code: def test_simple(self):
      self.assert_bb([(3, 4), (4, 3)], {6, 4})
      self.assert_bb([(2, 2), (2, 4), (2, 2)], {4})
  
      # many squares
      self.assert_bb([(2, 2)] * 9, {2, 18})
  
      # One big square and many small ones.
      self.assert_bb([(3, 3)] + [(1, 1)] * 2, {3, 4})
      self.assert_bb([(3, 3)] + [(1, 1)] * 3, {3, 4})
      self.assert_bb([(3, 3)] + [(1, 1)] * 4, {3, 5})
      self.assert_bb([(3, 3)] + [(1, 1)] * 5, {3, 5})
      self.assert_bb([(1, 1)] * 6 + [(3, 3)], {3, 5})
      self.assert_bb([(3, 3)] + [(1, 1)] * 7, {3, 6})
  
      # many identical rectangles
      self.assert_bb([(7, 190)] * 4 + [(190, 7)] * 4, {190, 56})
  
      # require placing the flipped version of a rectangle
      self.assert_bb([(1, 100), (5, 96), (4, 5)], {100, 6})
  
imports: import unittest
  import torch
  import torch.nn.functional
  from pytorch3d.renderer.mesh.rasterizer import Fragments
  from pytorch3d.renderer.mesh.textures import _list_to_padded_wrapper, TexturesAtlas, TexturesUV, TexturesVertex
  from pytorch3d.renderer.mesh.utils import pack_rectangles, pack_unique_rectangles, Rectangle
  from pytorch3d.structures import list_to_packed, Meshes, packed_to_list
  from .common_testing import TestCaseMixin
  from .test_meshes import init_mesh
label_desc: Use image node_id 4 for calling the TestRectanglePacking obj's underlying member method code with example usage: obj.test_simple() without return types