add a default factory

src/Factory/InvokableFactory.php

@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the Tiny package.
+ *
+ * (c) Alex Ermashev <alexermashevn@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Tiny\ServiceManager\Factory;
+
+use Tiny\ServiceManager\ServiceManager;
+
+class InvokableFactory
+{
+
+    /**
+     * @param  ServiceManager  $serviceManager
+     * @param  string          $targetClass
+     *
+     * @return object
+     */
+    public function __invoke(
+        ServiceManager $serviceManager,
+        string $targetClass
+    ) {
+        return new $targetClass();
+    }
+
+}

test/Factory/invokableFactoryTest.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the Tiny package.
+ *
+ * (c) Alex Ermashev <alexermashevn@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace TinyTest\ServiceManager\Factory;
+
+use PHPUnit\Framework\TestCase;
+use Tiny\ServiceManager\Factory\InvokableFactory;
+use Tiny\ServiceManager\ServiceManager;
+use stdClass;
+
+class invokableFactoryTest extends TestCase
+{
+
+    public function testInvokeMethod()
+    {
+        $factory = new InvokableFactory();
+        $instance = $factory(
+            $this->createMock(ServiceManager::class),
+            stdClass::class
+        );
+
+        $this->assertInstanceOf(stdClass::class, $instance);
+    }
+
+}