code: import numpy as np
  
  from pydemic.diseases import covid19
  from pydemic.models import eSIR
  
  
  class TestSIR:
      def test_basic_esir_api(self):
          m = eSIR(disease=covid19)
          m.run(30)
          res = m["I"]
          ok = m.data.loc[m.times[0], "infectious"] * np.exp(m.K * m.times)
  
          assert m.R0 == 2.74
          assert abs(m.K - m.gamma * 1.74) <= 1e-6
          assert m.iter == len(m.data) == len(m.times) == len(m.dates)
          assert np.abs(res / ok - 1).max() < 1e-4
  
apis: numpy.abs numpy.exp