Skip locale-dependent tests if the required locale is not installed

[Gallaecio]

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[codecov]

Codecov Report

Merging #605 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #605   +/-   ##
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  Coverage   95.12%   95.12%           
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  Files         302      302           
  Lines        2503     2503           
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  Hits         2381     2381           
  Misses        122      122

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[noviluni]

That's really cool!

However, I'm not sure if we can merge it as is, because if for some reason (by error) we skip some locales in the pipeline, we would skip them without knowing it.

What do you think @Gallaecio ? Do you know if is there any way to detect that the tests are running within a pipeline and raise an error in that case if a locale is missing?

[Gallaecio]

I see your point, but to skip the required French locale in Travis CI we would have to remove line https://github.com/scrapinghub/dateparser/blob/master/.travis.yml#L30 so I’m not really concerned about such an scenario.

[noviluni]

Ok, I see it clearer now :)

[asadurski]

Good one!
We should probably add similar test for locale that's further away from English (not as part of this PR though).