[sqlite3] Improve test coverage

[erlend-aasland]

BPO	43553
Nosy	@berkerpeksag, @serhiy-storchaka, @pablogsal, @erlend-aasland
PRs	bpo-43553: Improve sqlite3 test coverage #26886
Files	improve-sqlite3-coverage.diff

^{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 2021-06-24.12:43:14.315>
created_at = <Date 2021-03-19.09:40:27.268>
labels = ['type-feature', 'library', '3.10']
title = '[sqlite3] Improve test coverage'
updated_at = <Date 2021-06-24.12:43:14.314>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2021-06-24.12:43:14.314>
actor = 'erlendaasland'
assignee = 'none'
closed = True
closed_date = <Date 2021-06-24.12:43:14.315>
closer = 'erlendaasland'
components = ['Library (Lib)']
creation = <Date 2021-03-19.09:40:27.268>
creator = 'erlendaasland'
dependencies = []
files = ['49892']
hgrepos = []
issue_num = 43553
keywords = ['patch']
message_count = 2.0
messages = ['389060', '396473']
nosy_count = 4.0
nosy_names = ['berker.peksag', 'serhiy.storchaka', 'pablogsal', 'erlendaasland']
pr_nums = ['26886']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue43553'
versions = ['Python 3.10']

[erlend-aasland]

Attached patch improves the code coverage of the sqlite3 module. I've used llvm-cov for coverage measurement.

I'll create a PR for this, if you're fine with this, Berker/Serhiy.

Filename Regions Missed Regions Cover Functions Missed Functions Executed Lines Missed Lines Cover
-------------------------------------------------------------------------------------------------------------------------------------------------
prepare_protocol.c 10 7 30.00% 3 2 33.33% 16 11 31.25%
util.c 65 21 67.69% 3 0 100.00% 78 26 66.67%
module.c 306 59 80.72% 10 1 90.00% 236 45 80.93%
row.c 173 16 90.75% 11 0 100.00% 146 13 91.10%
microprotocols.c 81 9 88.89% 3 0 100.00% 98 15 84.69%
connection.c 1113 155 86.07% 43 0 100.00% 1366 179 86.90%
cache.c 136 38 72.06% 7 1 85.71% 227 59 74.01%
cursor.c 758 116 84.70% 19 0 100.00% 794 122 84.63%
statement.c 340 22 93.53% 10 0 100.00% 392 29 92.60%
-------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL 2982 443 85.14% 109 4 96.33% 3353 499 85.12%

[pablogsal]

New changeset 2c1ae09 by Erlend Egeberg Aasland in branch 'main':
bpo-43553: Improve sqlite3 test coverage (GH-26886)
2c1ae09