def test_each_chapter_follows_the_last(chapter):
chapter_no = CHAPTERS.index(chapter)
if chapter_no == 0:
return
previous = CHAPTERS[chapter_no - 1]
if previous in BRANCHES:
previous = CHAPTERS[chapter_no - 2]
assert f'{previous})' in git_log(chapter), f'{chapter} did not follow {previous}'
def previous_chapter(chapter):
chapter_no = CHAPTERS.index(chapter)
if chapter_no == 0:
return None
previous = CHAPTERS[chapter_no - 1]
if previous in BRANCHES:
previous = CHAPTERS[chapter_no - 2]
return previous