Include vendor directory

vendor/maennchen/zipstream-php/test/DataDescriptorTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZipStream\Test;
+
+use PHPUnit\Framework\TestCase;
+use ZipStream\DataDescriptor;
+
+class DataDescriptorTest extends TestCase
+{
+    public function testSerializesCorrectly(): void
+    {
+        $this->assertSame(
+            bin2hex(DataDescriptor::generate(
+                crc32UncompressedData: 0x11111111,
+                compressedSize: 0x77777777,
+                uncompressedSize: 0x99999999,
+            )),
+            '504b0708' . // 4 bytes; Optional data descriptor signature = 0x08074b50
+            '11111111' . // 4 bytes; CRC-32 of uncompressed data
+            '77777777' . // 4 bytes; Compressed size
+            '99999999' // 4 bytes; Uncompressed size
+        );
+    }
+}