[Form] fix BC layer for form type guessers

Author: xabbuh

Extension/DependencyInjection/DependencyInjectionExtension.php

@@ -42,6 +42,7 @@ public function __construct(ContainerInterface $typeContainer, array $typeExtens
             $this->guesserServiceIds = $guesserServiceIds;
             $this->typeServiceIds = $typeExtensionServices;
             $typeExtensionServices = $guesserServices;
+            $guesserServices = $guesserServiceIds;
         }
 
         $this->typeContainer = $typeContainer;

Tests/Extension/DependencyInjection/DependencyInjectionExtensionTest.php

@@ -14,6 +14,8 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\DependencyInjection\Exception\ServiceNotFoundException;
 use Symfony\Component\Form\Extension\DependencyInjection\DependencyInjectionExtension;
+use Symfony\Component\Form\FormTypeGuesserChain;
+use Symfony\Component\Form\FormTypeGuesserInterface;
 
 class DependencyInjectionExtensionTest extends TestCase
 {
@@ -107,6 +109,49 @@ public function testLegacyThrowExceptionForInvalidExtendedType()
         $extension->getTypeExtensions('test');
     }
 
+    public function testGetTypeGuesser()
+    {
+        $container = $this->createContainerMock();
+        $extension = new DependencyInjectionExtension($container, array(), array($this->getMockBuilder(FormTypeGuesserInterface::class)->getMock()));
+
+        $this->assertInstanceOf(FormTypeGuesserChain::class, $extension->getTypeGuesser());
+    }
+
+    public function testGetTypeGuesserReturnsNullWhenNoTypeGuessersHaveBeenConfigured()
+    {
+        $container = $this->createContainerMock();
+        $extension = new DependencyInjectionExtension($container, array(), array());
+
+        $this->assertNull($extension->getTypeGuesser());
+    }
+
+    /**
+     * @group legacy
+     */
+    public function testLegacyGetTypeGuesser()
+    {
+        $container = $this->createContainerMock();
+        $container
+            ->expects($this->once())
+            ->method('get')
+            ->with('foo')
+            ->willReturn($this->getMockBuilder(FormTypeGuesserInterface::class)->getMock());
+        $extension = new DependencyInjectionExtension($container, array(), array(), array('foo'));
+
+        $this->assertInstanceOf(FormTypeGuesserChain::class, $extension->getTypeGuesser());
+    }
+
+    /**
+     * @group legacy
+     */
+    public function testLegacyGetTypeGuesserReturnsNullWhenNoTypeGuessersHaveBeenConfigured()
+    {
+        $container = $this->createContainerMock();
+        $extension = new DependencyInjectionExtension($container, array(), array(), array());
+
+        $this->assertNull($extension->getTypeGuesser());
+    }
+
     private function createContainerMock()
     {
         return $this->getMockBuilder('Psr\Container\ContainerInterface')