TST: Run style tests separately

Author: effigies

.travis.yml

@@ -57,6 +57,12 @@ matrix:
     - python: 2.7
       env:
         - INSTALL_TYPE=requirements
+    - python: 2.7
+      env:
+        - STYLE=1
+    - python: 3.5
+      env:
+        - STYLE=1
 before_install:
     - source tools/travis_tools.sh
     - virtualenv --python=python venv
@@ -98,22 +104,26 @@ install:
     - export NIBABEL_DATA_DIR="$PWD/nibabel-data"
 # command to run tests, e.g. python setup.py test
 script:
-    # Run styles first, only on core nibabel code.
-    - flake8 nibabel
-    # Change into an innocuous directory and find tests from installation
-    - mkdir for_testing
-    - cd for_testing
-    - if [ "${COVERAGE}" == "1" ]; then
-      cp ../.coveragerc .;
-      COVER_ARGS="--with-coverage --cover-package nibabel";
-      fi
-    - if [ "$DOC_DOC_TEST" == "1" ]; then
-      pip install sphinx numpydoc texext;
-      cd ../doc;
-      make html;
-      make doctest;
+    - |
+      if [ "${STYLE}" == "1" ]; then
+          # Run styles only on core nibabel code.
+          flake8 nibabel
       else
-      nosetests --with-doctest $COVER_ARGS nibabel;
+          # Change into an innocuous directory and find tests from installation
+          mkdir for_testing
+          cd for_testing
+          if [ "${COVERAGE}" == "1" ]; then
+              cp ../.coveragerc .;
+              COVER_ARGS="--with-coverage --cover-package nibabel";
+          fi
+          if [ "$DOC_DOC_TEST" == "1" ]; then
+              pip install sphinx numpydoc texext;
+              cd ../doc;
+              make html;
+              make doctest;
+          else
+              nosetests --with-doctest $COVER_ARGS nibabel;
+          fi
       fi
 after_success:
     - if [ "${COVERAGE}" == "1" ]; then coveralls; fi