std.testing: Added newline to the error messages

Added newline to every `std.debug.print` message.
Closes https://github.com/ziglang/zig/issues/8777
e94bbc2237ZapAnton committed on 5/15/2021, 5:27:39 AM· committed by Andrew Kelleyparent1e5e664
1 file changedLine totals unavailable