test: collect the unit tests filinq was never running, and fix the stub gap they hid

tests/stubs/NextcloudStubs.php

@@ -1426,6 +1426,22 @@ public function getAppVersion(string $appId): string;
 	 * @return array<int, string>
 	 */
 	public function getInstalledApps(): array;
+
+	/**
+	 * Absolute path to an app's directory on disk.
+	 *
+	 * Signature mirrors OCP\App\IAppManager::getAppPath(). A stub that omits a
+	 * method the production interface declares does not fail loudly: PHPUnit
+	 * refuses to configure it ("Trying to configure method ... which cannot be
+	 * configured because it does not exist"), so the test errors somewhere far
+	 * from the omission, and reads as a broken test rather than a short stub.
+	 *
+	 * @param string $appId App identifier
+	 * @param bool $ignoreCache Whether to bypass the path cache
+	 *
+	 * @return string
+	 */
+	public function getAppPath(string $appId, bool $ignoreCache = false): string;
 }//end interface
 
 namespace OCP\Notification;

tests/Unit/Controller/SetupControllerTest.php → tests/unit/Controller/SetupControllerTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Unit\Controller;
+namespace OCA\Filinq\Tests\Unit\Controller;
 
 use OCA\Filinq\Controller\SetupController;
 use OCA\Filinq\Service\DemoDataService;

tests/Unit/Service/DemoDataServiceTest.php → tests/unit/Service/DemoDataServiceTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Unit\Service;
+namespace OCA\Filinq\Tests\Unit\Service;
 
 use OCA\Filinq\Service\DemoDataService;
 use OCP\App\IAppManager;