--- /dev/null
+<?php
+
+namespace Drupal\Tests\drupalmoduleupgrader\Unit\Plugin\DMU\Fixer;
+
+use Drupal\Component\Serialization\Yaml as YAML;
+use Drupal\drupalmoduleupgrader\Plugin\DMU\Fixer\HookToYAML;
+use Drupal\Tests\drupalmoduleupgrader\Unit\TestBase;
+
+/**
+ * @group DMU.Fixer
+ */
+class HookToYAMLTest extends TestBase {
+
+ public function test() {
+ $permissions = [
+ 'bazify' => [
+ 'title' => 'Do snazzy bazzy things',
+ ],
+ ];
+
+ $indexer = $this->getMockBuilder('\Drupal\drupalmoduleupgrader\Plugin\DMU\Indexer\Functions')
+ ->disableOriginalConstructor()
+ ->getMock();
+ $indexer->method('has')->with('hook_permission')->willReturn(TRUE);
+ $indexer->method('hasExecutable')->with('hook_permission')->willReturn(TRUE);
+ $indexer->method('execute')->with('hook_permission')->willReturn($permissions);
+ $this
+ ->container
+ ->get('plugin.manager.drupalmoduleupgrader.indexer')
+ ->method('createInstance')
+ ->with('function')
+ ->willReturn($indexer);
+
+ $config = [
+ 'hook' => 'permission',
+ 'destination' => '~/foo.permissions.yml',
+ ];
+ $plugin = new HookToYAML($config, uniqID(), []);
+ $plugin->setTarget($this->target);
+ $plugin->execute();
+
+ $url = $this->dir->getChild('foo.permissions.yml')->url();
+ $this->assertFileExists($url);
+ $this->assertSame(YAML::encode($permissions), file_get_contents($url));
+ }
+
+}