SeriesInfoExtractorServiceImpl.extractCountry(): add unit tests for filtering invalid names

[0pdd]

The puzzle 821-af9174a6 from #821 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/service/SeriesInfoExtractorServiceImpl.java

Line 148 in f8eee29

// @todo #821 SeriesInfoExtractorServiceImpl.extractCountry(): add unit tests for filtering invalid names

The puzzle was created by Slava Semushin on 19-Jan-18.

Estimate: 0 minutes, role: IMP.

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