Fix test_html_doc in test_pydoc

[serhiy-storchaka]

BPO	47042
Nosy	@serhiy-storchaka
PRs	bpo-47042: Fix testing the HTML output in test_pydoc #31959

^{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 2022-03-18.12:15:42.105>
created_at = <Date 2022-03-17.10:57:10.093>
labels = ['type-bug', 'tests', '3.11']
title = 'Fix test_html_doc in test_pydoc'
updated_at = <Date 2022-03-18.12:15:42.103>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2022-03-18.12:15:42.103>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-18.12:15:42.105>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2022-03-17.10:57:10.093>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 47042
keywords = ['patch']
message_count = 3.0
messages = ['415396', '415426', '415488']
nosy_count = 1.0
nosy_names = ['serhiy.storchaka']
pr_nums = ['31959']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47042'
versions = ['Python 3.11']

[serhiy-storchaka]

Due to missed splitlines() in test_pydoc the HTML output was not tested correctly. Instead of testing that the actual output contains every *line* from the expected output it tested that the actual output contains every *character* from the expected output. The test would pass with any actual output which contains all Latin letters and some punctuation.

The following PR fixes this bug and makes the test even more strict. Now it tests that the actual output contains the same lines as the expected output, in the same order, ignoring indentation and empty lines.

[serhiy-storchaka]

New changeset a5d2460 by Serhiy Storchaka in branch 'main':
bpo-47042: Fix testing the HTML output in test_pydoc (GH-31959)
a5d2460

[serhiy-storchaka]

It is 3.11 only issue.