diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..bbd2168
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,41 @@
+language: php
+
+cache:
+    directories:
+        - vendor
+
+matrix:
+    # mark as finished before allow_failures are run
+    fast_finish: true
+    include:
+        - php: 5.4
+        - php: 5.5
+        - php: 5.6
+        - php: 7.0
+
+# test only master (+ pull requests)
+branches:
+  only:
+    - master
+
+# make sure to update composer to latest available version
+before_install:
+    - composer self-update
+
+# install dependencies
+install: composer install --prefer-source
+
+# execute phpunit as the script command
+script:
+  - ./vendor/bin/phpunit -d memory_limit=-1 --colors -c phpunit.xml
+
+# disable mail notifications
+notification:
+  email: false
+
+# reduce depth (history) of git checkout
+git:
+  depth: 30
+
+# we don't need sudo
+sudo: false
diff --git a/Tests/Cache/NullTest.php b/Tests/Cache/NullTest.php
new file mode 100644
index 0000000..0626e5c
--- /dev/null
+++ b/Tests/Cache/NullTest.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Netgen\Bundle\OpenWeatherMapBundle\Tests\Cache;
+
+use Netgen\Bundle\OpenWeatherMapBundle\Cache\HandlerInterface;
+use Netgen\Bundle\OpenWeatherMapBundle\Cache\Null;
+
+class NullTest extends \PHPUnit_Framework_TestCase
+{
+    public function testInstanceOfHandlerInterface()
+    {
+        $this->assertInstanceOf(HandlerInterface::class, new Null());
+    }
+
+    public function testHasMethodMustAlwaysReturnFalse()
+    {
+        $nullHandler = new Null();
+
+        $this->assertFalse($nullHandler->has('some_key'));
+        $this->assertFalse($nullHandler->has('test'));
+        $this->assertFalse($nullHandler->has('weather'));
+    }
+
+    public function testGetMethodMustAlwaysReturnFalse()
+    {
+        $nullHandler = new Null();
+
+        $this->assertFalse($nullHandler->get('some_key'));
+        $this->assertFalse($nullHandler->get('test'));
+        $this->assertFalse($nullHandler->get('weather'));
+    }
+
+    public function testSetMethodShouldDoNothing()
+    {
+        $nullHandler = new Null();
+
+        $nullHandler->set('some_key', 'data', 120);
+        $nullHandler->set('test', 'data', 1000);
+        $nullHandler->set('weather', 'data', 3600);
+    }
+}
diff --git a/composer.json b/composer.json
index e1f362c..98256b7 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,11 @@
     "require": {
         "ezsystems/ezpublish-kernel": "*"
     },
+    "require-dev": {
+        "phpunit/phpunit": "*"
+    },
     "autoload": {
         "psr-0": { "Netgen\\Bundle\\OpenWeatherMapBundle": "" }
     },
     "target-dir": "Netgen/Bundle/OpenWeatherMapBundle"
-}
\ No newline at end of file
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..6c46e98
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,23 @@
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         colors="true"
+>
+    <testsuites>
+        <testsuite name="Netgen\OpenWeatherMapBundle\Tests">
+            <directory>Tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>.</directory>
+            <exclude>
+                <directory>Tests</directory>
+                <directory>vendor</directory>
+                <file>NetgenOpenWeatherMapBundle.php</file>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>