def test_file_delete():
r = Renderer(bna_sample, output_dir)
bg_name = r.background_map_name
fg_format = r.foreground_filename_format
# dump some files into output dir:
open(os.path.join(output_dir, bg_name), 'w').write('some junk')
for i in range(5):
open(os.path.join(output_dir, fg_format % i), 'w'
).write('some junk')
r.prepare_for_model_run(model_start_time=datetime.now(),
num_time_steps=10)
# there should only be a background image now.
files = os.listdir(output_dir)
assert files == [r.background_map_name]
