[ADD] test building docs

.travis.yml

@@ -10,15 +10,22 @@ python:
   # - "pypy"  # Disable because travis changes are affecting us
   - "pypy3"
 
+addons:
+  apt:
+    packages:
+      - realpath
+
 # command to install dependencies, e.g. pip install -r requirements.txt --use-mirrors
 install:
     - pip install -r requirements.txt
     - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install -r https://raw.githubusercontent.com/OCA/OCB/8.0/requirements.txt; fi
     - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install -r https://raw.githubusercontent.com/OCA/OCB/9.0/requirements.txt; fi
+    - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then pip install sphinx; fi
 
 # command to run tests, e.g. python setup.py test
 script:
     - flake8 ~/OCA/openupgradelib
+    - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then git clone --single-branch --depth=1 https://github.com/OCA/openupgrade ~/OCA/openupgrade; pip install -r ~/OCA/openupgrade/requirements.txt; sh ~/OCA/openupgrade/scripts/build_openupgrade_docs; fi
     - if [ "$TRAVIS_PYTHON_VERSION" == "2.7" ]; then export PYTHONPATH=~/OCA/openupgradelib:$PYTHONPATH; fi
     - coverage run setup.py test
     - python setup.py install