def test_one_real_one_comment(self): assert({'a'} == bde_items(P('one')/'real'/'one'/'comment'))
def test_one_commented_item(self): assert(set() == bde_items(P('one')/'commented'/'item'))
def test_two_commented_items_same_line(self): assert(set() == bde_items(P('two')/'commented'/'same'/'line'))
def test_two_items_on_same_line(self): assert({'a', 'b'} == bde_items(P('two')/'same'/'line'))
def test_item_on_each_line(self): assert({'a', 'b'} == bde_items(P('two')/'diff'/'lines'))
def test_one_char_item(self): assert({'a'} == bde_items(P('one')/'char'))
def test_longer_char_item(self): assert({'ab'} == bde_items(P('longer')/'char'))