Add script-type _spkg_check package that installs tox, mock, pytest etc.

[mkoeppe]

Following a suggestion by vbraun in #19680, this ticket adds a
_spkg_check package (type=script) that

• installs the Python packagestox, mock, pytest via pip if SAGE_CHECK=true
• does nothing otherwise.

The package _spkg_check can be added as a dependency of Python packages that use this standard testing infrastructure, for testing them if SAGE_CHECK=true.

The branch demonstrates this on the package pygments by adding an spkg-check.

If this approach is favored, probably the spkg nose, currently a dependency of cvxopt and networkx, could be removed.

CC: @vbraun @jdemeyer @kiwifb

Component: build

Branch/Commit: public/28998-check_dependencies_package @ 623cb21

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/28998

[mkoeppe]

Branch: public/28998-check_dependencies_package

[mkoeppe]

comment:2

On this branch, handling of sage -c does not work yet.
Contributions welcome.

---

New commits:

623cb21

Use script package 'check_dependencies' to install tox, pytest, etc.

[mkoeppe]

Commit: 623cb21

[mkoeppe]

comment:5

pushing these forward to 9.2

[mkoeppe]

comment:6

A simpler version, just for pytest, is in #29813, used in #29766 for networkx

[mkoeppe]

comment:7

tox in #29909

[mkoeppe]

comment:8

#30066: build/pkgs/mock: Downgrade from source=normal to pip, conditionalize dependencies

[mkoeppe]

comment:10

Setting new milestone based on a cursory review of ticket status, priority, and last modification date.

[mkoeppe]

comment:12

Outdated, can close

[mkoeppe]

Changed author from Matthias Koeppe to none

[slel]

Reviewer: Matthias Koeppe