Tests for nullable Multiplier

Author: ondrejmirtes

tests/Type/Nette/MultiplierTest.php

@@ -2,14 +2,30 @@
 
 namespace PHPStan\Type\Nette;
 
+use Composer\InstalledVersions;
+use OutOfBoundsException;
 use PHPStan\Testing\TypeInferenceTestCase;
+use function class_exists;
+use function version_compare;
 
 class MultiplierTest extends TypeInferenceTestCase
 {
 
 	public function dataFileAsserts(): iterable
 	{
-		yield from self::gatherAssertTypes(__DIR__ . '/data/multiplier.php');
+		try {
+			$applicationVersion = class_exists(InstalledVersions::class)
+				? InstalledVersions::getVersion('nette/application')
+				: null;
+		} catch (OutOfBoundsException $e) {
+			$applicationVersion = null;
+		}
+
+		if ($applicationVersion !== null && version_compare($applicationVersion, '3.2.5', '>=')) {
+			yield from self::gatherAssertTypes(__DIR__ . '/data/multiplierApplication325.php');
+		} else {
+			yield from self::gatherAssertTypes(__DIR__ . '/data/multiplier.php');
+		}
 	}
 
 	/**

tests/Type/Nette/data/multiplierApplication325.php

@@ -0,0 +1,21 @@
+<?php declare(strict_types = 1);
+
+use Nette\Application\UI\Form;
+use Nette\Application\UI\Multiplier;
+
+use function PHPStan\Testing\assertType;
+
+/** @var Multiplier<Form|null> $multiplier */
+$multiplier = new Multiplier(function (string $name): ?Form {
+	if($name === 'foo') {
+		return new Form();
+	} else {
+		return null;
+	}
+});
+
+assertType('Nette\Application\UI\Multiplier<Nette\Application\UI\Form|null>', $multiplier);
+
+$form = $multiplier->createComponent('foo');
+
+assertType(Form::class . '|null', $form);