Add test for channel map set parsing

[gauthierm]

Adds an integration tests for parsing channel map set information in the get zone group state function.

A future update that would be nice is to split the parsing functions into separate files or classes so they can be tested independently rather than as an integration test.

[coveralls]

Pull Request Test Coverage Report for Build 458723305

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 76.599%

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Totals
Change from base Build 452489776:	0.3%
Covered Lines:	1150
Relevant Lines:	1520

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💛 - Coveralls

[svrooij]

Because I changed the branch where the PR should merge into it failed to send to code to coveralls. (need a solution for that, but the actual tests succeed!!).

So thank you @gauthierm for your first contribution! It will be included in the next beta, and that gets merged into latest soon! 🎉

[github-actions[bot]]

:tada: This PR is included in version 2.3.0-beta.4 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version 2.3.0 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket: