Refactor _get_existing_jira_issue() and add tests
#401
+298
−103
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The purpose of this PR is to provide proper unit test coverage for
_get_existing_jira_issue()(which would have been handy for #398...). However, that function contains flows which are too complex to test in a straightforward way, so this PR includes a refactorization of the function, splitting substantial sections into two other functions. The resulting functions are tested by exercising a series of scenarios for each one.While I am at it, I also add a unit test for the
UrlCacheclass.