code: def test_dispersion_v_only(self):
      G = small_ego_G()
      disp_G_h = nx.dispersion(G, v="h", normalized=False)
      disp_G_h_normalized = nx.dispersion(G, v="h", normalized=True)
      assert disp_G_h == {"c": 0, "f": 0, "j": 0, "k": 0, "u": 4}
      assert disp_G_h_normalized == {
          "c": 0.0,
          "f": 0.0,
          "j": 0.0,
          "k": 0.0,
          "u": 1.0,
      }
  
imports: import networkx
label_desc: Use image node_id 3 for calling the TestDispersion obj's underlying member method code with example usage: obj.test_dispersion_v_only() without return types