fix test of unicode support on Windows

[vh-d]

This should make the test of unicode support pass even on systems without UTF-8. Passes all tests on my Windows 7 system (set to Czech locale).

[vh-d]

There is another solution to this problem: adding an option to pass encoding= argument to parse() function in tinytest::test_package().

I find my solution with explicit hex representation more elegant but that feature for tinytest might be needed in the future anyway.

[codecov]

Codecov Report

Merging #39 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   59.71%   59.71%           
=======================================
  Files           3        3           
  Lines        1343     1343           
=======================================
  Hits          802      802           
  Misses        541      541

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[eddelbuettel]

Nice one -- thanks.