Philip Withnall 19c7a7bb23 gsubprocess: Add a missing test for invalid UTF-8 output
There were tests for invalid UTF-8 output when asynchronously
communicating with a subprocess, but nothing for synchronous
communication. Add such a test, and refine the code as a result.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
2018-10-11 11:31:27 +13:00
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