test build php for osx in travis

.travis.yml

@@ -1,13 +1,26 @@
 language: php
 
-os:
-  - linux
+matrix:
+  fast_finish: true
 
-php:
-  - 7.0
+  include:
+    - os: linux
+      php: '7.0'
 
-before_script:
-  - composer install --ignore-platform-reqs
+    - os: osx
+      osx_image: xcode7.3
+      language: generic
+      env:
+        - _OSX=10.11
+        - _PHP: php70
+
+before_install:
+  - if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then /usr/bin/env bash build/prepare_osx_env.sh ; fi
+
+install:
+  - if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then /usr/bin/env bash tools/handle_brew_pkg.sh "${_PHP}" ; fi
+  - curl -s http://getcomposer.org/installer | php
+  - php composer.phar install --dev --no-interaction --ignore-platform-reqs
 
 script:
   - bin/phpunit

tools/handle_brew_pkg.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+
+if [[ "$#" -eq 1 ]]; then
+    echo "Handling \"$1\" brew package..."
+else
+    echo "Brew failed - invalid $0 call"
+    exit 1;
+fi
+
+if [[ $(brew ls --versions "$1") ]]; then
+    if brew outdated "$1"; then
+        echo "Package upgrade is not required, skipping"
+    else
+        echo "Updating package...";
+        brew upgrade "$1"
+        if [ $? -ne 0 ]; then
+            echo "Upgrade failed"
+            exit 1
+        fi
+    fi
+else
+    echo "Package not available - installing..."
+    brew install "$1"
+    if [ $? -ne 0 ]; then
+        echo "Install failed"
+        exit 1
+    fi
+fi
+
+echo "Linking installed package..."
+brew link "$1"

tools/prepare_osx_env.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+echo "Here's the OSX environment:"
+sw_vers
+brew --version
+
+echo "Updating brew..."
+brew update
+
+if [[ "${_PHP}" == "hhvm" ]]; then
+    echo "Adding brew HHVM dependencies..."
+    brew tap hhvm/hhvm
+
+else
+    echo "Adding brew PHP dependencies..."
+    brew tap homebrew/dupes
+    brew tap homebrew/versions
+    brew tap homebrew/homebrew-php
+fi