diff --git a/.styleci.yml b/.styleci.yml
index 48feb9c49..9a1c54393 100644
--- a/.styleci.yml
+++ b/.styleci.yml
@@ -6,4 +6,5 @@ finder:
   not-name:
     - "*Stub.php"
   path:
-    - "src"
\ No newline at end of file
+    - "src"
+    - "tests"
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 000000000..612d6e93e
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,13 @@
+language: php
+
+php:
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
+
+before_script:
+  - travis_retry composer self-update
+  - travis_retry composer install --no-interaction --prefer-source
+
+script: phpunit --configuration phpunit.xml --coverage-text
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 345cb59a0..2f8ef80e6 100644
--- a/composer.json
+++ b/composer.json
@@ -44,6 +44,9 @@
 		"zendframework/zend-version": "^2.5",
 		"monolog/monolog": "^1.18"
 	},
+	"require-dev": {
+		"phpunit/phpunit": "^4.8"
+	},
 	"autoload": {
 		"psr-4": {
 			"TorrentPier\\": "src/"
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 000000000..9c2f15d79
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<phpunit
+        colors="true"
+        bootstrap="tests/bootstrap.php"
+        convertErrorsToExceptions="true"
+        convertNoticesToExceptions="true"
+        convertWarningsToExceptions="true"
+        beStrictAboutTestsThatDoNotTestAnything="true"
+        beStrictAboutOutputDuringTests="true"
+        beStrictAboutTestSize="true">
+    <testsuite name="TorrentPier">
+        <directory  suffix="Test.php">tests</directory>
+    </testsuite>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/src/Config.php b/src/Config.php
index bd6871edb..091a2a79f 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -4,6 +4,10 @@ namespace TorrentPier;
 
 use Zend\Config\Config as ZendConfig;
 
+/**
+ * Class Config
+ * @package TorrentPier
+ */
 class Config extends ZendConfig
 {
     protected $root;
@@ -43,7 +47,7 @@ class Config extends ZendConfig
                 $result = $this;
                 foreach ($keys as $key) {
                     $result = $result->get($key);
-                    if ($result === null) {
+                    if (null === $result) {
                         break;
                     }
                 }
@@ -55,6 +59,12 @@ class Config extends ZendConfig
         return $this->prepareValue($result);
     }
 
+    /**
+     * Parse value
+     *
+     * @param mixed $value
+     * @return mixed
+     */
     protected function prepareValue($value)
     {
         if (is_string($value)) {
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 000000000..ec633c733
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,6 @@
+<?php
+
+date_default_timezone_set('UTC');
+
+$autoLoader = include __DIR__ . '/../vendor/autoload.php';
+$autoLoader->addPsr4('TorrentPier\\', __DIR__ . '/src');
diff --git a/tests/src/ConfigTest.php b/tests/src/ConfigTest.php
new file mode 100644
index 000000000..f6871e58f
--- /dev/null
+++ b/tests/src/ConfigTest.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace TorrentPier;
+
+/**
+ * Class ConfigTest
+ * @package TorrentPier
+ */
+class ConfigTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var Config
+     */
+    public $config;
+
+    public function setUp()
+    {
+        $data = [
+            'key1' => 'value1',
+            'key2' => [
+                'key3' => 'value2',
+                'key4' => '{self.key1}',
+                'key5' => '{self.key2.key4}',
+            ]
+        ];
+
+        $this->config = new Config($data);
+    }
+
+    /**
+     * @covers \TorrentPier\Config::get
+     */
+    public function testGet()
+    {
+        $this->assertEquals($this->config->get('key1'), 'value1');
+        $this->assertEquals($this->config->get('key2.key3'), 'value2');
+        $this->assertEquals($this->config->get('key2.key4'), 'value1');
+        $this->assertEquals($this->config->get('key2.key5'), 'value1');
+        $this->assertEquals($this->config->get('key2')->get('key3'), 'value2');
+
+        $this->assertEquals($this->config['key1'], 'value1');
+        $this->assertEquals($this->config['key2.key3'], 'value2');
+        $this->assertEquals($this->config['key2.key4'], 'value1');
+        $this->assertEquals($this->config['key2.key5'], 'value1');
+        $this->assertEquals($this->config['key2']['key3'], 'value2');
+
+        $this->assertEquals($this->config['key2.key6'], null);
+    }
+
+    /**
+     * @covers \TorrentPier\Config::toArray
+     */
+    public function testToArray()
+    {
+        $this->assertEquals($this->config->toArray(), [
+            'key1' => 'value1',
+            'key2' => [
+                'key3' => 'value2',
+                'key4' => 'value1',
+                'key5' => 'value1',
+            ]
+        ]);
+    }
+}