diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..12cf170
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,13 @@
+language: php
+php:
+  - "5.5"
+  - "5.4"
+  - "5.3"
+  - "5.2"
+
+before_script:
+  - ./tests/setup/schema.sh
+
+script:
+  - ./tests/syntax.sh
+  - phpunit --colors tests
diff --git a/tests/ALDVersionSwitchTest.php b/tests/ALDVersionSwitchTest.php
new file mode 100644
index 0000000..5225090
--- /dev/null
+++ b/tests/ALDVersionSwitchTest.php
@@ -0,0 +1,74 @@
+<?php
+require_once 'PHPUnit/Framework/TestCase.php';
+require_once dirname(__FILE__) . '/../ALDVersionSwitch.php';
+
+class ALDVersionSwitchTest extends PHPUnit_Framework_TestCase {
+
+	/**
+	* @dataProvider empty_switches
+	* @expectedException InvalidVersionSwitchException
+	* @expectedExceptionMessage Invalid switch data
+	*/
+	public function test_validate_empty($data) {
+		new ALDVersionSwitch($data);
+	}
+
+	public function empty_switches() {
+		$data = array(NULL,
+			      array(),
+			      'abc',
+			      1);
+		return array_map(create_function('$a', 'return array($a);'), $data);
+	}
+
+	/**
+	* @expectedException InvalidVersionSwitchException
+	* @expectedExceptionMessage Invalid switch data: unsupported fields
+	*/
+	public function test_validate_unknown() {
+		new ALDVersionSwitch(array('dummy' => 'error'));
+	}
+
+	/**
+	* @dataProvider invalid_ranges
+	* @expectedException InvalidVersionSwitchException
+	* @expectedExceptionMessage Invalid version range
+	*/
+	public function test_validate_range($data) {
+		new ALDVersionSwitch($data);
+	}
+
+	public function invalid_ranges() {
+		$data = array(array('min' => 1),
+			      array('max' => 2),
+			      array('min' => 1, 'max' => 2, 'dummy' => 'error'),
+			      array('error', 'min' => 1, 'max' => 2),
+			      array('min' => 2, 'max' => 1));
+		return array_map(create_function('$a', 'return array(array("version-range" => $a));'), $data);
+	}
+
+	/**
+	* @dataProvider invalid_lists
+	* @expectedException InvalidVersionSwitchException
+	* @expectedExceptionMessage Invalid version list
+	*/
+	public function test_validate_list($data) {
+		new ALDVersionSwitch($data);
+	}
+
+	public function invalid_lists() {
+		$data = array(NULL,
+			      array('a' => '2', '1', 2),
+			      array(1 => 'a', 'b', 'c'));
+		return array_map(create_function('$a', 'return array(array("version-list" => $a));'), $data);
+	}
+
+	/**
+	* @expectedException InvalidVersionSwitchException
+	* @expectedExceptionMessage Invalid version: must not be NULL
+	*/
+	public function test_validate_version() {
+		new ALDVersionSwitch(array('version' => NULL));
+	}
+}
+?>
\ No newline at end of file
diff --git a/tests/setup/schema.sh b/tests/setup/schema.sh
new file mode 100755
index 0000000..9cd526d
--- /dev/null
+++ b/tests/setup/schema.sh
@@ -0,0 +1,26 @@
+#! /usr/bin/env bash
+
+# get the current branch
+if [ ! -n "$TRAVIS_BRANCH" ]
+then
+  if [ ! -d ".git" ]
+  then
+    CURRENT_BRANCH="master"
+  else
+    CURRENT_BRANCH=`git rev-parse --abbrev-ref HEAD`
+  fi
+else
+  CURRENT_BRANCH="$TRAVIS_BRANCH"
+fi
+
+# check if the current branch also exists on ALD-API
+curl -s -f "https://api.github.com/repos/Library-Distribution/ALD-API/branches/$CURRENT_BRANCH" &> /dev/null
+if [ $? == 22 ]
+then
+  SCHEMA_BRANCH="master"
+else
+  SCHEMA_BRANCH="$CURRENT_BRANCH"
+fi
+
+# fetch the schema from github
+curl -s -f -H "Accept: application/vnd.github.3.raw" -o "package.xsd" "https://api.github.com/repos/Library-Distribution/ALD-API/contents/schema/package.xsd?ref=$SCHEMA_BRANCH"
\ No newline at end of file
diff --git a/tests/syntax.sh b/tests/syntax.sh
new file mode 100755
index 0000000..d8f1313
--- /dev/null
+++ b/tests/syntax.sh
@@ -0,0 +1,9 @@
+#! /usr/bin/env bash
+
+echo "Testing PHP syntax..."
+set -o pipefail
+
+for file in $(find . -name '*.php');
+do
+	php -l "$file" | sed 's/^/        /' || { echo 'Syntax check failed!'; exit 1; }
+done
\ No newline at end of file