Rename tests/classes to tests/unit

This directory is for unit tests only, so let's rename it to unit to be
more clear.

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

tests/unit/Controllers/JavaScriptMessagesControllerTest.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpMyAdmin\Tests\Controllers;
+
+use Fig\Http\Message\StatusCodeInterface;
+use PhpMyAdmin\Controllers\JavaScriptMessagesController;
+use PhpMyAdmin\Http\Factory\ResponseFactory;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\RunInSeparateProcess;
+use PHPUnit\Framework\TestCase;
+
+use function json_decode;
+use function strlen;
+use function substr;
+
+#[CoversClass(JavaScriptMessagesController::class)]
+class JavaScriptMessagesControllerTest extends TestCase
+{
+    #[RunInSeparateProcess]
+    public function testIndex(): void
+    {
+        $response = (new JavaScriptMessagesController(ResponseFactory::create()))();
+        $actual = (string) $response->getBody();
+        self::assertSame(StatusCodeInterface::STATUS_OK, $response->getStatusCode());
+
+        self::assertStringStartsWith('window.Messages = {', $actual);
+        self::assertStringEndsWith('};', $actual);
+
+        $json = substr($actual, strlen('window.Messages = '), -1);
+        $array = json_decode($json, true);
+
+        self::assertIsArray($array);
+        self::assertArrayHasKey('strDoYouReally', $array);
+        self::assertSame('Do you really want to execute "%s"?', $array['strDoYouReally']);
+    }
+}