Problem:    Spellfile code not completely tested.
Solution:   Add a few more test cases. (Yegappan Lakshmanan, closes #6929)

Problem:    Spellfile code not completely tested.
Solution:   Add a few more test cases. (Yegappan Lakshmanan, closes #6918)

Problem:    Still not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes #6790)

Problem:    Not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes #6763)

Problem:    Not enough test coverage for the spell file handling.
Solution:   Add spell file tests. (Yegappan Lakshmanan, closes #6728)

Problem:    Errors in spell file not tested.
Solution:   Add test for spell file errors. (Yegappan Lakshmanan,
            closes #6721)

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:    There is :spellwrong and :spellgood but not :spellrare.
Solution:   Add :spellrare. (Martin Tournoij, closes #4291)