Fix test_modulefinder

[serhiy-storchaka]

BPO	41040
Nosy	@serhiy-storchaka, @miss-islington
PRs	bpo-41040: Fix test_modulefinder. #20991 [3.9] bpo-41040: Fix test_modulefinder. (GH-20991) #20992 [3.8] bpo-41040: Fix test_modulefinder. (GH-20991) #20993

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-06-22.07:42:11.920>
created_at = <Date 2020-06-19.20:06:42.839>
labels = ['type-bug', '3.8', '3.9', '3.10', '3.7', 'tests']
title = 'Fix test_modulefinder'
updated_at = <Date 2020-06-22.07:42:11.919>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2020-06-22.07:42:11.919>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-22.07:42:11.920>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2020-06-19.20:06:42.839>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 41040
keywords = ['patch']
message_count = 4.0
messages = ['371897', '371901', '371904', '371905']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'miss-islington']
pr_nums = ['20991', '20992', '20993']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue41040'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[serhiy-storchaka]

There is a bug in test_modulefinder. The bytes string literal contains \u2090.

1. Since \u is not recognized escape sequence in bytes literals, compiling the file emits a deprecation warning:

/home/serhiy/py/cpython/Lib/test/test_modulefinder.py:281: DeprecationWarning: invalid escape sequence \u
b"""\

2. b"\u2090" is interpreted as b"\\u2090", but actually the test implies that it should be a bytes sequence b'\xe2\x82\x90' which is valid in UTF-8 but is not a valid in CP1252.

[serhiy-storchaka]

New changeset a041e11 by Serhiy Storchaka in branch 'master':
bpo-41040: Fix test_modulefinder. (GH-20991)
a041e11

[miss-islington]

New changeset 80651ab by Miss Islington (bot) in branch '3.8':
bpo-41040: Fix test_modulefinder. (GH-20991)
80651ab

[miss-islington]

New changeset 7523886 by Miss Islington (bot) in branch '3.9':
bpo-41040: Fix test_modulefinder. (GH-20991)
7523886