Move Nix files into a nix directory

Move everything from `config` to the root level.

phpactor/phpactor.yml

@@ -0,0 +1,5 @@
+code_transform.class_new.variants:
+  default: default
+  drupal-functional-test: drupal-functional-test
+  drupal-kernel-test: drupal-kernel-test
+  drupal-unit-test: drupal-unit-test

phpactor/templates/default/SourceCode.php.twig

@@ -0,0 +1,10 @@
+<?php
+
+declare(strict_types=1);
+
+namespace {{ prototype.namespace }};
+
+{% for class in prototype.classes %}
+final class {{ class.name }} {
+}
+{% endfor %}

phpactor/templates/drupal-functional-test/SourceCode.php.twig

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace {{ prototype.namespace }};
+
+use Drupal\Tests\BrowserTestBase;
+
+{% for class in prototype.classes %}
+final class {{ class.name }} extends BrowserTestBase {
+
+  public $defaultTheme = 'stark';
+
+  public static $modules = [];
+
+  public function setUp(): void {
+    parent::setUp();
+  }
+
+}
+{% endfor %}

phpactor/templates/drupal-kernel-test/SourceCode.php.twig

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace {{ prototype.namespace }};
+
+use Drupal\KernelTests\KernelTestBase;
+
+{% for class in prototype.classes %}
+final class {{ class.name }} extends KernelTestBase {
+
+  public static $modules = [];
+
+  protected $strictConfigSchema = FALSE;
+
+  public function setUp(): void {
+    parent::setUp();
+  }
+
+}
+{% endfor %}

phpactor/templates/drupal-unit-test/SourceCode.php.twig

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace {{ prototype.namespace }};
+
+use Drupal\Tests\UnitTestCase;
+
+{% for class in prototype.classes %}
+final class {{ class.name }} extends UnitTestCase {
+
+}
+{% endfor %}