add another value to PSBTRole enum class in src/psbt.h without changing the
definition of std::string PSBTRoleName(PSBTRole role);
cmake .. -GNinja -WENABLE_WERROR:BOOL=True
ninja
notice that this raises an error:
../src/psbt.cpp:282:13: error: enumeration value 'TESTER' not handled in switch [-Werror,-Wswitch]
switch (role) {
without the WENABLE_WERROR flag set, it'll only emit a warning.