def test_create_PlotBlock_with_bbox_inches_none():
f = plt.figure()
b = i.PlotBlock(f, bbox_inches=None)
assert len(b._img_data) > 0
assert b._mime_type == 'png'
def test_create_PlotBlock():
f = plt.figure()
b = i.PlotBlock(f)
assert len(b._img_data) > 0
assert b._mime_type == 'png'