Moved migration helpers into their own namespace

Technically an API breakage, but I don't see migration helpers as part of our API surface.
They're one off utilities

src/FileMigrationHelper.php → src/Migration/FileMigrationHelper.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace SilverStripe\Assets;
+namespace SilverStripe\Assets\Migration;
 
 use SilverStripe\Assets\Flysystem\FlysystemAssetStore;
 use SilverStripe\Assets\Storage\AssetStore;

src/LegacyThumbnailMigrationHelper.php → src/Migration/LegacyThumbnailMigrationHelper.php

@@ -1,11 +1,13 @@
 <?php
 
-namespace SilverStripe\Assets;
+namespace SilverStripe\Assets\Migration;
 
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
+use SilverStripe\Assets\File;
 use SilverStripe\Assets\FilenameParsing\LegacyFileIDHelper;
 use SilverStripe\Assets\Flysystem\FlysystemAssetStore;
+use SilverStripe\Assets\Folder;
 use SilverStripe\Core\Config\Configurable;
 use SilverStripe\Core\Environment;
 use SilverStripe\Core\Injector\Injectable;

tests/php/FileMigrationHelperTest.php → tests/php/Migration/FileMigrationHelperTest.php

@@ -1,17 +1,15 @@
 <?php
 
-namespace SilverStripe\Assets\Tests;
+namespace SilverStripe\Assets\Tests\Migration;
 
 use Silverstripe\Assets\Dev\TestAssetStore;
 use SilverStripe\Assets\File;
-use SilverStripe\Assets\FileMigrationHelper;
+use SilverStripe\Assets\Migration\FileMigrationHelper;
 use SilverStripe\Assets\Filesystem;
 use SilverStripe\Assets\Flysystem\FlysystemAssetStore;
 use SilverStripe\Assets\Folder;
-use SilverStripe\Assets\Image;
 use SilverStripe\Assets\Tests\FileMigrationHelperTest\Extension;
 use SilverStripe\Core\Config\Config;
-use SilverStripe\Core\Convert;
 use SilverStripe\Dev\SapphireTest;
 
 /**
@@ -49,7 +47,7 @@ public function setUp()
         TestAssetStore::activate('FileMigrationHelperTest/assets');
 
         // Ensure that each file has a local record file in this new assets base
-        $from = __DIR__ . '/ImageTest/test-image-low-quality.jpg';
+        $from = __DIR__ . '/../ImageTest/test-image-low-quality.jpg';
         foreach (File::get()->exclude('ClassName', Folder::class) as $file) {
             $dest = TestAssetStore::base_path() . '/' . $file->generateFilename();
             Filesystem::makeFolder(dirname($dest));

tests/php/LegacyThumbnailMigrationHelperTest.php → tests/php/Migration/LegacyThumbnailMigrationHelperTest.php

@@ -1,19 +1,16 @@
 <?php
 
-namespace SilverStripe\Assets\Tests;
+namespace SilverStripe\Assets\Tests\Migration;
 
 use Silverstripe\Assets\Dev\TestAssetStore;
 use SilverStripe\Assets\File;
-use SilverStripe\Assets\FileMigrationHelper;
 use SilverStripe\Assets\FilenameParsing\ParsedFileID;
 use SilverStripe\Assets\Filesystem;
-use SilverStripe\Assets\Flysystem\FlysystemAssetStore;
 use SilverStripe\Assets\Folder;
 use SilverStripe\Assets\Image;
-use SilverStripe\Assets\LegacyThumbnailMigrationHelper;
+use SilverStripe\Assets\Migration\LegacyThumbnailMigrationHelper;
 use SilverStripe\Assets\Storage\AssetStore;
 use SilverStripe\Assets\Tests\FileMigrationHelperTest\Extension;
-use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Convert;
 use SilverStripe\Dev\SapphireTest;
 
@@ -49,7 +46,7 @@ public function setUp()
         TestAssetStore::activate('LegacyThumbnailMigrationHelperTest/assets');
 
         // Ensure that each file has a local record file in this new assets base
-        $from = $this->joinPaths(__DIR__, 'ImageTest/test-image-low-quality.jpg');
+        $from = $this->joinPaths(__DIR__, '..', 'ImageTest/test-image-low-quality.jpg');
         foreach (File::get()->exclude('ClassName', Folder::class) as $file) {
             /** @var $file File */
             $file->setFromLocalFile($from, $file->generateFilename());