There are a million threads spread out over many forums on this subject, most pointing out local courses, but a lot less mentioning top quality, internationally recognised certification.

Cambridge, the very posh, over 800 year old university in England, do courses that end in certificates valid in over 130 countries.
They aren't especially expensive, and you come out with a bit of paper worth having.
There are testing centres all over the world, so getting one is easy enough (If you're willing to put the effort into getting a real qualification).

http://www.cambridgeenglish.org/teachin … ons/delta/

http://www.cambridgeenglish.org/teachin … ons/celta/

Of course, you get get a cheap and nasty bit of paper from a million places, but they're for cheap and nasty jobs.
If you want to do it properly, get a quality qualification from somewhere such as Cambridge.

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