+        self.assertEqual(self.group._map_layer, self.map_layer)
+
+    def test_center(self):
+        self.group.center((100, 100))
+        self.map_layer.center.assert_called_once_with((100, 100))
+
+    def test_view(self):
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        view = self.group.view
+        self.assertEqual(view, Rect(0, 0, 640, 480))
+        self.assertIsNot(view, self.map_layer.view_rect)
+
+    def test_draw(self):
+        sprite1 = MagicMock(spec=Sprite)
+        sprite1.image = Surface((32, 32))
+        sprite1.rect = Rect(10, 10, 32, 32)
+        sprite1.layer = 0
+
+        sprite2 = MagicMock(spec=Sprite)
+        sprite2.image = Surface((32, 32))
+        sprite2.rect = Rect(600, 400, 32, 32)
+        sprite2.layer = 0
+
+        self.group.add(sprite1, sprite2)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite1.rect, sprite2.rect]
+
+        drawn_rects = self.group.draw(self.surface)
+
+        self.map_layer.draw.assert_called_once()
+        self.assertEqual(drawn_rects, [sprite1.rect, sprite2.rect])
+
+    def test_draw_with_offset(self):
+        sprite1 = MagicMock(spec=Sprite)
+        sprite1.image = Surface((32, 32))
+        sprite1.rect = Rect(10, 10, 32, 32)
+        self.group.add(sprite1)
+
+        self.map_layer.get_center_offset.return_value = (50, 50)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite1.rect.move(50, 50)]
+
+        drawn_rects = self.group.draw(self.surface)
+
+        self.map_layer.draw.assert_called_once()
+        self.assertEqual(drawn_rects, [sprite1.rect.move(50, 50)])
+
+    def test_draw_with_blendmode(self):
+        sprite1 = MagicMock(spec=Sprite)
+        sprite1.image = Surface((32, 32))
+        sprite1.rect = Rect(10, 10, 32, 32)
+        sprite1.blendmode = pygame.BLEND_ADD
+        self.group.add(sprite1)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite1.rect]
+
+        drawn_rects = self.group.draw(self.surface)
+
+        self.map_layer.draw.assert_called_once()
+        self.assertEqual(drawn_rects, [sprite1.rect])
+
+    def test_draw_without_blendmode(self):
+        sprite1 = MagicMock(spec=Sprite)
+        sprite1.image = Surface((32, 32))
+        sprite1.rect = Rect(10, 10, 32, 32)
+        self.group.add(sprite1)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite1.rect]
+
+        drawn_rects = self.group.draw(self.surface)
+
+        self.map_layer.draw.assert_called_once()
+        self.assertEqual(drawn_rects, [sprite1.rect])
+
+    def test_lostsprites_reset(self):
+        sprite = MagicMock(spec=Sprite)
+        sprite.image = Surface((32, 32))
+        sprite.rect = Rect(10, 10, 32, 32)
+        self.group.add(sprite)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite.rect]
+
+        self.group.lostsprites = [sprite]  # manually set
+        self.group.draw(self.surface)
+        self.assertEqual(self.group.lostsprites, [])
+
+    def test_sprite_layer_in_draw(self):
+        sprite = MagicMock(spec=Sprite)
+        sprite.image = Surface((32, 32))
+        sprite.rect = Rect(10, 10, 32, 32)
+        self.group.add(sprite, layer=2)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite.rect]
+
+        self.group.draw(self.surface)
+        layer = self.group.get_layer_of_sprite(sprite)
+        self.assertEqual(layer, 2)
+
+    def test_sprite_outside_view_is_skipped(self):
+        sprite = MagicMock(spec=Sprite)
+        sprite.image = Surface((32, 32))
+        sprite.rect = Rect(1000, 1000, 32, 32)  # way outside
+        self.group.add(sprite)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = []
+
+        drawn = self.group.draw(self.surface)
+        self.assertEqual(drawn, [])
+
+    def test_sprite_partially_visible(self):
+        sprite = MagicMock(spec=Sprite)
+        sprite.image = Surface((32, 32))
+        sprite.rect = Rect(630, 470, 32, 32)  # just inside bottom-right
+        self.group.add(sprite)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite.rect]
+
+        drawn = self.group.draw(self.surface)
+        self.assertEqual(drawn, [sprite.rect])
+
+    def test_draw_no_sprites(self):
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = []
+
+        drawn = self.group.draw(self.surface)
+        self.map_layer.draw.assert_called_once()
+        self.assertEqual(drawn, [])
+
+    def test_draw_sprite_without_blendmode_attribute(self):
+        sprite = MagicMock(spec=Sprite)
+        sprite.image = Surface((32, 32))
+        sprite.rect = Rect(10, 10, 32, 32)
+        del sprite.blendmode  # simulate absence
+        self.group.add(sprite)
+
+        self.map_layer.get_center_offset.return_value = (0, 0)
+        self.map_layer.view_rect = Rect(0, 0, 640, 480)
+        self.map_layer.draw.return_value = [sprite.rect]
+
+        drawn = self.group.draw(self.surface)
+        self.assertEqual(drawn, [sprite.rect])