Merge pull request #25 from minrk/mac-test

test on mac

.travis.yml

@@ -9,9 +9,35 @@ python:
 branches:
   only:
     - master
+before_install:
+  - |
+    # setup mac virtualenv
+    if [[ $(uname) == "Darwin" ]]; then
+      brew install python
+      python3 -m pip install virtualenv
+      virtualenv -p $(which python$PY) ./test-env
+      source ./test-env/bin/activate
+    fi
 install:
   - pip install . -r dev-requirements.txt
+  - pip freeze
 script:
   - py.test --cov wurlitzer test.py
 after_success:
   - codecov
+env:
+  global:
+    - HOMEBREW_NO_AUTO_UPDATE=1
+matrix:
+  include:
+    - os: osx
+      language: generic
+      env:
+        - PY=2
+    - os: osx
+      language: generic
+      env:
+        - PY=3
+    - os: linux
+      dist: xenial
+      python: 3.7