IdnaTestV2.txt should test for valid input with upper case in the ASCII part of Punycode

[hsivonen]

IdnaTestV2.txt missed a bug in the UTS 46 implementation that I'm writing due to not testing an upper-case letter in the ASCII part of Punycode when there are no errors.

I suggest adding this test case:

Input: xn--A-1ga
Expected ToASCII: xn--a-1ga
Expected ToUnicode: aö

[markusicu]

@macchiati FYI

[macchiati]

I agree; good idea. I recall that it is pretty easy to add special cases to the test data. Markus, I can take this one if you like.

[markusicu]

Feel free to take this -- and remember your action item to review other bugs in the test data :-) --> https://github.com/unicode-org/properties/issues/162