Doctesting: don't test SageNB files unless SageNB has been installed

[jhpalmieri]

Since SageNB is now an optional package, we should detect whether it's present before doctesting its files via make ptestlong and similar commands.

Component: doctest framework

Author: John Palmieri

Branch/Commit: a579a9a

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/28834

[jhpalmieri]

Branch: u/jhpalmieri/dont_doctest_sagenb

[jhpalmieri]

Commit: a579a9a

[jhpalmieri]

comment:2

Without these changes, a Python 2 build of Sage fails to run doctests. With these changes, tests pass for me with a plain Python 2 build and also after running ./sage -i sagenb. Before running ./sage -i sagenb, make ptestlong says

Doctesting 3796 files using 12 threads...

(Same with Python 2 or Python 3)

After running ./sage -i sagenb, with Python 2:

Doctesting 3849 files using 12 threads...

So it appears that the extra files are being correctly detected and doctested.

---

New commits:

a579a9a

trac 28834: doctesting: detect whether sagenb is installed

[fchapoton]

Reviewer: Frédéric Chapoton

[fchapoton]

comment:3

ok, seems a reasonable thing to do

[dimpase]

comment:4

appears to work in Python2 with and without sagenb installed.

[vbraun]

Changed branch from u/jhpalmieri/dont_doctest_sagenb to a579a9a