The new oldtest directory is in test/old/testdir. The reason for this is
that many tests have hardcoded the parent directory name to be
'testdir'.

Problem:    Some code not covered by tests.
Solution:   Add a few more tests. (Dominique Pellé, closes vim/vim#8757)
https://github.com/vim/vim/commit/bfb2bb16bc69441fa3ec13caacb2c94637a8a0ec

Problem:    Various Normal mode commands not fully tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes vim/vim#7059)
https://github.com/vim/vim/commit/8a9bc95eaec53f4e0c951ff8f2686ae5113a5709

Cherry-pick Test_normal_gdollar_cmd() change from patch 8.2.0540.

Problem:    Spellfile functionality not fully tested.
Solution:   Add tests for SFX with removal of characters, spelling
            suggestions with NOBREAK and others. (Dominique Pellé,
            closes vim/vim#8293)
https://github.com/vim/vim/commit/bb162367ac77db877586086d7456685f2aeb8754

Problem:    Spellfile functionality not fully tested.
Solution:   Add tests for CIRCUMFIX, NOBREAK and others. (Dominique Pellé,
            closes vim/vim#8283)
https://github.com/vim/vim/commit/5a6cfb3ff2f2f422a3732f3855616c89dd19c19d

Reorder test_spellfile.vim to match upstream.

Problem:    Still not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes vim/vim#6790)
https://github.com/vim/vim/commit/b9fc192f928b484c8809fb985ef334d7a2bb5a09

Problem:    Not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes vim/vim#6763)
https://github.com/vim/vim/commit/c8ec5fe56fc30201c889ca577bf1e69823fadb2a

Add missing whitespace in message.

Problem:    Not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes vim/vim#6728)
https://github.com/vim/vim/commit/fc2a47ffc425777704b329c9edbe21163bedf63c

Problem:    Errors in spell file not tested.
Solution:   Add test for spell file errors. (Yegappan Lakshmanan,
            closes vim/vim#6721)
https://github.com/vim/vim/commit/c0f8823ee4ca629db5446ba0a935f68d4a4fb193

Problem:    NOCOMPOUNDSUGS entry in spell file not tested.
Solution:   Add a test. (Dominique Pellé, closes vim/vim#8624)
https://github.com/vim/vim/commit/9c9472ff49b09c3d8f747b330eeb1cdb92bab449