add test for double assign removal

tests/Issues/KeepDoubleAssignParam/Fixture/fixture.php.inc

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+<?php
+
+namespace Rector\Tests\Issues\KeepDoubleAssignParam\Fixture;
+
+final class Fixture
+{
+    private $items;
+
+    public function __construct($input)
+    {
+        if (! \is_array($input)) {
+            $this->items = [$input];
+        } else {
+            $this->items = $input;
+        }
+
+        $this->items = $this->getItems();
+    }
+
+    public function getItems()
+    {
+        return sort($this->items);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Issues\KeepDoubleAssignParam\Fixture;
+
+final class Fixture
+{
+    private $items;
+
+    public function __construct($input)
+    {
+        $this->items = !\is_array($input) ? [$input] : $input;
+
+        $this->items = $this->getItems();
+    }
+
+    public function getItems()
+    {
+        return sort($this->items);
+    }
+}
+
+?>

tests/Issues/KeepDoubleAssignParam/KeepDoubleAssignParamTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\Issues\KeepDoubleAssignParam;
+
+use Iterator;
+use PHPUnit\Framework\Attributes\DataProvider;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class KeepDoubleAssignParamTest 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/KeepDoubleAssignParam/config/configured_rule.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withRules([
+        \Rector\CodeQuality\Rector\If_\SimplifyIfElseToTernaryRector::class,
+        \Rector\DeadCode\Rector\Assign\RemoveDoubleAssignRector::class,
+        \Rector\DeadCode\Rector\ClassMethod\RemoveUnusedConstructorParamRector::class,
+    ]);