Added file updates and fixed a bug with truncated JSON files

There was a bug where `File::write()` would not write the entire
buffer, and this condition was left unchecked by the code. All
`File::write()` calls are now replaced with `File::write_all()` which
ensures the whole buffer is written to the backing file.

Additionally added a smoke check for the file updates. It is in no way
comprehensive nor it is able to catch all the possible failures but
it's a good way of testing the functionality without way too much hassle.

0 files changed, 0 insertions, 0 deletions