Mock comparator

tests/Tests/OrmTestCase.php

@@ -9,7 +9,10 @@
 use Doctrine\DBAL\Driver\Result;
 use Doctrine\DBAL\Platforms\AbstractPlatform;
 use Doctrine\DBAL\Schema\AbstractSchemaManager;
+use Doctrine\DBAL\Schema\Comparator;
+use Doctrine\DBAL\Schema\Schema;
 use Doctrine\DBAL\Schema\SchemaConfig;
+use Doctrine\DBAL\Schema\SchemaDiff;
 use Doctrine\ORM\Cache\CacheConfiguration;
 use Doctrine\ORM\Cache\CacheFactory;
 use Doctrine\ORM\Cache\DefaultCacheFactory;
@@ -156,6 +159,8 @@ private function createPlatformMock(): AbstractPlatform
         $schemaManager = $this->createMock(AbstractSchemaManager::class);
         $schemaManager->method('createSchemaConfig')
             ->willReturn(new SchemaConfig());
+        $schemaManager->method('createComparator')
+            ->willReturn($this->mockComparator(new SchemaDiff()));
 
         $platform = $this->getMockBuilder(AbstractPlatform::class)
             ->onlyMethods(['supportsIdentityColumns', 'createSchemaManager'])
@@ -168,6 +173,22 @@ private function createPlatformMock(): AbstractPlatform
         return $platform;
     }
 
+    private function mockComparator(SchemaDiff $schemaDiff): Comparator
+    {
+        $comparator = new class (self::createStub(AbstractPlatform::class)) extends Comparator {
+            public static SchemaDiff $schemaDiff;
+
+            public function compareSchemas(Schema $oldSchema, Schema $newSchema): SchemaDiff
+            {
+                return self::$schemaDiff;
+            }
+        };
+
+        $comparator::$schemaDiff = $schemaDiff;
+
+        return $comparator;
+    }
+
     private function createDriverMock(AbstractPlatform $platform): Driver
     {
         $result = $this->createMock(Result::class);