refactor: update test classes to use modern App\Tests namespace

Author: nanoninja

web/app/tests/FooTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Tests;
+
+use App\Foo;
+use PHPUnit\Framework\TestCase;
+
+class FooTest extends TestCase
+{
+    public function testGetName()
+    {
+        $foo = new Foo();
+        $this->assertEquals($foo->getName(), 'Docker Nginx PHP MySQL');
+    }
+}