At #26110 we noticed that the --optional option for doctests is really
strange when you don't specify "sage" as one of the optional packages.
Here is how things currently work: any doctest line which doesn't
contain any other tag (like "# optional - mypkg" or even "# long time")
is treated as if it had "# optional - sage". In other words: if you run
doctests with --optional=mypkg (without "sage"), then you are running
only tests containing "# optional - mypkg". If you use "--long
--optional=mypkg", then you run all "# long time" tests and all "#
optional - mypkg" tests.
Needless to say, this is useless: tests almost never pass when run this
way. The implementation looks deliberately designed, so strictly
speaking it's not a bug. Still, I think that it's something that we
should change.
I can see two solutions:
1. Get rid of "--optional=sage" completely. An added bonus is that this
would slightly simplify the doctest framework.
2. Interpret all "sage:" prompts (as opposed to ">>>" prompts) as
implying "# optional - sage". This means that a line like
sage: do_something() # optional - mypkg
would only be run under --optional=sage,mypkg but a line like
>>> do_something() # optional - mypkg
would be run with --optional=mypkg
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