[Tests] Fix Xvfb for GTKUI tests running on TravisCI

.travis.yml

@@ -3,11 +3,6 @@ language: python
 python:
     - "2.7"
 
-# Cache packages download with apt
-cache:
-  directories:
-    - $HOME/.pip-cache/
-
 before_install:
   - lsb_release -a
   - sudo add-apt-repository ppa:deluge-team/ppa -y
@@ -17,13 +12,14 @@ before_install:
 install:
   - bash -c "echo $APTPACKAGES"
   - sudo apt-get install $APTPACKAGES
-  - pip install "tox>=1.8" --download-cache $HOME/.pip-cache
+  - pip install "tox>=1.8"
 
 env:
   global:
     - PIP_DOWNLOAD_CACHE=$HOME/.pip-cache/
     - APTPACKAGES="python-libtorrent"
     - APTPACKAGES_GTKUI="python-gobject python-glade2"
+    - DISPLAY=:99.0
   matrix:
     - TOX_ENV=pydef
     - TOX_ENV=flake8
@@ -43,8 +39,8 @@ virtualenv:
 before_script:
   - export PYTHONPATH=$PYTHONPATH:$PWD
   - python -c "import libtorrent as lt; print lt.version"
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
+  - "/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1280x1024x16"
 
 script:
+  - bash -c "echo $DISPLAY"
   - tox -e $TOX_ENV

tox.ini

@@ -14,6 +14,7 @@ envlist = py27, flake8, isort, docs
 minversion=1.8
 
 [testenv]
+passenv = DISPLAY
 setenv = PYTHONPATH = {env:PWD}:
 sitepackages = True
 deps =
@@ -81,7 +82,9 @@ deps =
 whitelist_externals =
     {[testenv]whitelist_externals}
     isort
-commands = python -c "import subprocess, sys; output = subprocess.check_output('isort --stdout --diff --recursive deluge docs win32 *.py', shell=True); print output; sys.exit(len(output) != 0)"
+commands =
+    isort --version
+    python -c "import subprocess, sys; output = subprocess.check_output('isort --diff --recursive deluge docs win32 *.py', shell=True); print output; sys.exit(len(output) != 0)"
 
 [testenv:flake8]
 setenv = {[testenv]setenv}