text: import unittest
  import numpy as np
  import flavio
  
  constraints = flavio.default_parameters
  wc_obj = flavio.WilsonCoefficients()
  par = constraints.get_central_all()
  
  class TestTauPnu(unittest.TestCase):
      def test_taupnu(self):
          # compare to the experimental values
          self.assertAlmostEqual(
              flavio.Observable.get_instance("BR(tau->pinu)").prediction_central(constraints, wc_obj),
              10.82e-2, delta=2*0.05e-2)
          self.assertAlmostEqual(
              flavio.Observable.get_instance("BR(tau->Knu)").prediction_central(constraints, wc_obj),
              6.96e-3, delta=2*0.1e-3)
  