first commit

tests/Kernel/FlashServiceCoverageTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Kernel;
+
+use Netig\Netslim\Kernel\Http\Infrastructure\Flash\FlashService;
+use PHPUnit\Framework\TestCase;
+
+#[\PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations]
+final class FlashServiceCoverageTest extends TestCase
+{
+    protected function setUp(): void
+    {
+        $_SESSION = [];
+    }
+
+    public function testGetCastsFalseToEmptyString(): void
+    {
+        $_SESSION['flash']['flag'] = false;
+
+        $flash = new FlashService();
+
+        self::assertSame('', $flash->get('flag'));
+        self::assertArrayNotHasKey('flag', $_SESSION['flash']);
+    }
+}