Register github repository type

src/Composer/Repository/RepositoryFactory.php

@@ -119,6 +119,7 @@ class RepositoryFactory
         $rm->setRepositoryClass('package', 'Composer\Repository\PackageRepository');
         $rm->setRepositoryClass('pear', 'Composer\Repository\PearRepository');
         $rm->setRepositoryClass('git', 'Composer\Repository\VcsRepository');
+        $rm->setRepositoryClass('github', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('gitlab', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('svn', 'Composer\Repository\VcsRepository');
         $rm->setRepositoryClass('fossil', 'Composer\Repository\VcsRepository');

tests/Composer/Test/Repository/RepositoryFactoryTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Test\Repository;
+
+use Composer\Repository\RepositoryFactory;
+use Composer\TestCase;
+
+class RepositoryFactoryTest extends TestCase
+{
+    public function testManagerWithAllRepositoryTypes()
+    {
+        $manager = RepositoryFactory::manager(
+            $this->getMock('Composer\IO\IOInterface'),
+            $this->getMock('Composer\Config')
+        );
+
+        $ref = new \ReflectionProperty($manager, 'repositoryClasses');
+        $ref->setAccessible(true);
+        $repositoryClasses = $ref->getValue($manager);
+
+        $this->assertEquals([
+            'composer',
+            'vcs',
+            'package',
+            'pear',
+            'git',
+            'github',
+            'gitlab',
+            'svn',
+            'fossil',
+            'perforce',
+            'hg',
+            'artifact',
+            'path',
+        ], array_keys($repositoryClasses));
+    }
+}