TST: add testing against pre-release numpy/scipy

Add travis test run using per-commit numpy development wheel, to make
sure numpy master isn't breaking anything for us.

Author: matthew-brett

.travis.yml

@@ -12,12 +12,12 @@ sudo: false
 cache:
   directories:
     - $HOME/.cache/pip
-
 addons:
   apt:
     packages:
       - libhdf5-serial-dev
-
+      # For numpy --pre wheels
+      - libatlas-base-dev
 env:
     global:
         - DEPENDS="numpy scipy matplotlib h5py"
@@ -45,6 +45,10 @@ matrix:
     - python: 2.7
       env:
         - PYDICOM="v1.0"
+    # test against pre-release builds
+    - python: 2.7
+      env:
+        - EXTRA_PIP_FLAGS="--pre"
     # Documentation doctests
     - python: 2.7
       env:
@@ -71,7 +75,7 @@ before_install:
     - python --version # just to check
     - pip install -U pip wheel  # upgrade to latest pip find 3.5 wheels; wheel to avoid errors
     - retry pip install nose flake8  # always
-    - wheelhouse_pip_install $DEPENDS
+    - wheelhouse_pip_install $EXTRA_PIP_FLAGS $DEPENDS
     # pydicom <= 0.9.8 doesn't install on python 3
     - if [ "${TRAVIS_PYTHON_VERSION:0:1}" == "2" ]; then
         if [ "$PYDICOM" == "1" ]; then
@@ -92,13 +96,13 @@ install:
       elif [ "$INSTALL_TYPE" == "sdist" ]; then
           python setup_egg.py egg_info  # check egg_info while we're here
           python setup_egg.py sdist
-          wheelhouse_pip_install dist/*.tar.gz
+          wheelhouse_pip_install $EXTRA_PIP_FLAGS dist/*.tar.gz
       elif [ "$INSTALL_TYPE" == "wheel" ]; then
           pip install wheel
           python setup_egg.py bdist_wheel
-          wheelhouse_pip_install dist/*.whl
+          wheelhouse_pip_install $EXTRA_PIP_FLAGS dist/*.whl
       elif [ "$INSTALL_TYPE" == "requirements" ]; then
-          wheelhouse_pip_install -r requirements.txt
+          wheelhouse_pip_install $EXTRA_PIP_FLAGS -r requirements.txt
           python setup.py install
       fi
     # Point to nibabel data directory

tools/travis_tools.sh

@@ -1,6 +1,12 @@
 # Tools for working with travis-ci
-export WHEELHOST="travis-wheels.scikit-image.org"
-export WHEELHOUSE="http://${WHEELHOST}/"
+WHEELHOSTS="travis-wheels.scikit-image.org travis-dev-wheels.scipy.org"
+
+PIP_FLAGS="--timeout=60 --no-index"
+
+for host in $WHEELHOSTS; do
+   PIP_FLAGS="${PIP_FLAGS} --trusted-host ${host} --find-links=http://${host}"
+done
+
 
 retry () {
     # https://gist.github.com/fungusakafungus/1026804
@@ -22,5 +28,5 @@ retry () {
 
 wheelhouse_pip_install() {
     # Install pip requirements via travis wheelhouse
-    retry pip install --timeout=60 --no-index --trusted-host $WHEELHOST --find-links $WHEELHOUSE $@
+    retry pip install $PIP_FLAGS $@
 }