code: def test_fit(self):
      UniformSampler().fit(None)
  
imports: import itertools
  import pytest
  from pyrdf2vec.graphs import KG, Vertex
  from pyrdf2vec.samplers import UniformSampler
label_desc: Use image node_id 2 for calling the TestUniformSampler obj's underlying member method code with example usage: obj.test_fit() without return types