code: def testTransform(self):
      def tr(coord, dx, dy):
          return coord[0] + dx, coord[1] + dy
  
      layout = Layout([(1, 2), (3, 4)])
      layout.transform(tr, 2, -1)
      self.assertEqual(layout.coords, [[3, 1], [5, 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 11 for calling the LayoutTests obj's underlying member method code with example usage: obj.testTransform() and returns: unknown,  unknown