Problem: Various inconsistencies in test files.
Solution: Add modelines where they were missing. Use Check commands instead
of silently skipping over tests. Adjust indents and comments.
(Ken Takata, closes#6695)
Problem: Some tests fail on Cirrus CI and/or with FreeBSD.
Solution: Make 'backupskip' empty. Do not run tests as root. Check for
directory when using viminfo. (Ozaki Kiichi, closes#6596)
Problem: Some tests are still old style.
Solution: Convert tests 52 and 70 to new style. (Yegappan Lakshmanan,
closes#6544) Fix error in FinishTesting().
Problem: assert_fails() checks the last error message.
Solution: Check the first error, it is more relevant. Fix all the tests
that rely on the old behavior.
Problem: Insufficient testing for reading/writing files.
Solution: Add more tests. (Yegappan Lakshmanan, closes#6257)
Add "ui_delay" to test_override() and use it for the CTRL-O test.
Problem: If writing runs into a conversion error the backup file is
deleted. (Arseny Nasokin)
Solution: Don't delete the backup file is the file was overwritten and a
conversion error occurred. (Christian Brabandt, closes#4387)
Problem: Some tests fail on Solaris.
Solution: Skip writefile test. Fix path to libc.so. Improve test for Turkish
case change. (Libor Bukata, Bjorn Linse, closes#3403)
Problem: 'autowrite' takes effect when buffer is not to be written.
Solution: Don't write buffers that are not supposed to be written. (Even Q
Jones, closes#3391) Add tests for 'autowrite'.
Problem: Vim becomes unusable after opening new window in BufWritePre
event.
Solution: Call not_exiting(). (Martin Tournoij, closes#2205)
Also for "2q" when a help window is open. Add a test.
Problem: When making backups is disabled and conversion with iconv fails
the written file is truncated. (Luo Chen)
Solution: First try converting the file and write the file only when it did
not fail. (partly by Christian Brabandt)
Problem: writefile() continues after detecting an error.
Solution: Bail out as soon as an error is detected. (suggestions by Nikolai
Pavlov, closes#1476)
