old_contents: # coding: utf-8
  from mousestyles.distribution import (powerlaw_pdf, exp_pdf)
  
  
  def test_powerlaw_pdf():
      assert (powerlaw_pdf(2, 2) == 0.25)
  
  
  def test_exp_pdf():
      assert (abs(exp_pdf(2, 1) - 0.367879 <= 1e-7))
  
new_contents: # coding: utf-8
  from mousestyles.distribution import (powerlaw_pdf, exp_pdf)
  
  
  def test_powerlaw_pdf():
      assert (powerlaw_pdf(2, 2) == 0.25)
  
  
  def test_exp_pdf():
      assert (exp_pdf(2, 1) == 0.36787944117144233)
  
subject: revise test back