diff --git a/.php_cs.dist.php b/.php_cs.dist.php
new file mode 100644
index 0000000..25039fb
--- /dev/null
+++ b/.php_cs.dist.php
@@ -0,0 +1,11 @@
+<?php
+
+$config = new PrestaShop\CodingStandards\CsFixer\Config();
+
+$config
+    ->setUsingCache(false)
+    ->getFinder()
+    ->in(__DIR__)
+    ->exclude('vendor');
+
+return $config;
diff --git a/composer.json b/composer.json
index 996459b..d7d3260 100644
--- a/composer.json
+++ b/composer.json
@@ -28,6 +28,9 @@
     },
     "scripts": {
         "phpunit": "./vendor/bin/phpunit --coverage-text",
-        "php-cs-fixer": "./vendor/bin/php-cs-fixer fix --config .php_cs.dist.php --diff"
-    }
-}
+        "php-cs-fixer": "./vendor/bin/php-cs-fixer fix --config .php_cs.dist.php --diff",
+        "header-stamp": "./vendor/bin/header-stamp --target=\".\" --license=./vendor/prestashop/header-stamp/assets/afl.txt --exclude=.github,vendor,tests"
+    },
+    "author": "PrestaShop",
+    "license": "AFL-3.0"
+}
\ No newline at end of file
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..6bccac6
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" backupGlobals="false" backupStaticAttributes="false" bootstrap="vendor/autoload.php" colors="true" convertErrorsToExceptions="true" convertNoticesToExceptions="true" convertWarningsToExceptions="true" processIsolation="false" stopOnFailure="false" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+  <coverage>
+    <include>
+        <directory suffix=".php">src</directory>
+    </include>
+    <report>
+      <clover outputFile="clover.xml"/>
+    </report>
+  </coverage>
+  <testsuites>
+    <testsuite name="all">
+      <directory>./tests</directory>
+    </testsuite>
+  </testsuites>
+  <logging/>
+</phpunit>
diff --git a/src/ServiceContainer/Contract/IContainerLogger.php b/src/ServiceContainer/Contract/IContainerLogger.php
index 7d16056..ec681db 100644
--- a/src/ServiceContainer/Contract/IContainerLogger.php
+++ b/src/ServiceContainer/Contract/IContainerLogger.php
@@ -1,5 +1,24 @@
 <?php
 
+/**
+ * Copyright since 2007 PrestaShop SA and Contributors
+ * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License version 3.0
+ * that is bundled with this package in the file LICENSE.md.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/AFL-3.0
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * @author    PrestaShop SA and Contributors <contact@prestashop.com>
+ * @copyright Since 2007 PrestaShop SA and Contributors
+ * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License version 3.0
+ */
+
 namespace PrestaShopCorp\LightweightContainer\ServiceContainer\Contract;
 
 interface IContainerLogger
@@ -31,4 +50,4 @@ public function warn($message);
      * @return mixed
      */
     public function error($message);
-}
\ No newline at end of file
+}
diff --git a/src/ServiceContainer/Contract/IServiceProvider.php b/src/ServiceContainer/Contract/IServiceProvider.php
index 8637241..4272930 100644
--- a/src/ServiceContainer/Contract/IServiceProvider.php
+++ b/src/ServiceContainer/Contract/IServiceProvider.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
diff --git a/src/ServiceContainer/Contract/ISingletonService.php b/src/ServiceContainer/Contract/ISingletonService.php
index a92fe39..2685265 100644
--- a/src/ServiceContainer/Contract/ISingletonService.php
+++ b/src/ServiceContainer/Contract/ISingletonService.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
diff --git a/src/ServiceContainer/Exception/ParameterNotFoundException.php b/src/ServiceContainer/Exception/ParameterNotFoundException.php
index 8b16a40..e2f41ba 100644
--- a/src/ServiceContainer/Exception/ParameterNotFoundException.php
+++ b/src/ServiceContainer/Exception/ParameterNotFoundException.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
diff --git a/src/ServiceContainer/Exception/ProviderNotFoundException.php b/src/ServiceContainer/Exception/ProviderNotFoundException.php
index 5ec3542..27b46bb 100644
--- a/src/ServiceContainer/Exception/ProviderNotFoundException.php
+++ b/src/ServiceContainer/Exception/ProviderNotFoundException.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
diff --git a/src/ServiceContainer/Exception/ServiceNotFoundException.php b/src/ServiceContainer/Exception/ServiceNotFoundException.php
index 253d06f..74db048 100644
--- a/src/ServiceContainer/Exception/ServiceNotFoundException.php
+++ b/src/ServiceContainer/Exception/ServiceNotFoundException.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
diff --git a/src/ServiceContainer/Provider/ExampleProvider.php b/src/ServiceContainer/Provider/ExampleProvider.php
index 9991c7c..d13297e 100644
--- a/src/ServiceContainer/Provider/ExampleProvider.php
+++ b/src/ServiceContainer/Provider/ExampleProvider.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
@@ -32,12 +33,12 @@ class ExampleProvider implements IServiceProvider
      */
     public function provide(ServiceContainer $container)
     {
-//        $container->registerProvider(MyService::class, static function () use ($container) {
-//            return new ServicesBillingClient(
-//                $container->getParameter('my_module.a_parameter'),
-//                $container->get(AaService::class),
-//                $container->get(BbService::class)
-//            );
-//        });
+        //        $container->registerProvider(MyService::class, static function () use ($container) {
+        //            return new ServicesBillingClient(
+        //                $container->getParameter('my_module.a_parameter'),
+        //                $container->get(AaService::class),
+        //                $container->get(BbService::class)
+        //            );
+        //        });
     }
 }
diff --git a/src/ServiceContainer/ServiceContainer.php b/src/ServiceContainer/ServiceContainer.php
index 9d6507d..8b99c16 100644
--- a/src/ServiceContainer/ServiceContainer.php
+++ b/src/ServiceContainer/ServiceContainer.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * Copyright since 2007 PrestaShop SA and Contributors
  * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
@@ -87,7 +88,7 @@ public function loadConfig()
     /**
      * @return IContainerLogger
      */
-    public abstract function getLogger();
+    abstract public function getLogger();
 
     /**
      * @return void
diff --git a/src/config.example.php b/src/config.example.php
index 9c5adfa..4492e8f 100644
--- a/src/config.example.php
+++ b/src/config.example.php
@@ -1,5 +1,24 @@
 <?php
 
+/**
+ * Copyright since 2007 PrestaShop SA and Contributors
+ * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Academic Free License version 3.0
+ * that is bundled with this package in the file LICENSE.md.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/AFL-3.0
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@prestashop.com so we can send you a copy immediately.
+ *
+ * @author    PrestaShop SA and Contributors <contact@prestashop.com>
+ * @copyright Since 2007 PrestaShop SA and Contributors
+ * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License version 3.0
+ */
+
 return [
     'my_module.a_parameter' => 'my value example',
     'my_module.log_level' => 'ERROR',
diff --git a/tests/src/ServiceContainer/ServiceContainerTest.php b/tests/src/ServiceContainer/ServiceContainerTest.php
index 42ce7a8..5c80364 100644
--- a/tests/src/ServiceContainer/ServiceContainerTest.php
+++ b/tests/src/ServiceContainer/ServiceContainerTest.php
@@ -3,14 +3,77 @@
 namespace PrestaShopCorp\LightweightContainer\Test\ServiceContainer;
 
 use PHPUnit\Framework\TestCase;
+use PrestaShopCorp\LightweightContainer\ServiceContainer\Exception\ParameterNotFoundException;
+use PrestaShopCorp\LightweightContainer\ServiceContainer\Exception\ServiceNotFoundException;
+use PrestaShopCorp\LightweightContainer\ServiceContainer\ServiceContainer;
+
+class TestService
+{
+    public function init()
+    {
+        // empty method
+    }
+}
 
 class ServiceContainerTest extends TestCase
 {
+    /**
+     * @var ServiceContainer
+     */
+    private $container;
+
+    public function setUp(): void
+    {
+        $this->container = TestServiceContainer::createInstance(__DIR__ . '/config.php');
+    }
+
+    /**
+     * @test
+     */
+    public function itShouldThrowServiceNotFoundExceptionIfProviderIsMissing()
+    {
+        $this->expectException(ServiceNotFoundException::class);
+
+        $this->container->get(TestService::class);
+    }
+
     /**
      * @test
      */
-    public function itShouldTestSomething()
+    public function itShouldThrowParameterNotFoundExceptionIfParameterNotFound()
     {
-        // TODO: implement tests
+        $this->expectException(ParameterNotFoundException::class);
+
+        $this->container->getParameter('foo.bar');
+    }
+
+    /**
+     * @test
+     */
+    public function itShouldGetConfigurationParameter()
+    {
+        $this->assertEquals('DEBUG', $this->container->getParameter('log_level'));
+    }
+
+    /**
+     * @test
+     */
+    public function itShouldInstantiateServiceOnlyOnce()
+    {
+        $service = $this->createMock(TestService::class);
+        $service->expects($this->once())->method('init');
+
+        $this->container->registerProvider(TestService::class, static function () use ($service) {
+            $service->init();
+
+            return $service;
+        });
+
+        $this->assertTrue($this->container->hasProvider(TestService::class));
+
+        $i = 0;
+        while ($i++ < 3) {
+            $this->assertInstanceOf(TestService::class, $this->container->get(TestService::class));
+        }
     }
 }
diff --git a/tests/src/ServiceContainer/TestLogger.php b/tests/src/ServiceContainer/TestLogger.php
new file mode 100644
index 0000000..ae48f74
--- /dev/null
+++ b/tests/src/ServiceContainer/TestLogger.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace PrestaShopCorp\LightweightContainer\Test\ServiceContainer;
+
+use PrestaShopCorp\LightweightContainer\ServiceContainer\Contract\IContainerLogger;
+
+class TestLogger implements IContainerLogger
+{
+    public function debug($message)
+    {
+        // TODO: Implement debug() method.
+    }
+
+    public function info($message)
+    {
+        // TODO: Implement info() method.
+    }
+
+    public function warn($message)
+    {
+        // TODO: Implement warn() method.
+    }
+
+    public function error($message)
+    {
+        // TODO: Implement error() method.
+    }
+}
diff --git a/tests/src/ServiceContainer/TestServiceContainer.php b/tests/src/ServiceContainer/TestServiceContainer.php
new file mode 100644
index 0000000..c502b0c
--- /dev/null
+++ b/tests/src/ServiceContainer/TestServiceContainer.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace PrestaShopCorp\LightweightContainer\Test\ServiceContainer;
+
+use PrestaShopCorp\LightweightContainer\ServiceContainer\ServiceContainer;
+
+class TestServiceContainer extends ServiceContainer
+{
+    public function getLogger()
+    {
+        return new TestLogger();
+    }
+}
diff --git a/tests/src/ServiceContainer/config.php b/tests/src/ServiceContainer/config.php
new file mode 100644
index 0000000..0c12625
--- /dev/null
+++ b/tests/src/ServiceContainer/config.php
@@ -0,0 +1,5 @@
+<?php
+
+return [
+    'log_level' => 'DEBUG',
+];