code: def test_is_regular1(self):
      g = gen.cycle_graph(4)
      assert reg.is_regular(g)
  
imports: import pytest
  import networkx
  import networkx
  import networkx.algorithms.regular
  import networkx.generators
label_desc: Use image node_id 1 for calling the TestIsRegular obj's underlying member method code with example usage: obj.test_is_regular1() without return types