Add a test for PHP 8.0+ union-types argument type hints

Author: e1himself

specs/Fixtures/MyUnionTypeDependencyService.php

@@ -0,0 +1,18 @@
+<?php /** @noinspection PhpLanguageLevelInspection */
+
+namespace Technically\DependencyResolver\Specs\Fixtures;
+
+use Psr\Container\ContainerInterface;
+
+final class MyUnionTypeDependencyService
+{
+    /**
+     * @var callable|ContainerInterface|string
+     */
+    public $input;
+
+    public function __construct(string|callable|ContainerInterface $input)
+    {
+        $this->input = $input;
+    }
+}

specs/dependency-resolver.spec.php

@@ -10,6 +10,7 @@
 use Technically\DependencyResolver\Specs\Fixtures\MyAbstractContainerService;
 use Technically\DependencyResolver\Specs\Fixtures\MyNullableArgumentService;
 use Technically\DependencyResolver\Specs\Fixtures\MyOptionalArgumentService;
+use Technically\DependencyResolver\Specs\Fixtures\MyUnionTypeDependencyService;
 use Technically\DependencyResolver\Specs\Fixtures\MyUnresolvableScalarArgumentService;
 use Technically\DependencyResolver\Specs\Fixtures\MyUntypedArgumentService;
 
@@ -43,6 +44,19 @@
         assert($resolved->container === $container);
     });
 
+    if (PHP_MAJOR_VERSION >= 8) {
+        it('should instantiate a class resolving union type dependencies', function () {
+            $container = new ArrayContainer();
+            $container->set(ContainerInterface::class, $container);
+            $resolver = new DependencyResolver($container);
+
+            $resolved = $resolver->resolve(MyUnionTypeDependencyService::class);
+
+            assert($resolved instanceof MyUnionTypeDependencyService);
+            assert($resolved->input === $container);
+        });
+    }
+
     it('should instantiate a class creating required dependencies recursively', function () {
         $container = new ArrayContainer();
         $resolver = new DependencyResolver($container);

src/DependencyResolver.php

@@ -169,7 +169,7 @@ private function getParameterTypes(ReflectionParameter $parameter, ?string $clas
 
         /** @noinspection PhpElementIsNotAvailableInCurrentPhpVersionInspection */
         if (class_exists(\ReflectionUnionType::class) && $type instanceof \ReflectionUnionType) {
-             array_map(
+             return array_map(
                 function (ReflectionNamedType $type) use ($className): Type {
                     return new Type($type->getName(), $className);
                 },