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

Problem:    Character input not fully tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #7963)

Problem:    Undo file not found when using ":args" or ":next".
Solution:   Handle like editing another file. (closes #7072)

Problem:    Not all code for options is tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5913)

Problem:    Insufficient code coverage for ex_docmd.c functions.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5618)

Problem:    Some undo functionality is not tested.
Solution:   Add a few more test cases. (Dominique Pelle, closes #5364)

Problem:    Test72 is old style.
Solution:   Convert to new style test. (Yegappan Lakshmanan, closes #5362)

Problem:    MS-Windows: testing external commands can be improved.
Solution:   Adjust tests, remove duplicate test. (closes #4928)

Problem:    Delete call commented out for debugging.
Solution:   Restore the delete call. (Christian Brabandt)

Problem:    More functions can be used as methods.
Solution:   Make various functions usable as a method.