Added test case to test verify mailto:// parsing

[caronc]

Description:

Related issue (if applicable): #990

A simple test case to verify that the configuration is actually set as expected based on ticket information.

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] 100% test coverage

Testing

not required; no code added outside of an additional unit test

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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