[Downgrade][Php81][Php80] Handle nullable downgrade initialization on use DowngradeNewInInitializerRector+DowngradePropertyPromotionRector

Author: samsonasik

tests/Issues/DowngradeNullableInitialization/DowngradeNullableInitializationTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Issues\DowngradeNullableInitialization;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class DowngradeNullableInitializationTest extends AbstractRectorTestCase
+{
+    #[DataProvider('provideData')]
+    public function test(string $filePath): void
+    {
+        $this->doTestFile($filePath);
+    }
+
+    public static function provideData(): Iterator
+    {
+        return self::yieldFilesFromDirectory(__DIR__ . '/Fixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/configured_rule.php';
+    }
+}

tests/Issues/DowngradeNullableInitialization/Fixture/add_nullable_initialization.php.inc

@@ -0,0 +1,32 @@
+<?php
+
+namespace Rector\Tests\Issues\DowngradeNullableInitialization\Fixture;
+
+final class AddNullableInitializtion
+{
+    public function __construct(
+        private array $doctrineTypeToScalarType = [
+            'tinyint' => new \PHPStan\Type\BooleanType(),
+        ]
+     ) {}
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Issues\DowngradeNullableInitialization\Fixture;
+
+final class AddNullableInitializtion
+{
+    private array $doctrineTypeToScalarType;
+    public function __construct(?array $doctrineTypeToScalarType = null)
+    {
+        $doctrineTypeToScalarType ??= [
+            'tinyint' => new \PHPStan\Type\BooleanType(),
+        ];
+        $this->doctrineTypeToScalarType = $doctrineTypeToScalarType;
+    }
+}
+
+?>

tests/Issues/DowngradeNullableInitialization/config/configured_rule.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+use Rector\DowngradePhp81\Rector\FunctionLike\DowngradeNewInInitializerRector;
+use Rector\DowngradePhp80\Rector\Class_\DowngradePropertyPromotionRector;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->rules([
+        DowngradeNewInInitializerRector::class,
+        DowngradePropertyPromotionRector::class,
+    ]);
+};