new_contents: import matplotlib.pyplot as plt
  import numpy as np
  
  t = np.arange(0.0, 2.0, 0.01)
  s = np.sin(2*np.pi*t)
  plt.plot(t, s)
  
  plt.xlabel('time (s)')
  plt.ylabel('voltage (mV)')
  plt.title('About as simple as it gets, folks')
  plt.grid(True)
  plt.savefig("test.png")
  plt.show()
subject: Add test script