unit-testsuites.cpp: fix hangup if file not found #1262
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Cosmetic fix for test-testsuites:
If the test binary is run from the wrong directory, std::ifstream f("test/data/big-list-of-naughty-strings/blns.json"); will not find the input file and thus f.eof() will never return true.
Use canonical C++ file reading loop from https://gehrcke.de/2011/06/reading-files-in-c-using-ifstream-dealing-correctly-with-badbit-failbit-eofbit-and-perror/ instead of checking for f.eof().
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include/nlohmann
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