Exceptions: Added HttpNotFound exception

src/Http/Exceptions/HttpNotFound.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Engelsystem\Http\Exceptions;
+
+use Throwable;
+
+class HttpNotFound extends HttpException
+{
+    /**
+     * @param string         $message
+     * @param array          $headers
+     * @param int            $code
+     * @param Throwable|null $previous
+     */
+    public function __construct(
+        string $message = '',
+        array $headers = [],
+        int $code = 0,
+        Throwable $previous = null
+    ) {
+        parent::__construct(404, $message, $headers, $code, $previous);
+    }
+}

tests/Unit/Http/Exceptions/HttpNotFoundTest.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Http\Exceptions;
+
+use Engelsystem\Http\Exceptions\HttpNotFound;
+use PHPUnit\Framework\TestCase;
+
+class HttpNotFoundTest extends TestCase
+{
+    /**
+     * @covers \Engelsystem\Http\Exceptions\HttpNotFound::__construct
+     */
+    public function testConstruct()
+    {
+        $exception = new HttpNotFound();
+        $this->assertEquals(404, $exception->getStatusCode());
+        $this->assertEquals('', $exception->getMessage());
+
+        $exception = new HttpNotFound('Nothing to see here!');
+        $this->assertEquals('Nothing to see here!', $exception->getMessage());
+    }
+}