code: def testToPolar(self):
      layout = Layout([(0, 0), (-1, 1), (0, 1), (1, 1)])
      layout.to_radial(min_angle=180, max_angle=0, max_radius=2)
      exp = [[0.0, 0.0], [-2.0, 0.0], [0.0, 2.0], [2, 0.0]]
      for idx in range(4):
          self.assertAlmostEqual(
              layout.coords[idx][0], exp[idx][0], places=3
          )
          self.assertAlmostEqual(
              layout.coords[idx][1], exp[idx][1], places=3
          )
  
imports: import unittest
  from math import hypot
  from igraph import Graph, Layout, BoundingBox, InternalError
  from igraph import umap_compute_weights
label_desc: Use image node_id 10 for calling the LayoutTests obj's underlying member method code with example usage: obj.testToPolar() without return types