diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b619c6..5f0ab7e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.5.0] - 2020-08-24
+### Added
+- Interfaced container factory.
+
 ## [0.4.0] - 2020-06-27
 ### Added
 - Enabled possibility to have multiple AWS SSM adapters.
diff --git a/infection.json.dist b/infection.json.dist
index a6a4c73..74847b5 100644
--- a/infection.json.dist
+++ b/infection.json.dist
@@ -9,5 +9,9 @@
         "badge": {
             "branch": "master"
         }
+    },
+    "mutators": {
+        "@default": true,
+        "ProtectedVisibility": false
     }
 }
diff --git a/src/ConfigFactory.php b/src/ConfigFactory.php
index 55cbfe4..7efc786 100644
--- a/src/ConfigFactory.php
+++ b/src/ConfigFactory.php
@@ -5,14 +5,19 @@
 namespace PK\Config;
 
 use PK\Config\DependencyInjection\ContainerFactory;
+use PK\Config\DependencyInjection\ContainerFactoryInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 
 class ConfigFactory
 {
-    public static function create(string $configurationFile): ConfigInterface
-    {
-        $factory = new ContainerFactory();
-        $container = $factory->create($configurationFile);
+    public static function create(
+        string $configurationFile,
+        ?ContainerFactoryInterface $containerFactory = null
+    ): ConfigInterface {
+        if (!$containerFactory) {
+            $containerFactory = new ContainerFactory();
+        }
+        $container = $containerFactory->create($configurationFile);
         $config = $container->get('pk.config');
 
         if (!$config instanceof ConfigInterface) {
diff --git a/src/Console/Application.php b/src/Console/Application.php
index 45edb9d..c776101 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -4,7 +4,7 @@
 
 namespace PK\Config\Console;
 
-use PK\Config\DependencyInjection\ContainerFactory;
+use PK\Config\DependencyInjection\ContainerFactoryInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
 use Symfony\Component\Console\Application as BaseApplication;
 use Symfony\Component\Console\Command\Command;
@@ -20,11 +20,11 @@ class Application extends BaseApplication
     private $commandsRegistered = false;
 
     /**
-     * @var ContainerFactory
+     * @var ContainerFactoryInterface
      */
     protected $containerFactory;
 
-    public function __construct(ContainerFactory $containerFactory)
+    public function __construct(ContainerFactoryInterface $containerFactory)
     {
         $this->containerFactory = $containerFactory;
 
diff --git a/src/DependencyInjection/ContainerFactory.php b/src/DependencyInjection/ContainerFactory.php
index 4b5b0cd..fd3870d 100644
--- a/src/DependencyInjection/ContainerFactory.php
+++ b/src/DependencyInjection/ContainerFactory.php
@@ -10,21 +10,31 @@
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;
 
-class ContainerFactory
+class ContainerFactory implements ContainerFactoryInterface
 {
     public function create(?string $configurationFile = null): ContainerInterface
     {
-        $containerBuilder = new ContainerBuilder();
+        $containerBuilder = $this->getContainerBuilder();
         if ($configurationFile) {
             $containerBuilder->registerExtension(new PKConfigExtension());
         }
         $containerBuilder->addCompilerPass(new AddConsoleCommandPass());
 
-        $loader = new YamlFileLoader($containerBuilder, new FileLocator(__DIR__ . '/../..'));
-        $loader->load($configurationFile ?? 'src/Resources/config/services.yaml');
+        $this->loadConfiguration($containerBuilder, $configurationFile);
 
         $containerBuilder->compile();
 
         return $containerBuilder;
     }
+
+    protected function getContainerBuilder(): ContainerBuilder
+    {
+        return new ContainerBuilder();
+    }
+
+    protected function loadConfiguration(ContainerBuilder $containerBuilder, ?string $configurationFile): void
+    {
+        $loader = new YamlFileLoader($containerBuilder, new FileLocator(__DIR__ . '/../..'));
+        $loader->load($configurationFile ?? 'src/Resources/config/services.yaml');
+    }
 }
diff --git a/src/DependencyInjection/ContainerFactoryInterface.php b/src/DependencyInjection/ContainerFactoryInterface.php
new file mode 100644
index 0000000..c3b6620
--- /dev/null
+++ b/src/DependencyInjection/ContainerFactoryInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PK\Config\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+interface ContainerFactoryInterface
+{
+    public function create(?string $configurationFile = null): ContainerInterface;
+}
diff --git a/tests/ConfigFactoryTest.php b/tests/ConfigFactoryTest.php
index 03a070f..7039ede 100644
--- a/tests/ConfigFactoryTest.php
+++ b/tests/ConfigFactoryTest.php
@@ -7,17 +7,40 @@
 use PHPUnit\Framework\TestCase;
 use PK\Config\ConfigFactory;
 use PK\Config\ConfigInterface;
+use PK\Config\DependencyInjection\ContainerFactoryInterface;
 use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 
 class ConfigFactoryTest extends TestCase
 {
     public function testShouldThrowExceptionForInvalidConfiguration(): void
     {
         // given
+        $containerFactory = $this->createMock(ContainerFactoryInterface::class);
+        $container = $this->createMock(ContainerInterface::class);
+        $containerFactory->method('create')->willReturn($container);
+        $container->method('get')->willReturn(new \stdClass());
+
         $this->expectException(InvalidConfigurationException::class);
         $this->expectExceptionMessage(ConfigInterface::class);
 
         // when
-        ConfigFactory::create(realpath(__DIR__ . '/Fixtures/Resources/config/config_invalid.yaml'));
+        ConfigFactory::create('path', $containerFactory);
+    }
+
+    public function testShouldUseProvidedFactory(): void
+    {
+        // given
+        $containerFactory = $this->createMock(ContainerFactoryInterface::class);
+        $container = $this->createMock(ContainerInterface::class);
+        $containerFactory->method('create')->willReturn($container);
+        $config = $this->createMock(ConfigInterface::class);
+        $container->method('get')->willReturn($config);
+
+        // when
+        $actual = ConfigFactory::create('path', $containerFactory);
+
+        // then
+        $this->assertSame($config, $actual);
     }
 }
diff --git a/tests/Fixtures/InvalidConfig.php b/tests/Fixtures/InvalidConfig.php
deleted file mode 100644
index 0b3d875..0000000
--- a/tests/Fixtures/InvalidConfig.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace PK\Tests\Config\Fixtures;
-
-use PK\Config\Environment\EnvironmentInterface;
-
-class InvalidConfig
-{
-    /**
-     * @param EnvironmentInterface[] $environments
-     */
-    public function __construct(iterable $environments)
-    {
-    }
-}
diff --git a/tests/Fixtures/Resources/config/config_invalid.yaml b/tests/Fixtures/Resources/config/config_invalid.yaml
deleted file mode 100644
index 151f43d..0000000
--- a/tests/Fixtures/Resources/config/config_invalid.yaml
+++ /dev/null
@@ -1,5 +0,0 @@
-imports:
-    - { resource: config.yaml }
-
-parameters:
-    pk.config.class: PK\Tests\Config\Fixtures\InvalidConfig