not used to plugin testing - trying to get working but fixtures not working yet

tests/test_app/src/Application.php

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+<?php
+
+namespace TestApp;
+
+use Cake\Http\BaseApplication;
+use Cake\Http\MiddlewareQueue;
+use Cake\Routing\Middleware\RoutingMiddleware;
+
+class Application extends BaseApplication {
+
+	/**
+	 * @inheritDoc
+	 */
+	public function middleware(MiddlewareQueue $middleware): MiddlewareQueue {
+		$middleware->add(new RoutingMiddleware($this));
+
+		return $middleware;
+	}
+
+}

tests/test_app/src/Controller/AppController.php

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+<?php
+
+namespace TestApp\Controller;
+
+use Cake\Controller\Controller;
+
+class AppController extends Controller {
+}

tests/test_app/src/View/AppView.php

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+<?php
+
+namespace TestApp\View;
+
+use Cake\View\View;
+
+/**
+ * @property \TinyAuth\View\Helper\AuthUserHelper $AuthUser
+ */
+class AppView extends View {
+}

tests/test_app/templates/Error/error500.php

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+<?php
+
+use Cake\Core\Configure;
+use Cake\Error\Debugger;
+
+$this->layout = 'error';
+
+if (Configure::read('debug')):
+	$this->layout = 'dev_error';
+
+	$this->assign('title', $message);
+	$this->assign('templateName', 'error500.ctp');
+
+	$this->start('file');
+?>
+<?php if (!empty($error->queryString)) : ?>
+    <p class="notice">
+        <strong>SQL Query: </strong>
+        <?= h($error->queryString) ?>
+    </p>
+<?php endif; ?>
+<?php if (!empty($error->params)) : ?>
+        <strong>SQL Query Params: </strong>
+        <?php Debugger::dump($error->params) ?>
+<?php endif; ?>
+<?php if ($error instanceof Error) : ?>
+        <strong>Error in: </strong>
+        <?= sprintf('%s, line %s', str_replace(ROOT, 'ROOT', $error->getFile()), $error->getLine()) ?>
+<?php endif; ?>
+<?php
+	echo $this->element('auto_table_warning');
+
+	if (extension_loaded('xdebug')):
+		xdebug_print_function_stack();
+	endif;
+
+	$this->end();
+endif;
+?>
+<h2><?= __d('cake', 'An Internal Error Has Occurred') ?></h2>
+<p class="error">
+    <strong><?= __d('cake', 'Error') ?>: </strong>
+    <?= h($message) ?>
+</p>

tests/test_app/templates/layout/ajax.php

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+<?php
+/**
+ * @var \App\View\AppView $this
+ */
+?>
+<?= $this->fetch('content') ?>

tests/test_app/templates/layout/default.php

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+<?php
+/**
+ * @var \App\View\AppView $this
+ */
+?>
+<?= $this->fetch('content') ?>