code: def testRK4Solution(self):
      # Check for convergence when solution using RK4 function of calculation of derivative
      SyncTestTemplates.templateSimulateTest(
          10, 1, solve_type.RK4, False
      )
  
imports: import unittest
  import matplotlib
  from pyclustering.nnet.tests.sync_templates import SyncTestTemplates
  from pyclustering.nnet import solve_type, conn_type
  from pyclustering.nnet.sync import sync_network, sync_dynamic, sync_visualizer
  from pyclustering.utils import pi
label_desc: Use image node_id 8 for calling the SyncUnitTest obj's underlying member method code with example usage: obj.testRK4Solution() without return types