def test_invalid_index(mock_osp):
"""
Return None when an out-of-bounds offset is passed.
"""
path = mock_osp.add_file()
syllabus = Syllabus(path)
assert syllabus.metadata(10) is None
def test_valid_index(mock_osp):
"""
When an in-bounds offset is passed to Syllabus#metadata(), the value
should be returned.
"""
path = mock_osp.add_file()
syllabus = Syllabus(path)
assert syllabus.metadata(1) is not None
