test: improve test coverage for plugin-coverage #6287

Job	Run time
Format check	31s
Integration tests (ubuntu-latest)	47s
Build	1m 29s
Linter	1m 3s
Integration tests (windows-latest)	1m 47s
Integration tests (macos-latest)	57s
Unit tests (macos-latest)	1m 3s
Unit tests (windows-latest)	2m 21s
Unit tests (ubuntu-latest)	46s
E2E tests (windows-latest)	2m 45s
E2E tests (macos-latest)	1m 26s
E2E tests (ubuntu-latest)	1m 36s
Format check	46s
E2E tests (windows-latest)	2m 45s
Unit tests (ubuntu-latest)	46s
E2E tests (ubuntu-latest)	1m 36s
E2E tests (macos-latest)	1m 26s
Integration tests (ubuntu-latest)	47s
Unit tests (windows-latest)	2m 21s
Integration tests (windows-latest)	1m 47s
Linter	1m 3s
Build	1m 29s
Unit tests (macos-latest)	1m 3s
Integration tests (macos-latest)	57s
	33m 17s

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