content: from __future__ import annotations
  from datashader.colors import rgb, hex_to_rgb
  
  import pytest
  
  
  def test_hex_to_rgb():
      assert hex_to_rgb('#FAFBFC') == (250, 251, 252)
      with pytest.raises(ValueError):
          hex_to_rgb('#FFF')
      with pytest.raises(ValueError):
          hex_to_rgb('FFFFFF')
      with pytest.raises(ValueError):
          hex_to_rgb('#FFFFFG')
  
  
  def test_rgb():
      assert rgb('#FAFBFC') == (250, 251, 252)
      assert rgb('blue') == (0, 0, 255)
      assert rgb((255, 255, 255)) == (255, 255, 255)
      with pytest.raises(ValueError):
          rgb((255, 256, 255))
      with pytest.raises(ValueError):
          rgb((-1, 255, 255))
      with pytest.raises(ValueError):
          rgb('foobar')
  