pprint tests do not test pprint.pprint()

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-21.20:23:04.931>
labels = ['type-bug', 'library', '3.9', '3.10', '3.11']
title = 'pprint tests do not test pprint.pprint()'
updated_at = <Date 2022-02-18.15:18:17.383>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2022-02-18.15:18:17.383>
actor = 'eric.smith'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-10-21.20:23:04.931>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 45559
keywords = []
message_count = 3.0
messages = ['404647', '413484', '413486']
nosy_count = 2.0
nosy_names = ['eric.smith', 'hp310780']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45559'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']