test(plugins): add missing tests for plugin resolution logic

[devoto13]

Depends on and includes #3659 (just want to run CI, for now, will rebase before the merge).

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[karmarunnerbot]

✅ Build karma 545 completed (commit b3b8af351b by @devoto13)

[karmarunnerbot]

✅ Build karma 544 completed (commit b3b8af351b by @devoto13)

[hdmr14]

@googlebot I consent.

[johnjbarton]

Thanks!

[karmarunnerbot]

❌ Build karma 551 failed (commit b95360dd37 by @devoto13)

[karmarunnerbot]

❌ Build karma 550 failed (commit b95360dd37 by @devoto13)

[devoto13]

@johnjbarton Can you merge #3659 first?
Then I'll rebase this PR and we can merge it as well.

PS I've missed that #3659 was not merged and rebased anyways, that's why build is failing now.

[karmarunnerbot]

✅ Build karma 553 completed (commit 379bab16ee by @devoto13)

[devoto13]

@johnjbarton Rebased and should be ready to land now.

[karmarunnerbot]

✅ Build karma 552 completed (commit 379bab16ee by @devoto13)

[karmarunnerbot]

🎉 This PR is included in version 6.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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