I came across the word \'The Turkey Test\' while learning about code testing. I don\'t know really what it means.
What is Turkey Test? Why is it called so?
The link provided by @Luixv gives a comprehensive description of the issue.
The summary is that if your going to test your code on only one non-English locale, test it on Turkish.
This is because the Turkish has instances of most edge cases you are likely to encounter with localization, including "unusual" format strings and non-standard characters (such as a different capitalization rules for i).