Problem:    Not all options code is covered by tests.
Solution:   Add more tests for options. (Yegappan Lakshmanan, closes #8369)

Problem:    Various code not covered by tests.
Solution:   Add a few more test. (Yegappan Lakshmanan, closes #7995)

Problem:    Some tests fail when run as root.
Solution:   Use CheckNotRoot.

Problem:    Tests fail when run as root.
Solution:   Add a comment mentioning the expected failure. (issue #7919)

Problem:    Missing test coverage.
Solution:   Improve test coverage for completion with different encodings,
            mapset(), and term function failures. (Dominique Pellé,
            closes #7877)

Problem:    Reading past the end of the command line.
Solution:   Check for NUL. (closes #7204)

Problem:    Can't do something just before leaving Insert mode.
Solution:   Add the InsertLeavePre autocommand event. (closes #7177)

Problem:    Crash when USE_FNAME_CASE is defined and using :browse.
Solution:   Don't use read-only memory for ".". (Yegappan Lakshmanan,
            closes #7123)

Problem:    Not consistently giving the "is a directory" warning.
Solution:   Adjust check for illegal file name and directory. (Yasuhiro
            Matsumoto, closes #7067)

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)