Test Mac OS X on Travis

Squashed by @clue, originally from reactphp#124

Author: andig

.travis.yml

@@ -15,12 +15,30 @@ matrix:
   include:
     - php: 5.3
       dist: precise
+  include:
+    - os: osx
+      language: generic
+      php: 7.0 # just to look right on travis
+      env:
+        - PACKAGE: php70
   allow_failures:
     - php: hhvm
 
 sudo: false
 
 install:
+  # OSX install inspired by https://github.com/kiler129/TravisCI-OSX-PHP
+  - |
+    if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then 
+      brew tap homebrew/homebrew-php 
+      echo "Installing PHP ..."
+      brew install "${PACKAGE}"
+      brew install "${PACKAGE}"-xdebug
+      brew link "${PACKAGE}"
+      echo "Installing composer ..."
+      curl -s http://getcomposer.org/installer | php
+      mv composer.phar /usr/local/bin/composer
+    fi
   - COMPOSER_ROOT_VERSION=`git describe --abbrev=0` composer install --no-interaction
 
 script: