results. Furthermore, without MacsBug, I run the test suite repeatedly, for a total of twentyΓÇôfour hours or more of execution time
on each variant of the program, and verify that
Pixie Scheme does not crash and continues to produce correct results.
Not all of the features of Pixie Scheme can be exercised by evaluating expressions: I use a list of manual operations to test menu commands, resizing and moving windows, opening and using dialog boxes, and so on.
Although I believe the tests I run on my own Macintosh are fairly comprehensive, I have