diff --git a/lib/Doctrine/Migrations/Configuration/Loader/ArrayLoader.php b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationArray.php
similarity index 87%
rename from lib/Doctrine/Migrations/Configuration/Loader/ArrayLoader.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationArray.php
index c7970fcec6..441e8cc3f2 100644
--- a/lib/Doctrine/Migrations/Configuration/Loader/ArrayLoader.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationArray.php
@@ -2,12 +2,11 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Loader;
+namespace Doctrine\Migrations\Configuration\Configuration;
 
 use Closure;
 use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\InvalidConfigurationKey;
-use Doctrine\Migrations\Configuration\Exception\UnableToLoadResource;
+use Doctrine\Migrations\Configuration\Configuration\Exception\InvalidConfigurationKey;
 use Doctrine\Migrations\Metadata\Storage\TableMetadataStorageConfiguration;
 use Doctrine\Migrations\Tools\BooleanStringFormatter;
 use function assert;
@@ -16,20 +15,21 @@
 use function is_bool;
 use function is_callable;
 
-/**
- * @internal
- */
-final class ArrayLoader implements Loader
+final class ConfigurationArray implements ConfigurationLoader
 {
+    /** @var array<string,mixed> */
+    private $configurations;
+
     /**
-     * @param mixed $array
+     * @param array<string,mixed> $configurations
      */
-    public function load($array) : Configuration
+    public function __construct(array $configurations)
     {
-        if (! is_array($array)) {
-            throw UnableToLoadResource::with(static::class);
-        }
+        $this->configurations = $configurations;
+    }
 
+    public function getConfiguration() : Configuration
+    {
         $configMap = [
             'migrations_paths' => static function ($paths, Configuration $configuration) : void {
                 foreach ($paths as $namespace => $path) {
@@ -63,7 +63,7 @@ public function load($array) : Configuration
         ];
 
         $object = new Configuration();
-        self::applyConfigs($configMap, $object, $array);
+        self::applyConfigs($configMap, $object, $this->configurations);
 
         if ($object->getMetadataStorageConfiguration() === null) {
             $object->setMetadataStorageConfiguration(new TableMetadataStorageConfiguration());
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFile.php b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFile.php
new file mode 100644
index 0000000000..feeb9518a0
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFile.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use function dirname;
+use function realpath;
+
+abstract class ConfigurationFile implements ConfigurationLoader
+{
+    /** @var string */
+    protected $file;
+
+    public function __construct(string $file)
+    {
+        $this->file = $file;
+    }
+
+    /**
+     * @param array<string,string> $directories
+     *
+     * @return array<string,string>
+     */
+    final protected function getDirectoriesRelativeToFile(array $directories, string $file) : array
+    {
+        foreach ($directories as $ns => $dir) {
+            $path = realpath(dirname($file) . '/' . $dir);
+
+            $directories[$ns] = $path !== false ? $path : $dir;
+        }
+
+        return $directories;
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFileWithFallback.php b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFileWithFallback.php
new file mode 100644
index 0000000000..9b8daec4e8
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationFileWithFallback.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\Exception\MissingConfigurationFile;
+use Doctrine\Migrations\Tools\Console\Exception\FileTypeNotSupported;
+use function file_exists;
+
+/**
+ * The ConfigurationLoader class is responsible for getting the Configuration instance from one of the supported methods
+ * for defining the configuration for your migrations.
+ *
+ * @internal
+ */
+final class ConfigurationFileWithFallback implements ConfigurationLoader
+{
+    /** @var string|null */
+    private $file;
+
+    public function __construct(?string $file = null)
+    {
+        $this->file = $file;
+    }
+
+    public function getConfiguration() : Configuration
+    {
+        if ($this->file !== null) {
+            return $this->loadConfiguration($this->file);
+        }
+
+        /**
+         * If no config has been provided, look for default config file in the path.
+         */
+        $defaultFiles = [
+            'migrations.xml',
+            'migrations.yml',
+            'migrations.yaml',
+            'migrations.json',
+            'migrations.php',
+        ];
+
+        foreach ($defaultFiles as $file) {
+            if ($this->configurationFileExists($file)) {
+                return $this->loadConfiguration($file);
+            }
+        }
+
+        throw MissingConfigurationFile::new();
+    }
+
+    private function configurationFileExists(string $config) : bool
+    {
+        return file_exists($config);
+    }
+
+    /**
+     * @throws FileTypeNotSupported
+     */
+    private function loadConfiguration(string $file) : Configuration
+    {
+        return (new FormattedFile($file))->getConfiguration();
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationLoader.php b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationLoader.php
new file mode 100644
index 0000000000..680e603465
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/ConfigurationLoader.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+
+interface ConfigurationLoader
+{
+    public function getConfiguration() : Configuration;
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationFormat.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationFormat.php
new file mode 100644
index 0000000000..c88132a35a
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationFormat.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
+
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
+use LogicException;
+
+final class InvalidConfigurationFormat extends LogicException implements ConfigurationException
+{
+    public static function new() : self
+    {
+        return new self('The provided configuration file can not be parsed.');
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/InvalidConfigurationKey.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationKey.php
similarity index 70%
rename from lib/Doctrine/Migrations/Configuration/Exception/InvalidConfigurationKey.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationKey.php
index a0e48bc5fb..075c4850f4 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/InvalidConfigurationKey.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/InvalidConfigurationKey.php
@@ -2,8 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Exception;
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
 
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
 use LogicException;
 use function sprintf;
 
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/JsonNotValid.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/JsonNotValid.php
similarity index 64%
rename from lib/Doctrine/Migrations/Configuration/Exception/JsonNotValid.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/Exception/JsonNotValid.php
index b670ba31df..37cc0cf23f 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/JsonNotValid.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/JsonNotValid.php
@@ -2,8 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Exception;
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
 
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
 use LogicException;
 
 final class JsonNotValid extends LogicException implements ConfigurationException
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/Exception/MissingConfigurationFile.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/MissingConfigurationFile.php
new file mode 100644
index 0000000000..ef6f6b37ec
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/MissingConfigurationFile.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
+
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
+use LogicException;
+
+final class MissingConfigurationFile extends LogicException implements ConfigurationException
+{
+    public static function new() : self
+    {
+        return new self('It was not possible to locate any configuration file.');
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/XmlNotValid.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/XmlNotValid.php
similarity index 74%
rename from lib/Doctrine/Migrations/Configuration/Exception/XmlNotValid.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/Exception/XmlNotValid.php
index 566577ea53..afb7173881 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/XmlNotValid.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/XmlNotValid.php
@@ -2,8 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Exception;
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
 
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
 use LogicException;
 
 final class XmlNotValid extends LogicException implements ConfigurationException
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/YamlNotAvailable.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotAvailable.php
similarity index 73%
rename from lib/Doctrine/Migrations/Configuration/Exception/YamlNotAvailable.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotAvailable.php
index 6fc631c589..8307980381 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/YamlNotAvailable.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotAvailable.php
@@ -2,8 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Exception;
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
 
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
 use LogicException;
 
 final class YamlNotAvailable extends LogicException implements ConfigurationException
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/YamlNotValid.php b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotValid.php
similarity index 73%
rename from lib/Doctrine/Migrations/Configuration/Exception/YamlNotValid.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotValid.php
index 3343e47676..e2789fca72 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/YamlNotValid.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/Exception/YamlNotValid.php
@@ -2,8 +2,9 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Exception;
+namespace Doctrine\Migrations\Configuration\Configuration\Exception;
 
+use Doctrine\Migrations\Configuration\Exception\ConfigurationException;
 use LogicException;
 
 final class YamlNotValid extends LogicException implements ConfigurationException
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/ExistingConfiguration.php b/lib/Doctrine/Migrations/Configuration/Configuration/ExistingConfiguration.php
new file mode 100644
index 0000000000..ffb10ee028
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/ExistingConfiguration.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+
+final class ExistingConfiguration implements ConfigurationLoader
+{
+    /** @var Configuration */
+    private $configurations;
+
+    public function __construct(Configuration $configurations)
+    {
+        $this->configurations = $configurations;
+    }
+
+    public function getConfiguration() : Configuration
+    {
+        return $this->configurations;
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/FormattedFile.php b/lib/Doctrine/Migrations/Configuration/Configuration/FormattedFile.php
new file mode 100644
index 0000000000..8c5696a7aa
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/FormattedFile.php
@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use const PATHINFO_EXTENSION;
+use function count;
+use function pathinfo;
+
+/**
+ * @internal
+ */
+final class FormattedFile extends ConfigurationFile
+{
+    /** @var callable[] */
+    private $loaders = [];
+
+    private function setDefaultLoaders() : void
+    {
+        $this->loaders = [
+            'json' => static function ($file) : ConfigurationLoader {
+                return new JsonFile($file);
+            },
+            'php' => static function ($file) : ConfigurationLoader {
+                return new PhpFile($file);
+            },
+            'xml' => static function ($file) : ConfigurationLoader {
+                return new XmlFile($file);
+            },
+            'yaml' => static function ($file) : ConfigurationLoader {
+                return new YamlFile($file);
+            },
+            'yml' => static function ($file) : ConfigurationLoader {
+                return new YamlFile($file);
+            },
+        ];
+    }
+
+    public function getConfiguration() : Configuration
+    {
+        if (count($this->loaders) === 0) {
+            $this->setDefaultLoaders();
+        }
+
+        $extension = pathinfo($this->file, PATHINFO_EXTENSION);
+        if (! isset($this->loaders[$extension])) {
+            throw Configuration\Exception\InvalidConfigurationFormat::new();
+        }
+
+        return $this->loaders[$extension]($this->file)->getConfiguration();
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/JsonFile.php b/lib/Doctrine/Migrations/Configuration/Configuration/JsonFile.php
new file mode 100644
index 0000000000..49dcb749a8
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/JsonFile.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\Exception\JsonNotValid;
+use Doctrine\Migrations\Configuration\Exception\FileNotFound;
+use const JSON_ERROR_NONE;
+use function assert;
+use function file_exists;
+use function file_get_contents;
+use function json_decode;
+use function json_last_error;
+
+final class JsonFile extends ConfigurationFile
+{
+    public function getConfiguration() : Configuration
+    {
+        if (! file_exists($this->file)) {
+            throw FileNotFound::new();
+        }
+
+        $contents = file_get_contents($this->file);
+
+        assert($contents !== false);
+
+        $config = json_decode($contents, true);
+
+        if (json_last_error() !== JSON_ERROR_NONE) {
+            throw JsonNotValid::new();
+        }
+
+        if (isset($config['migrations_paths'])) {
+            $config['migrations_paths'] = $this->getDirectoriesRelativeToFile(
+                $config['migrations_paths'],
+                $this->file
+            );
+        }
+
+        return (new ConfigurationArray($config))->getConfiguration();
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Configuration/PhpFile.php b/lib/Doctrine/Migrations/Configuration/Configuration/PhpFile.php
new file mode 100644
index 0000000000..1c379233e3
--- /dev/null
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/PhpFile.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Exception\FileNotFound;
+use function assert;
+use function file_exists;
+use function is_array;
+
+final class PhpFile extends ConfigurationFile
+{
+    public function getConfiguration() : Configuration
+    {
+        if (! file_exists($this->file)) {
+            throw FileNotFound::new();
+        }
+        $config = require $this->file;
+        if ($config instanceof Configuration) {
+            return $config;
+        }
+
+        assert(is_array($config));
+        if (isset($config['migrations_paths'])) {
+            $config['migrations_paths'] = $this->getDirectoriesRelativeToFile(
+                $config['migrations_paths'],
+                $this->file
+            );
+        }
+
+        return (new ConfigurationArray($config))->getConfiguration();
+    }
+}
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/XML/configuration.xsd b/lib/Doctrine/Migrations/Configuration/Configuration/XML/configuration.xsd
similarity index 100%
rename from lib/Doctrine/Migrations/Configuration/Loader/XML/configuration.xsd
rename to lib/Doctrine/Migrations/Configuration/Configuration/XML/configuration.xsd
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/XmlFileLoader.php b/lib/Doctrine/Migrations/Configuration/Configuration/XmlFile.php
similarity index 80%
rename from lib/Doctrine/Migrations/Configuration/Loader/XmlFileLoader.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/XmlFile.php
index dabcf03f60..ba87744d7e 100644
--- a/lib/Doctrine/Migrations/Configuration/Loader/XmlFileLoader.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/XmlFile.php
@@ -2,11 +2,11 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Loader;
+namespace Doctrine\Migrations\Configuration\Configuration;
 
 use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\Exception\XmlNotValid;
 use Doctrine\Migrations\Configuration\Exception\FileNotFound;
-use Doctrine\Migrations\Configuration\Exception\XmlNotValid;
 use Doctrine\Migrations\Tools\BooleanStringFormatter;
 use DOMDocument;
 use SimpleXMLElement;
@@ -20,31 +20,17 @@
 use function simplexml_load_string;
 use function strtr;
 
-/**
- * @internal
- */
-final class XmlFileLoader extends AbstractFileLoader
+final class XmlFile extends ConfigurationFile
 {
-    /** @var ArrayLoader */
-    private $arrayLoader;
-
-    public function __construct()
-    {
-        $this->arrayLoader = new ArrayLoader();
-    }
-
-    /**
-     * @param mixed|string $file
-     */
-    public function load($file) : Configuration
+    public function getConfiguration() : Configuration
     {
-        if (! file_exists($file)) {
+        if (! file_exists($this->file)) {
             throw FileNotFound::new();
         }
 
-        $this->validateXml($file);
+        $this->validateXml($this->file);
 
-        $rawXML = file_get_contents($file);
+        $rawXML = file_get_contents($this->file);
         assert($rawXML !== false);
 
         $root = simplexml_load_string($rawXML, SimpleXMLElement::class, LIBXML_NOCDATA);
@@ -59,13 +45,13 @@ public function load($file) : Configuration
             );
         }
         if (isset($config['migrations_paths'])) {
-            $config['migrations_paths'] = $this->getDirectoryRelativeToFile(
-                $file,
-                $config['migrations_paths']
+            $config['migrations_paths'] = $this->getDirectoriesRelativeToFile(
+                $config['migrations_paths'],
+                $this->file
             );
         }
 
-        return $this->arrayLoader->load($config);
+        return (new ConfigurationArray($config))->getConfiguration();
     }
 
     /**
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/YamlFileLoader.php b/lib/Doctrine/Migrations/Configuration/Configuration/YamlFile.php
similarity index 53%
rename from lib/Doctrine/Migrations/Configuration/Loader/YamlFileLoader.php
rename to lib/Doctrine/Migrations/Configuration/Configuration/YamlFile.php
index b75e64c340..5d756cc647 100644
--- a/lib/Doctrine/Migrations/Configuration/Loader/YamlFileLoader.php
+++ b/lib/Doctrine/Migrations/Configuration/Configuration/YamlFile.php
@@ -2,12 +2,12 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Configuration\Loader;
+namespace Doctrine\Migrations\Configuration\Configuration;
 
 use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\Exception\YamlNotAvailable;
+use Doctrine\Migrations\Configuration\Configuration\Exception\YamlNotValid;
 use Doctrine\Migrations\Configuration\Exception\FileNotFound;
-use Doctrine\Migrations\Configuration\Exception\YamlNotAvailable;
-use Doctrine\Migrations\Configuration\Exception\YamlNotValid;
 use Symfony\Component\Yaml\Exception\ParseException;
 use Symfony\Component\Yaml\Yaml;
 use function assert;
@@ -16,33 +16,19 @@
 use function file_get_contents;
 use function is_array;
 
-/**
- * @internal
- */
-final class YamlFileLoader extends AbstractFileLoader
+final class YamlFile extends ConfigurationFile
 {
-    /** @var ArrayLoader */
-    private $arrayLoader;
-
-    public function __construct()
-    {
-        $this->arrayLoader = new ArrayLoader();
-    }
-
-    /**
-     * @param mixed $file
-     */
-    public function load($file) : Configuration
+    public function getConfiguration() : Configuration
     {
         if (! class_exists(Yaml::class)) {
             throw YamlNotAvailable::new();
         }
 
-        if (! file_exists($file)) {
+        if (! file_exists($this->file)) {
             throw FileNotFound::new();
         }
 
-        $content = file_get_contents($file);
+        $content = file_get_contents($this->file);
 
         assert($content !== false);
 
@@ -57,12 +43,12 @@ public function load($file) : Configuration
         }
 
         if (isset($config['migrations_paths'])) {
-            $config['migrations_paths'] = $this->getDirectoryRelativeToFile(
-                $file,
-                $config['migrations_paths']
+            $config['migrations_paths'] = $this->getDirectoriesRelativeToFile(
+                $config['migrations_paths'],
+                $this->file
             );
         }
 
-        return $this->arrayLoader->load($config);
+        return (new ConfigurationArray($config))->getConfiguration();
     }
 }
diff --git a/lib/Doctrine/Migrations/Configuration/ConfigurationLoader.php b/lib/Doctrine/Migrations/Configuration/ConfigurationLoader.php
deleted file mode 100644
index 0e15127df4..0000000000
--- a/lib/Doctrine/Migrations/Configuration/ConfigurationLoader.php
+++ /dev/null
@@ -1,53 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration;
-
-use Doctrine\Migrations\Configuration\Exception\UnknownLoader;
-use Doctrine\Migrations\Configuration\Loader\ArrayLoader;
-use Doctrine\Migrations\Configuration\Loader\JsonFileLoader;
-use Doctrine\Migrations\Configuration\Loader\Loader;
-use Doctrine\Migrations\Configuration\Loader\PhpFileLoader;
-use Doctrine\Migrations\Configuration\Loader\XmlFileLoader;
-use Doctrine\Migrations\Configuration\Loader\YamlFileLoader;
-use function count;
-
-/**
- * @internal
- */
-class ConfigurationLoader
-{
-    /** @var Loader[] */
-    private $loaders = [];
-
-    public function addLoader(string $type, Loader $loader) : void
-    {
-        $this->loaders[$type] = $loader;
-    }
-
-    private function setDefaultLoaders() : void
-    {
-        $this->loaders = [
-            'array' => new ArrayLoader(),
-            'json' => new JsonFileLoader(),
-            'php' => new PhpFileLoader(),
-            'xml' => new XmlFileLoader(),
-            'yaml' => new YamlFileLoader(),
-            'yml' => new YamlFileLoader(),
-        ];
-    }
-
-    public function getLoader(string $type) : Loader
-    {
-        if (count($this->loaders) === 0) {
-            $this->setDefaultLoaders();
-        }
-
-        if (! isset($this->loaders[$type])) {
-            throw UnknownLoader::new($type);
-        }
-
-        return $this->loaders[$type];
-    }
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/FileNotFound.php b/lib/Doctrine/Migrations/Configuration/Exception/FileNotFound.php
index 1577f1051c..d7e5a9f52d 100644
--- a/lib/Doctrine/Migrations/Configuration/Exception/FileNotFound.php
+++ b/lib/Doctrine/Migrations/Configuration/Exception/FileNotFound.php
@@ -10,6 +10,6 @@ final class FileNotFound extends InvalidArgumentException implements Configurati
 {
     public static function new() : self
     {
-        return new self('Given config file does not exist');
+        return new self('Given configuration file does not exist');
     }
 }
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/UnableToLoadResource.php b/lib/Doctrine/Migrations/Configuration/Exception/UnableToLoadResource.php
deleted file mode 100644
index af36504e2d..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Exception/UnableToLoadResource.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Exception;
-
-use LogicException;
-use function sprintf;
-
-final class UnableToLoadResource extends LogicException implements ConfigurationException
-{
-    public static function with(string $loader) : self
-    {
-        return new self(sprintf('The provided resource can not be loaded by the loader "%s".', $loader), 10);
-    }
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Exception/UnknownLoader.php b/lib/Doctrine/Migrations/Configuration/Exception/UnknownLoader.php
deleted file mode 100644
index 3002ff437c..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Exception/UnknownLoader.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Exception;
-
-use LogicException;
-use function sprintf;
-
-final class UnknownLoader extends LogicException implements ConfigurationException
-{
-    public static function new(string $loader) : self
-    {
-        return new self(sprintf('Unknown configuration loader "%s".', $loader), 10);
-    }
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/AbstractFileLoader.php b/lib/Doctrine/Migrations/Configuration/Loader/AbstractFileLoader.php
deleted file mode 100644
index 6aedabbd5e..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Loader/AbstractFileLoader.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Loader;
-
-use function dirname;
-use function realpath;
-
-/**
- * @internal
- */
-abstract class AbstractFileLoader implements Loader
-{
-    /**
-     * @param array<string,string> $input
-     *
-     * @return array<string,string>
-     */
-    final protected function getDirectoryRelativeToFile(string $file, array $input) : array
-    {
-        foreach ($input as $ns => $dir) {
-            $path = realpath(dirname($file) . '/' . $dir);
-
-            $input[$ns] = $path !== false ? $path : $dir;
-        }
-
-        return $input;
-    }
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/JsonFileLoader.php b/lib/Doctrine/Migrations/Configuration/Loader/JsonFileLoader.php
deleted file mode 100644
index 33946685cb..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Loader/JsonFileLoader.php
+++ /dev/null
@@ -1,58 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\FileNotFound;
-use Doctrine\Migrations\Configuration\Exception\JsonNotValid;
-use const JSON_ERROR_NONE;
-use function assert;
-use function file_exists;
-use function file_get_contents;
-use function json_decode;
-use function json_last_error;
-
-/**
- * @internal
- */
-final class JsonFileLoader extends AbstractFileLoader
-{
-    /** @var ArrayLoader */
-    private $arrayLoader;
-
-    public function __construct()
-    {
-        $this->arrayLoader = new ArrayLoader();
-    }
-
-    /**
-     * @param mixed $file
-     */
-    public function load($file) : Configuration
-    {
-        if (! file_exists($file)) {
-            throw FileNotFound::new();
-        }
-
-        $contents = file_get_contents($file);
-
-        assert($contents !== false);
-
-        $config = json_decode($contents, true);
-
-        if (json_last_error() !== JSON_ERROR_NONE) {
-            throw JsonNotValid::new();
-        }
-
-        if (isset($config['migrations_paths'])) {
-            $config['migrations_paths'] = $this->getDirectoryRelativeToFile(
-                $file,
-                $config['migrations_paths']
-            );
-        }
-
-        return $this->arrayLoader->load($config);
-    }
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/Loader.php b/lib/Doctrine/Migrations/Configuration/Loader/Loader.php
deleted file mode 100644
index 80e6190ce8..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Loader/Loader.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-
-interface Loader
-{
-    /**
-     * @param mixed $resource
-     */
-    public function load($resource) : Configuration;
-}
diff --git a/lib/Doctrine/Migrations/Configuration/Loader/PhpFileLoader.php b/lib/Doctrine/Migrations/Configuration/Loader/PhpFileLoader.php
deleted file mode 100644
index fb92f07da6..0000000000
--- a/lib/Doctrine/Migrations/Configuration/Loader/PhpFileLoader.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\FileNotFound;
-use function assert;
-use function file_exists;
-use function is_array;
-
-/**
- * @internal
- */
-final class PhpFileLoader extends AbstractFileLoader
-{
-    /** @var ArrayLoader */
-    private $arrayLoader;
-
-    public function __construct()
-    {
-        $this->arrayLoader = new ArrayLoader();
-    }
-
-    /**
-     * @param mixed $file
-     */
-    public function load($file) : Configuration
-    {
-        if (! file_exists($file)) {
-            throw FileNotFound::new();
-        }
-        $config = require $file;
-        if ($config instanceof Configuration) {
-            return $config;
-        }
-
-        assert(is_array($config));
-        if (isset($config['migrations_paths'])) {
-            $config['migrations_paths'] = $this->getDirectoryRelativeToFile(
-                $file,
-                $config['migrations_paths']
-            );
-        }
-
-        return $this->arrayLoader->load($config);
-    }
-}
diff --git a/lib/Doctrine/Migrations/Tools/Console/Helper/MigrationsConfigurationHelper.php b/lib/Doctrine/Migrations/Tools/Console/Helper/MigrationsConfigurationHelper.php
deleted file mode 100644
index 0c317a8503..0000000000
--- a/lib/Doctrine/Migrations/Tools/Console/Helper/MigrationsConfigurationHelper.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tools\Console\Helper;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\ConfigurationLoader;
-use Doctrine\Migrations\Configuration\Exception\UnknownLoader;
-use Doctrine\Migrations\Tools\Console\Exception\FileTypeNotSupported;
-use Symfony\Component\Console\Helper\Helper;
-use Symfony\Component\Console\Input\InputInterface;
-use const PATHINFO_EXTENSION;
-use function file_exists;
-use function is_string;
-use function pathinfo;
-
-/**
- * The MigrationsConfigurationHelper class is responsible for getting the Configuration instance from one of the supported methods
- * for defining the configuration for your migrations.
- */
-final class MigrationsConfigurationHelper extends Helper implements ConfigurationHelper
-{
-    /** @var ConfigurationLoader */
-    private $loader;
-
-    public function __construct(?ConfigurationLoader $loader = null)
-    {
-        $this->loader = $loader ?: new ConfigurationLoader();
-    }
-
-    public function getConfiguration(InputInterface $input) : Configuration
-    {
-        /**
-         * If a configuration option is passed to the command line, use that configuration
-         * instead of any other one.
-         */
-        $configurationFile = $input->getOption('configuration');
-
-        if ($configurationFile !== null && is_string($configurationFile)) {
-            return $this->loadConfig($configurationFile);
-        }
-
-        /**
-         * If no any other config has been found, look for default config file in the path.
-         */
-        $defaultConfig = [
-            'migrations.xml',
-            'migrations.yml',
-            'migrations.yaml',
-            'migrations.json',
-            'migrations.php',
-        ];
-
-        foreach ($defaultConfig as $config) {
-            if ($this->configExists($config)) {
-                return $this->loadConfig($config);
-            }
-        }
-
-        return $this->loader->getLoader('array')->load([]);
-    }
-
-    private function configExists(string $config) : bool
-    {
-        return file_exists($config);
-    }
-
-    /**
-     * @throws FileTypeNotSupported
-     */
-    private function loadConfig(string $configFile) : Configuration
-    {
-        $extension = pathinfo($configFile, PATHINFO_EXTENSION);
-
-        try {
-            return $this->loader->getLoader($extension)->load($configFile);
-        } catch (UnknownLoader $e) {
-            throw FileTypeNotSupported::new();
-        }
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getName() : string
-    {
-        return 'configuration';
-    }
-}
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 40660c1334..066e88f29b 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -14,7 +14,7 @@ parameters:
         - '~Variable method call on Doctrine\\Migrations\\AbstractMigration~'
         -
             message: '~^Variable property access on mixed\.$~'
-            path: %currentWorkingDirectory%/lib/Doctrine/Migrations/Configuration/Loader/XmlFileLoader.php
+            path: %currentWorkingDirectory%/lib/Doctrine/Migrations/Configuration/Configuration/XmlFile.php
         -
             message: '~^Call to function is_bool\(\) with bool will always evaluate to true\.$~'
             path: %currentWorkingDirectory%/lib/Doctrine/Migrations/InlineParameterFormatter.php
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ArrayLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ArrayLoaderTest.php
new file mode 100644
index 0000000000..e8471a045c
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ArrayLoaderTest.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration\ConfigurationArray;
+use Doctrine\Migrations\Configuration\Configuration\Exception\InvalidConfigurationKey;
+use PHPUnit\Framework\TestCase;
+
+class ArrayLoaderTest extends TestCase
+{
+    public function testInvalidKey() : void
+    {
+        $this->expectException(InvalidConfigurationKey::class);
+        $this->expectExceptionMessage('Migrations configuration key "foo" does not exist');
+        $loader = new ConfigurationArray(['foo' => 'aaa']);
+        $loader->getConfiguration();
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ConfigurationFileWithFallbackTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ConfigurationFileWithFallbackTest.php
new file mode 100644
index 0000000000..09971c40c2
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/ConfigurationFileWithFallbackTest.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration\ConfigurationFileWithFallback;
+use Doctrine\Migrations\Configuration\Configuration\Exception\MissingConfigurationFile;
+use PHPUnit\Framework\TestCase;
+use function chdir;
+use function getcwd;
+
+class ConfigurationFileWithFallbackTest extends TestCase
+{
+    public function testFileLoader() : void
+    {
+        $dir = getcwd() ?: '.';
+        chdir(__DIR__ . '/../_files_loader');
+
+        try {
+            $loader        = new ConfigurationFileWithFallback(__DIR__ . '/../_files/config.php');
+            $configuration = $loader->getConfiguration();
+
+            self::assertSame('Doctrine Sandbox Migrations', $configuration->getName());
+        } finally {
+            chdir($dir);
+        }
+    }
+
+    public function testFileLoaderFallback() : void
+    {
+        $dir = getcwd() ?: '.';
+        chdir(__DIR__ . '/../_files_loader');
+
+        try {
+            $loader        = new ConfigurationFileWithFallback();
+            $configuration = $loader->getConfiguration();
+
+            self::assertSame('Doctrine Sandbox Migrations FilesLoader', $configuration->getName());
+        } finally {
+            chdir($dir);
+        }
+    }
+
+    public function testMissingConfig() : void
+    {
+        $this->expectException(MissingConfigurationFile::class);
+        $loader        = new ConfigurationFileWithFallback();
+        $configuration = $loader->getConfiguration();
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/FormattedFileTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/FormattedFileTest.php
new file mode 100644
index 0000000000..138e7e8fc8
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/FormattedFileTest.php
@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration\Exception\InvalidConfigurationFormat;
+use Doctrine\Migrations\Configuration\Configuration\FormattedFile;
+use PHPUnit\Framework\TestCase;
+
+class FormattedFileTest extends TestCase
+{
+    public function testUnknownLoader() : void
+    {
+        $this->expectException(InvalidConfigurationFormat::class);
+
+        $loader = new FormattedFile('migrations.abc');
+        $loader->getConfiguration();
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/JsonLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/JsonLoaderTest.php
new file mode 100644
index 0000000000..91b1e0489d
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/JsonLoaderTest.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\JsonFile;
+
+class JsonLoaderTest extends LoaderTest
+{
+    public function load(string $prefix = '') : Configuration
+    {
+        $loader = new JsonFile(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.json');
+
+        return $loader->getConfiguration();
+    }
+
+    public function testMalformed() : void
+    {
+        $this->expectException(Configuration\Exception\JsonNotValid::class);
+        $this->load('malformed');
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/AbstractLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/LoaderTest.php
similarity index 95%
rename from tests/Doctrine/Migrations/Tests/Configuration/Loader/AbstractLoaderTest.php
rename to tests/Doctrine/Migrations/Tests/Configuration/Configuration/LoaderTest.php
index 65ce44184b..e9bf96b91d 100644
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/AbstractLoaderTest.php
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/LoaderTest.php
@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
 
 use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\InvalidConfigurationKey;
+use Doctrine\Migrations\Configuration\Configuration\Exception\InvalidConfigurationKey;
 use Doctrine\Migrations\Exception\MigrationException;
 use Doctrine\Migrations\Metadata\Storage\TableMetadataStorageConfiguration;
 use InvalidArgumentException;
@@ -13,7 +13,7 @@
 use const DIRECTORY_SEPARATOR;
 use function dirname;
 
-abstract class AbstractLoaderTest extends TestCase
+abstract class LoaderTest extends TestCase
 {
     abstract public function load(string $prefix = '') : Configuration;
 
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/PhpLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/PhpLoaderTest.php
similarity index 50%
rename from tests/Doctrine/Migrations/Tests/Configuration/Loader/PhpLoaderTest.php
rename to tests/Doctrine/Migrations/Tests/Configuration/Configuration/PhpLoaderTest.php
index f76cc622c8..9a00286dac 100644
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/PhpLoaderTest.php
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/PhpLoaderTest.php
@@ -2,18 +2,18 @@
 
 declare(strict_types=1);
 
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
 
 use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Loader\PhpFileLoader;
+use Doctrine\Migrations\Configuration\Configuration\PhpFile;
 
-class PhpLoaderTest extends AbstractLoaderTest
+class PhpLoaderTest extends LoaderTest
 {
     public function load(string $prefix = '') : Configuration
     {
-        $loader = new PhpFileLoader();
+        $loader = new PhpFile(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.php');
 
-        return $loader->load(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.php');
+        return $loader->getConfiguration();
     }
 
     public function testLoadInline() : void
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/XmlLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/XmlLoaderTest.php
new file mode 100644
index 0000000000..e0dfbd1b90
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/XmlLoaderTest.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\XmlFile;
+
+class XmlLoaderTest extends LoaderTest
+{
+    public function load(string $prefix = '') : Configuration
+    {
+        $loader = new XmlFile(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.xml');
+
+        return $loader->getConfiguration();
+    }
+
+    public function testConfigurationWithInvalidOption() : void
+    {
+        $this->expectException(Configuration\Exception\XmlNotValid::class);
+
+        $this->load('invalid');
+    }
+
+    public function testMalformed() : void
+    {
+        $this->expectException(Configuration\Exception\XmlNotValid::class);
+
+        $this->load('malformed');
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Configuration/YamlLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/YamlLoaderTest.php
new file mode 100644
index 0000000000..6ba6f8746b
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/Configuration/YamlLoaderTest.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Migrations\Tests\Configuration\Configuration;
+
+use Doctrine\Migrations\Configuration\Configuration;
+use Doctrine\Migrations\Configuration\Configuration\YamlFile;
+
+class YamlLoaderTest extends LoaderTest
+{
+    public function load(string $prefix = '') : Configuration
+    {
+        $loader = new YamlFile(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.yml');
+
+        return $loader->getConfiguration();
+    }
+
+    public function testMalformed() : void
+    {
+        $this->expectException(Configuration\Exception\YamlNotValid::class);
+
+        $this->load('malformed');
+    }
+}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/ConfigurationLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/ConfigurationLoaderTest.php
deleted file mode 100644
index 05b21af59a..0000000000
--- a/tests/Doctrine/Migrations/Tests/Configuration/ConfigurationLoaderTest.php
+++ /dev/null
@@ -1,57 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tests\Configuration;
-
-use Doctrine\Migrations\Configuration\ConfigurationLoader;
-use Doctrine\Migrations\Configuration\Exception\UnknownLoader;
-use Doctrine\Migrations\Configuration\Loader\ArrayLoader;
-use Doctrine\Migrations\Configuration\Loader\JsonFileLoader;
-use Doctrine\Migrations\Configuration\Loader\Loader;
-use Doctrine\Migrations\Configuration\Loader\PhpFileLoader;
-use Doctrine\Migrations\Configuration\Loader\XmlFileLoader;
-use Doctrine\Migrations\Configuration\Loader\YamlFileLoader;
-use PHPUnit\Framework\TestCase;
-
-class ConfigurationLoaderTest extends TestCase
-{
-    /** @var ConfigurationLoader */
-    private $loader;
-
-    public function setUp() : void
-    {
-        $this->loader = new ConfigurationLoader();
-    }
-
-    public function testAdd() : void
-    {
-        $loader = $this->createMock(Loader::class);
-        $this->loader->addLoader('foo', $loader);
-
-        self::assertSame($loader, $this->loader->getLoader('foo'));
-    }
-
-    public function testUnknownLoader() : void
-    {
-        $this->expectException(UnknownLoader::class);
-        $this->expectExceptionMessage('Unknown configuration loader "foo".');
-        $this->loader->getLoader('foo');
-    }
-
-    public function testDefaults() : void
-    {
-        $defaults = [
-            'array' =>  ArrayLoader::class,
-            'xml' =>  XmlFileLoader::class,
-            'yaml' => YamlFileLoader::class,
-            'yml' => YamlFileLoader::class,
-            'php' => PhpFileLoader::class,
-            'json' => JsonFileLoader::class,
-        ];
-
-        foreach ($defaults as $name => $class) {
-            self::assertInstanceOf($class, $this->loader->getLoader($name));
-        }
-    }
-}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/ArrayLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Loader/ArrayLoaderTest.php
deleted file mode 100644
index 047c2fca02..0000000000
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/ArrayLoaderTest.php
+++ /dev/null
@@ -1,37 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Exception\InvalidConfigurationKey;
-use Doctrine\Migrations\Configuration\Exception\UnableToLoadResource;
-use Doctrine\Migrations\Configuration\Loader\ArrayLoader;
-use PHPUnit\Framework\TestCase;
-
-class ArrayLoaderTest extends TestCase
-{
-    public function testNotSupportedData() : void
-    {
-        $this->expectException(UnableToLoadResource::class);
-        $this->expectExceptionMessage('The provided resource can not be loaded by the loader "Doctrine\Migrations\Configuration\Loader\ArrayLoader".');
-        $loader = new ArrayLoader();
-        $loader->load(null);
-    }
-
-    public function testInvalidKey() : void
-    {
-        $this->expectException(InvalidConfigurationKey::class);
-        $this->expectExceptionMessage('Migrations configuration key "foo" does not exist');
-        $loader = new ArrayLoader();
-        $loader->load(['foo' => 'aaa']);
-    }
-
-    public function testInvalidKeyInteger() : void
-    {
-        $this->expectException(InvalidConfigurationKey::class);
-        $this->expectExceptionMessage('Migrations configuration key "0" does not exist.');
-        $loader = new ArrayLoader();
-        $loader->load(['aaa']);
-    }
-}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/JsonLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Loader/JsonLoaderTest.php
deleted file mode 100644
index 323fe49ef0..0000000000
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/JsonLoaderTest.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\JsonNotValid;
-use Doctrine\Migrations\Configuration\Loader\JsonFileLoader;
-
-class JsonLoaderTest extends AbstractLoaderTest
-{
-    public function load(string $prefix = '') : Configuration
-    {
-        $loader = new JsonFileLoader();
-
-        return $loader->load(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.json');
-    }
-
-    public function testMalformed() : void
-    {
-        $this->expectException(JsonNotValid::class);
-        $this->load('malformed');
-    }
-}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/XmlLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Loader/XmlLoaderTest.php
deleted file mode 100644
index 4be6592830..0000000000
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/XmlLoaderTest.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\XmlNotValid;
-use Doctrine\Migrations\Configuration\Loader\XmlFileLoader;
-
-class XmlLoaderTest extends AbstractLoaderTest
-{
-    public function load(string $prefix = '') : Configuration
-    {
-        $loader = new XmlFileLoader();
-
-        return $loader->load(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.xml');
-    }
-
-    public function testConfigurationWithInvalidOption() : void
-    {
-        $this->expectException(XmlNotValid::class);
-
-        $this->load('invalid');
-    }
-
-    public function testMalformed() : void
-    {
-        $this->expectException(XmlNotValid::class);
-
-        $this->load('malformed');
-    }
-}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/Loader/YamlLoaderTest.php b/tests/Doctrine/Migrations/Tests/Configuration/Loader/YamlLoaderTest.php
deleted file mode 100644
index 4c8548a100..0000000000
--- a/tests/Doctrine/Migrations/Tests/Configuration/Loader/YamlLoaderTest.php
+++ /dev/null
@@ -1,26 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Doctrine\Migrations\Tests\Configuration\Loader;
-
-use Doctrine\Migrations\Configuration\Configuration;
-use Doctrine\Migrations\Configuration\Exception\YamlNotValid;
-use Doctrine\Migrations\Configuration\Loader\YamlFileLoader;
-
-class YamlLoaderTest extends AbstractLoaderTest
-{
-    public function load(string $prefix = '') : Configuration
-    {
-        $loader = new YamlFileLoader();
-
-        return $loader->load(__DIR__ . '/../_files/config' . ($prefix!==''? ('_' . $prefix) : '') . '.yml');
-    }
-
-    public function testMalformed() : void
-    {
-        $this->expectException(YamlNotValid::class);
-
-        $this->load('malformed');
-    }
-}
diff --git a/tests/Doctrine/Migrations/Tests/Configuration/_files_loader/migrations.php b/tests/Doctrine/Migrations/Tests/Configuration/_files_loader/migrations.php
new file mode 100644
index 0000000000..b3558dbd1f
--- /dev/null
+++ b/tests/Doctrine/Migrations/Tests/Configuration/_files_loader/migrations.php
@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'name'                      => 'Doctrine Sandbox Migrations FilesLoader',
+    'migrations_paths'      => ['DoctrineMigrationsTest' => '.'],
+
+];