Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

tests/Helper/CryptoProxyTest.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Tests\Helper;
+
+use App\Helper\CryptoProxy;
+use Monolog\Handler\TestHandler;
+use Monolog\Logger;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\NullLogger;
+
+class CryptoProxyTest extends TestCase
+{
+    public function testCrypto()
+    {
+        $logHandler = new TestHandler();
+        $logger = new Logger('test', [$logHandler]);
+
+        $crypto = new CryptoProxy(sys_get_temp_dir() . '/' . uniqid('', true) . '.txt', $logger);
+        $crypted = $crypto->crypt('test');
+        $decrypted = $crypto->decrypt($crypted);
+
+        $this->assertSame('test', $decrypted);
+
+        $records = $logHandler->getRecords();
+        $this->assertCount(2, $records);
+        $this->assertStringContainsString('Crypto: crypting value', $records[0]['message']);
+        $this->assertStringContainsString('Crypto: decrypting value', $records[1]['message']);
+    }
+
+    public function testDecryptBadValue()
+    {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Decrypt fail');
+
+        $crypto = new CryptoProxy(sys_get_temp_dir() . '/' . uniqid('', true) . '.txt', new NullLogger());
+        $crypto->decrypt('badvalue');
+    }
+}