fix building tests when char is unsigned #824
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when char is unsigned it's uint8_t which doesn't match the type declared for the key of the map, so it fails with error: non-constant-expression cannot be narrowed from type 'typename std::enable_if<std::is_integral<char>::value && sizeof(char) == sizeof(char), char>::type' (aka 'char') to 'const signed char' in initializer list etc
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when char is unsigned it's uint8_t which doesn't match the type declared for the key of the map, so it fails with
error: non-constant-expression cannot be narrowed from type 'typename std::enable_if<std::is_integral::value && sizeof(char) == sizeof(char), char>::type' (aka 'char') to 'const signed char' in initializer list
etc