[tests] add py3-from-forge and add it to gitlab-ci

.gitlab-ci.yml

@@ -6,5 +6,8 @@ before_script:
 py3:
   script: tox -e py3
 
+py3-from-forge:
+  script: tox -e py3-from-forge
+
 check-manifest:
   script: tox -e check-manifest

tox.ini

@@ -9,6 +9,16 @@ deps =
 commands =
   logilab-pytest -t test {posargs}
 
+[testenv:py3-from-forge]
+deps =
+  pygments
+  pdflatex
+  pillow
+  hg-evolve  # to hide some warnings
+commands =
+  pip install hg+https://forge.extranet.logilab.fr/open-source/logilab-common
+  logilab-pytest -t test {posargs}
+
 [testenv:check-manifest]
 skip_install = true
 skipsdist = true