text: import matplotlib
  matplotlib.use('Agg')
  
  import numpy as np
  from astropy.tests.helper import pytest
  
  from .. import FITSFigure
  
  
  def test_frame_linewidth():
      data = np.zeros((16, 16))
      f = FITSFigure(data)
      f.frame.set_linewidth(0)
      f.frame.set_linewidth(1)
      f.frame.set_linewidth(10)
      f.close()
  
  
  def test_frame_color():
      data = np.zeros((16, 16))
      f = FITSFigure(data)
      f.frame.set_color('black')
      f.frame.set_color('#003344')
      f.frame.set_color((1.0, 0.4, 0.3))
      f.close()
  