add test for #1225

tests/Issues/Issue1225/Fixture/fixture1225.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Rector\Tests\Issues\Issue1225\Fixture;
+
+final class SomeController
+{
+    public function view($id = null)
+    {
+        $this->safeTwigEnvironment = new \Twig_Environment(
+            new \Twig_Loader_Array([])
+        );
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Issues\Issue1225\Fixture;
+
+final class SomeController
+{
+    public function view($id = null)
+    {
+        $this->safeTwigEnvironment = new \Twig\Environment(
+            new \Twig\Loader\ArrayLoader([])
+        );
+    }
+}
+
+?>

tests/Issues/Issue1225/Issue1225Test.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace Rector\Tests\Issues\Issue1225;
+
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class Issue1225Test extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture1225.php']);
+    }
+
+    protected function provideConfig(): string
+    {
+        return __DIR__ . '/config/config1225.yaml';
+    }
+}

tests/Issues/Issue1225/config/config1225.yaml

@@ -0,0 +1,3 @@
+imports:
+    # same as "--level underscore-to-namespace"
+    - { resource: "../../../../config/level/twig/underscore-to-namespace.yaml" }