Add test for getting the correct Sort order from MMTL items, fix incorrect test class name

tests/GridFieldOrderableRowsTest.php

@@ -88,6 +88,40 @@ class GridFieldOrderableRowsTest extends SapphireTest
         $this->assertEquals($desiredOrder, $newOrder);
     }
 
+    public function testManyManyThroughListSortOrdersAreUsedForInitialRender()
+    {
+        /** @var ThroughDefiner $record */
+        $record = $this->objFromFixture(ThroughDefiner::class, 'DefinerOne');
+
+        $orderable = new GridFieldOrderableRows('Sort');
+        $config = new GridFieldConfig_RelationEditor();
+        $config->addComponent($orderable);
+
+        $grid = new GridField(
+            'Belongings',
+            'Testing Many Many',
+            $record->Belongings()->sort('Sort'),
+            $config
+        );
+
+        // Get the first record, which would be the first one to have column contents generated
+        /** @var ThroughIntermediary $expected */
+        $intermediary = $this->objFromFixture(ThroughIntermediary::class, 'One');
+
+        $result = $orderable->getColumnContent($grid, $record, 'irrelevant');
+
+        $this->assertContains(
+            'Belongings[GridFieldEditableColumns][' . $record->ID . '][Sort]',
+            $result,
+            'The field name is indexed under the record\'s ID'
+        );
+        $this->assertContains(
+            'value="' . $intermediary->Sort . '"',
+            $result,
+            'The value comes from the MMTL intermediary Sort value'
+        );
+    }
+
     public function testSortableChildClass()
     {
         $orderable = new GridFieldOrderableRows('Sort');

tests/OrderableRowsThroughVersionedTest.php

@@ -12,7 +12,7 @@ use Symbiote\GridFieldExtensions\Tests\Stub\ThroughIntermediary;
 use Symbiote\GridFieldExtensions\Tests\Stub\ThroughBelongs;
 use Symbiote\GridFieldExtensions\GridFieldOrderableRows;
 
-class OrderableRowsThroughTest extends SapphireTest
+class OrderableRowsThroughVersionedTest extends SapphireTest
 {
     protected static $fixture_file = 'OrderableRowsThroughTest.yml';
 
@@ -105,7 +105,7 @@ class OrderableRowsThroughTest extends SapphireTest
             }
         }
         $this->assertTrue($differenceFound, 'All records should have changes in draft');
-        
+
         // Verify live stage has NOT reordered
         Versioned::set_stage(Versioned::LIVE);
         $sameOrder = $parent->$relationName()->sort($sortName)->column('ID');

tests/Stub/ThroughIntermediary.php

@@ -2,18 +2,17 @@
 
 namespace Symbiote\GridFieldExtensions\Tests\Stub;
 
-use SilverStripe\ORM\DataObject;
-use SilverStripe\ORM\FieldType\DBInt;
 use SilverStripe\Dev\TestOnly;
+use SilverStripe\ORM\DataObject;
 
 class ThroughIntermediary extends DataObject implements TestOnly
 {
     private static $table_name = 'IntermediaryThrough';
 
     private static $db = [
-        'Sort' => DBInt::class,
+        'Sort' => 'Int',
     ];
-    
+
     private static $has_one = [
         'Defining' => ThroughDefiner::class,
         'Belonging' => ThroughBelongs::class,