feat: add testing for macos (#39)

[tkrop]

This pull request adds testing for MacOS to identify whether the library has some operating system dependency. While this uncovers a different behavior on how environment variables are expanded on MacOS, there is no clear indicator that the library is failing on MacOS.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ 100.00% (target: 80.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7d00e4f)	635	635	100.00%
Head commit (310ffaa)	635 (+0)	635 (+0)	100.00% (+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 (#39)	1	1	100.00%

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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[coveralls]

Pull Request Test Coverage Report for Build 19214478894

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file 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 19045178656:	0.0%
Covered Lines:	635
Relevant Lines:	635

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💛 - Coveralls

[tkrop]

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