* Subclass factory for JSON path services
* Common methods moved to JSON path class
* should throw error if _getData is not overridden
* Test JSON path factory using chai-as-promised
* Using chai-as-promised in more tests
* JSDoc for json-path
* Error message adopted to JSON and YAML
* Dynamic YAML badge handles YAML with a string
* 'fetch' naming covention
* Strict string validation in error message
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