actually adds parameterized test

tests/test_pdf_generation.py

@@ -105,14 +105,15 @@ def test_generate_pdfs_num_files(datadir, tmpdir):
 
     assert len(tmpdir.listdir()) == num_copies
 
-
-def test_generate_checkboxes(datadir, tmpdir):
+@pytest.mark.parametrize('checkboxes', [[(300, 100, 1, 'c'), (500, 50, 0, 'd'), (500, 500, 0, 'a'), (250, 200, 1, 'b')],
+                         [], [(250, 100, 0, None)]])
+def test_generate_checkboxes(datadir, tmpdir, checkboxes):
     blank_pdf = os.path.join(datadir, 'blank-a4-2pages.pdf')
 
     num_copies = 1
     copy_nums = range(num_copies)
     paths = map(lambda copy_num: os.path.join(tmpdir, f'{copy_num}.pdf'), copy_nums)
-    checkboxes = [(300, 100, 1, 'c'), (500, 50, 0, 'd'), (500, 500, 0, 'a'), (250, 200, 1, 'b')]
+    # checkboxes = [(300, 100, 1, 'c'), (500, 50, 0, 'd'), (500, 500, 0, 'a'), (250, 200, 1, 'b')]
     pdf_generation.generate_pdfs(blank_pdf, 'ABCDEFGHIJKL', copy_nums, paths, 25, 270, 150, 270, checkboxes)
 
     assert len(tmpdir.listdir()) == num_copies