Added tests.

.travis.yml

@@ -0,0 +1,38 @@
+sudo: false
+
+language: php
+
+matrix:
+  include:
+    - php: 5.2
+      env: WP_VERSION=latest WP_MULTISITE=1
+    - php: 5.2
+      env: WP_VERSION=4.0 WP_MULTISITE=1
+    - php: 5.3
+      env: WP_VERSION=4.0
+    - php: 5.4
+      env: WP_VERSION=4.0
+    - php: 5.5
+      env: WP_VERSION=4.0
+    - php: 5.6
+      env: WP_VERSION=4.0 COVERAGE=1 GRUNT=1
+    - php: 7.0
+      env: WP_VERSION=4.0
+    - php: hhvm
+      env: WP_VERSION=4.0
+  fast_finish: true
+
+cache:
+  directories:
+    - node_modules
+    - vendor
+    - $HOME/.composer/cache
+
+before_script:
+  - bash bin/travis-before_script
+
+script:
+  - bash bin/travis-script
+
+after_success:
+  - bash bin/travis-after_success

Gruntfile.js

@@ -0,0 +1,61 @@
+module.exports = function( grunt ) {
+	require( 'load-grunt-tasks' )( grunt );
+
+	// Project configuration.
+	grunt.initConfig( {
+		// Package
+		pkg: grunt.file.readJSON( 'package.json' ),
+
+		// JSHint
+		jshint: {
+			all: [ 'Gruntfile.js', 'composer.json', 'package.json' ]
+		},
+
+		// PHP Code Sniffer
+		phpcs: {
+			application: {
+				src: [
+					'**/*.php',
+					'!node_modules/**',
+					'!vendor/**'
+				]
+			},
+			options: {
+				bin: 'vendor/bin/phpcs',
+				standard: 'phpcs.ruleset.xml',
+				showSniffCodes: true
+			}
+		},
+
+		// PHPLint
+		phplint: {
+			options: {
+				phpArgs: {
+					'-lf': null
+				}
+			},
+			all: [ 'src/**/*.php' ]
+		},
+
+		// PHP Mess Detector
+		phpmd: {
+			application: {
+				dir: 'src'
+			},
+			options: {
+				bin: 'vendor/bin/phpmd',
+				exclude: 'node_modules',
+				reportFormat: 'xml',
+				rulesets: 'phpmd.ruleset.xml'
+			}
+		},
+
+		// PHPUnit
+		phpunit: {
+			application: {},
+		},
+	} );
+
+	// Default task(s).
+	grunt.registerTask( 'default', [ 'jshint', 'phplint', 'phpmd', 'phpcs', 'phpunit' ] );
+};

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

@@ -28,13 +28,30 @@
 	},
 	"require": {
 		"php": ">=5.2.4",
+		"xrstf/composer-php52": "1.*",
 		"wp-pay/core": "dev-develop",
 		"wp-pay-gateways/common": "dev-develop",
 		"wp-pay-gateways/ideal": "dev-develop",
 		"wp-pay-gateways/ideal-advanced": "dev-develop",
 		"wp-pay-gateways/ideal-advanced-v3": "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"
+		]
 	}
 }