code: def test_center_parameter(self):
      G = nx.path_graph(1)
      nx.random_layout(G, center=(1, 1))
      vpos = nx.circular_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.planar_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.spring_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.fruchterman_reingold_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.spectral_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.shell_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
      vpos = nx.spiral_layout(G, center=(1, 1))
      assert tuple(vpos[0]) == (1, 1)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 19 for calling the TestLayout obj's underlying member method code with example usage: obj.test_center_parameter() without return types