Added Travis CI tests.

Gruntfile.js

@@ -21,6 +21,7 @@ module.exports = function( grunt ) {
 				],
 			},
 			options: {
+				bin: 'vendor/bin/phpcs',
 				standard: 'phpcs.ruleset.xml',
 				showSniffCodes: true
 			}

bin/install-wpcs

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# WordPress Coding Standards
+if [[ -d vendor/wp-coding-standards/wpcs ]]; then
+	vendor/bin/phpcs --config-set installed_paths vendor/wp-coding-standards/wpcs
+fi

bin/travis-after_success

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Coveralls
+if [[ '1' == $COVERAGE ]]; then
+	php vendor/bin/coveralls
+fi

bin/travis-before_script

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -ev
+
+phpenv local 5.6
+
+composer self-update
+
+if [[ '1' == $COVERAGE ]]; then
+	composer install
+else
+	composer install --no-dev
+fi
+
+phpenv local --unset
+
+phpenv rehash
+
+wget https://raw.githubusercontent.com/wp-cli/sample-plugin/master/bin/install-wp-tests.sh
+
+bash install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION 

bin/travis-script

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -ev
+
+# PHPUnit
+phpunit
+
+# Grunt
+if [[ '1' == $GRUNT ]]; then
+	npm install -g grunt-cli
+
+	npm install --no-optional
+
+	grunt
+fi

composer.json

@@ -28,10 +28,27 @@
 	},
 	"require": {
 		"php": ">=5.2.4",
+		"xrstf/composer-php52": "1.*",
 		"wp-pay/core": "^1.3.1",
 		"wp-pay-gateways/common": "dev-develop"
 	},
 	"require-dev": {
-		"satooshi/php-coveralls": "dev-master"
+		"phpmd/phpmd": "^2.2.3",
+		"satooshi/php-coveralls": "^0.7.1",
+		"squizlabs/php_codesniffer": "^2.2.0",
+		"wp-coding-standards/wpcs": "0.8.0",
+		"wp-cli/wp-cli": "^0.21.1"
+	},
+	"scripts": {
+		"post-install-cmd": [
+			"xrstf\\Composer52\\Generator::onPostInstallCmd"
+		],
+		"post-update-cmd": [
+			"xrstf\\Composer52\\Generator::onPostInstallCmd"
+		],
+		"post-autoload-dump": [
+			"xrstf\\Composer52\\Generator::onPostInstallCmd",
+			"bin/install-wpcs"
+		]
 	}
 }