old_contents: from unittest import TestCase
  
  from phi import struct, math
  from phi.geom import Sphere, Box
  from phi.math import batch, channel
  from phi.physics._boundaries import Domain, Obstacle
  
  
  class TestLegacyPhysics(TestCase):
  
      def test_domain(self):
          dom = Domain(x=16, y=16)
          dom.scalar_grid(0)
  
  
new_contents: from unittest import TestCase
  
  from phi import math
  from phi.geom import Sphere, Box
  from phi.math import batch, channel
  from phi.physics._boundaries import Domain, Obstacle
  
  
  class TestLegacyPhysics(TestCase):
  
      def test_domain(self):
          dom = Domain(x=16, y=16)
          dom.scalar_grid(0)
  
  
subject: Remove legacy struct dependency