Fixes#2876 with @paulmelnikow's suggestion
Moved imports of `ServiceTester` and `createServiceTester` to a separate file so that dev dependencies are not imported by service classes.
Continue to implement #2698:
- Add `core/base-service/index.js` (but hold off on moving the things it imports)
- Add shortcuts in `services/index.js` for Base*Service, errors, and deprecatedService. This file will be streamlined later to avoid cluttering it with rarely used bits.
- Apply consistent ordering of imports and use of `module.exports` in testers.
- Remove some renaming of imports.
- Remove obsolete tests here and there.
* fix: updated Azure DevOps fetch function to reflect query param name change
* fix: fixed branch filter for azure devops to enable branch name usage
* fix: simplified branch pattern for azure devops badges
* Correct regex generation logic
* Refactor variable name
* Mock Azure DevOps test result summary API
* Add live tests
Updated mocked tests to use expected values for assertion. Added live
tests to test the API. Added `no tests` as an acceptable result for live
tests.
* Declare common nock setup functions to avoid repetition
Added a test results badge service for an Azure Pipelines build using the ResultSummaryByBuild endpoint. Added basic unit tests for the service.
Close#2411
