diff --git a/.gitignore b/.gitignore
index b2ba5381d..5c654a7ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,16 @@
 # Except those related to git and vagrant
 !.git*
 !.puppet*
+!.travis.yml
+!.mailmap
+
+# Testing - created by test/setup_vendor.sh
+/vendor/
+/Hamcrest*
+/Mockery*
+/Icinga
+/Zend
+/*.phar
 
 # Exclude application log files
 var/log/*
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 000000000..957e89cb3
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,39 @@
+language: php
+#dist: trusty
+sudo: required
+
+php:
+  - '5.3'
+  - '5.4'
+  - '5.5'
+  - '5.6'
+  - '7.0'
+  - '7.1'
+
+services:
+  - mysql
+  - postgresql
+
+cache:
+  directories:
+    - vendor
+
+branches:
+  only:
+  - master
+  - /^v\d/
+
+notifications:
+  email: false
+
+# also see: test/setup_vendor.sh
+before_script:
+  - sudo locale-gen en_US.UTF-8 de_DE.UTF-8 fr_FR.UTF-8
+  - test/travis_database.sh
+  - test/setup_vendor.sh
+
+script:
+  # also see: modules/test/application/clicommands/PhpCommand.php
+  # phpcs is disabled until fixed...
+  # - php phpcs.phar -p --standard=icingaweb2.ruleset.xml --extensions=php --encoding=utf-8 application/ library/Icinga modules/ test/
+  - php phpunit.phar -c modules/test/phpunit.xml --verbose
diff --git a/README.md b/README.md
index 2a7eeda69..25e812ede 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # Icinga Web 2
 
+[![Build Status](https://travis-ci.org/Icinga/icingaweb2.png?branch=master)](https://travis-ci.org/Icinga/icingaweb2)
+[![Github Tag](https://img.shields.io/github/tag/Icinga/icingaweb2.svg)](https://github.com/Icinga/icingaweb2)
+
 ![Icinga Logo](https://www.icinga.com/wp-content/uploads/2014/06/icinga_logo.png)
 
 1. [About](#about)
diff --git a/icingaweb2.ruleset.xml b/icingaweb2.ruleset.xml
index edbcec706..020f26c26 100644
--- a/icingaweb2.ruleset.xml
+++ b/icingaweb2.ruleset.xml
@@ -1,5 +1,5 @@
-<!-- PHP Codesniffer ruleset configuration -->
 <?xml version="1.0"?>
+<!-- PHP Codesniffer ruleset configuration -->
 <ruleset name="icingaweb2">
     <description>The default PSR-2 standard with specifically excluded non-critical sniffs</description>
     <!-- Include the whole PSR-2 standard -->
diff --git a/library/Icinga/Util/Json.php b/library/Icinga/Util/Json.php
index c2c1f7a6d..3bd988bc0 100644
--- a/library/Icinga/Util/Json.php
+++ b/library/Icinga/Util/Json.php
@@ -43,7 +43,12 @@ class Json
      */
     public static function decode($json, $assoc = false, $depth = 512, $options = 0)
     {
-        $decoded = json_decode($json, $assoc, $depth, $options);
+        if (version_compare(phpversion(), '5.4.0', '<')) {
+            $decoded = json_decode($json, $assoc, $depth);
+        } else {
+            $decoded = json_decode($json, $assoc, $depth, $options);
+        }
+
         if (json_last_error() !== JSON_ERROR_NONE) {
             throw new JsonDecodeException('%s: %s', static::lastErrorMsg(), var_export($json, true));
         }
diff --git a/modules/monitoring/test/php/library/Monitoring/Web/Rest/RestRequestTest.php b/modules/monitoring/test/php/library/Monitoring/Web/Rest/RestRequestTest.php
index 432ff8a26..e422ec076 100644
--- a/modules/monitoring/test/php/library/Monitoring/Web/Rest/RestRequestTest.php
+++ b/modules/monitoring/test/php/library/Monitoring/Web/Rest/RestRequestTest.php
@@ -3,7 +3,6 @@
 
 namespace Tests\Icinga\Modules\Monitoring\Web\Rest;
 
-use Icinga\Exception\Json\JsonDecodeException;
 use Icinga\Module\Monitoring\Web\Rest\RestRequest;
 use Icinga\Test\BaseTestCase;
 
@@ -18,7 +17,7 @@ class MockedRestRequest extends RestRequest
 class RestRequestTest extends BaseTestCase
 {
     /**
-     * @expectedException JsonDecodeException
+     * @expectedException \Icinga\Exception\Json\JsonDecodeException
      */
     public function testInvalidServerResponseHandling()
     {
diff --git a/test/php/bootstrap.php b/test/php/bootstrap.php
index 580013fd2..2c805e8b5 100644
--- a/test/php/bootstrap.php
+++ b/test/php/bootstrap.php
@@ -26,6 +26,10 @@ $mockeryLoader->register();
 
 require_once($icingaLibPath . '/Test/ClassLoader.php');
 
+if (! class_exists('PHPUnit_Framework_TestCase')) {
+    require_once __DIR__ . '/phpunit-compat.php';
+}
+
 $loader = new Icinga\Test\ClassLoader();
 $loader->registerNamespace('Tests', $testLibraryPath);
 $loader->registerNamespace('Icinga', $icingaLibPath);
diff --git a/test/php/phpunit-compat.php b/test/php/phpunit-compat.php
new file mode 100644
index 000000000..88287906d
--- /dev/null
+++ b/test/php/phpunit-compat.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * @codingStandardsIgnoreStart
+ */
+class PHPUnit_Framework_TestCase extends \PHPUnit\Framework\TestCase
+{
+}
+
+interface PHPUnit_Framework_Test extends \PHPUnit\Framework\Test
+{
+}
+
+interface PHPUnit_Framework_TestListener extends \PHPUnit\Framework\TestListener
+{
+}
diff --git a/test/setup_vendor.sh b/test/setup_vendor.sh
new file mode 100755
index 000000000..17ef47533
--- /dev/null
+++ b/test/setup_vendor.sh
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+set -ex
+
+ICINGAWEB_HOME=${ICINGAWEB_HOME:="$(dirname "$(readlink -f $(dirname "$0"))")"}
+PHP_VERSION="$(php -r 'echo phpversion();')"
+PHPCS_VERSION=${PHPCS_VERSION:=2.9.1}
+MOCKERY_VERSION=${MOCKERY_VERSION:=0.9.9}
+HAMCREST_VERSION=${HAMCREST_VERSION:=2.0.0}
+
+if [ "$PHP_VERSION" '<' 5.6.0 ]; then
+  PHPUNIT_VERSION=${PHPUNIT_VERSION:=4.8}
+else
+  PHPUNIT_VERSION=${PHPUNIT_VERSION:=5.7}
+fi
+
+cd ${ICINGAWEB_HOME}
+
+test -d vendor || mkdir vendor
+
+# phpunit
+phpunit_path="vendor/phpunit-${PHPUNIT_VERSION}"
+if [ ! -e "${phpunit_path}".phar ]; then
+  wget -O "${phpunit_path}".phar https://phar.phpunit.de/phpunit-${PHPUNIT_VERSION}.phar
+fi
+ln -svf "${phpunit_path}".phar phpunit.phar
+
+# phpcs
+phpcs_path="vendor/phpcs-${PHPCS_VERSION}"
+if [ ! -e "${phpcs_path}".phar ]; then
+  wget -O "${phpcs_path}".phar \
+    https://github.com/squizlabs/PHP_CodeSniffer/releases/download/${PHPCS_VERSION}/phpcs.phar
+fi
+ln -svf "${phpcs_path}".phar phpcs.phar
+
+# mockery
+mockery_path="vendor/mockery-${MOCKERY_VERSION}"
+if [ ! -e "${mockery_path}".tar.gz ]; then
+  wget -O "${mockery_path}".tar.gz \
+    https://github.com/mockery/mockery/archive/${MOCKERY_VERSION}.tar.gz
+fi
+if [ ! -d "${mockery_path}" ]; then
+  tar xf "${mockery_path}".tar.gz -C vendor/
+fi
+ln -svf "${mockery_path}"/library/Mockery
+ln -svf "${mockery_path}"/library/Mockery.php
+
+# hamcrest
+hamcrest_path="vendor/hamcrest-php-${HAMCREST_VERSION}"
+if [ ! -e "${hamcrest_path}".tar.gz ]; then
+  wget -O "${hamcrest_path}".tar.gz \
+    https://github.com/hamcrest/hamcrest-php/archive/v${HAMCREST_VERSION}.tar.gz
+fi
+if [ ! -d "${hamcrest_path}" ]; then
+  tar xf "${hamcrest_path}".tar.gz -C vendor/
+fi
+ln -svf "${hamcrest_path}"/hamcrest/Hamcrest
+ln -svf "${hamcrest_path}"/hamcrest/Hamcrest.php
diff --git a/test/travis_database.sh b/test/travis_database.sh
new file mode 100755
index 000000000..d03eb78c4
--- /dev/null
+++ b/test/travis_database.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -ex
+
+mysql -u root -e "GRANT ALL ON *.* TO icinga_unittest@localhost IDENTIFIED BY 'icinga_unittest'"
+
+export PGHOST=localhost
+export PGUSER=postgres
+
+psql -c "CREATE USER icinga_unittest WITH PASSWORD 'icinga_unittest'"
+psql -c "CREATE DATABASE icinga_unittest WITH OWNER icinga_unittest"