Problem:
Since 96128a5076 the test logs have noise from tests that *expect*
failures:
$NVIM_LOG_FILE: /tmp/cirrus-ci-build/build/.nvimlog
(last 100 lines)
ERR 2024-09-04T13:38:45.181 T949.28335.0/c terminfo_start:486: uv_pipe_open failed: no such device or address
ERR 2024-09-04T13:38:45.181 T949.28335.0/c flush_buf:2527: uv_write failed: bad file descriptor
ERR 2024-09-04T13:38:45.181 T949.28335.0/c flush_buf:2527: uv_write failed: bad file descriptor
WRN 2024-09-04T13:43:43.294 ?.35904 server_start:173: Failed to start server: address already in use: /…/Xtest_tmpdir/…/T7159.35895.0
WRN 2024-09-04T13:43:43.314 ?.35907 server_start:173: Failed to start server: illegal operation on a directory: /
ERR 2024-09-04T13:43:43.332 ?.35909 socket_watcher_init:60: Host lookup failed: https://example.com
Solution:
Rewrite the test to use `vim.system()`. Set NVIM_LOG_FILE in the child
process to a "throwaway" logfile.
Problem:
137f98cf64 added the `create` parameter to `tmpname()` but didn't
fully implement it.
Solution:
- Update impl for the `os.tmpname()` codepath.
- Inspect all usages of `tmpname()`, update various tests.
Specifically, functions that are run in the context of the test runner
are put in module `test/testutil.lua` while the functions that are run
in the context of the test session are put in
`test/functional/testnvim.lua`.
Closes https://github.com/neovim/neovim/issues/27004.
