tests: refactor functional tests for OptPlug implementatios

[jkowalleck]

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[codacy-production]

Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅ (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (0a89152)	23301	22906	98.30%
Head commit (0aeb922)	23301 (+0)	22906 (+0)	98.30% (+0.00%)

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 (#1088)	0	0	∅ (not applicable)

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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