tests: Restructure test files for documentation

[nam-hle]

Flow-up #170.

Also, re-structure README test files to align with the README files.

[coveralls]

Pull Request Test Coverage Report for Build 359

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 349:	0.0%
Covered Lines:	363
Relevant Lines:	363

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💛 - Coveralls

[gajus]

:tada: This PR is included in version 6.7.0 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: