tests: fix specific only_reruns, improve typing and docstring

[everoddandeven]

No description provided.

[codacy-production]

Not up to standards ⛔

🔴 Issues 3 medium · 2 minor

Alerts:
⚠ 5 issues (≤ 3 issues of at least minor severity)

Results:
5 new issues

Category	Results
Security	1 medium
CodeStyle	2 minor
Complexity	2 medium

View in Codacy

🟢 Metrics 43 complexity · 10 duplication

Metric	Results
Complexity	43
Duplication	10

View in Codacy

🟢 Coverage 90.83% diff coverage · -0.30% coverage variation

Metric	Results
Coverage variation	✅ -0.30% coverage variation (-1.00%)
Diff coverage	✅ 90.83% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (fd72016)	12214	11536	94.45%
Head commit (c6f2969)	12339 (+125)	11617 (+81)	94.15% (-0.30%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#102)	774	703	90.83%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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TIP This summary will be updated as you push new changes.}