Fix

Author: reimic

src/WordPress/Zip/ZipFileEntry.php

@@ -76,7 +76,7 @@ public function __construct(
 		$this->compressionMethod = $compressionMethod;
 		$this->generalPurpose    = $generalPurpose;
 		$this->version           = $version;
-		$this->isDirectory       = $this->path[- 1] === '/';
+		$this->isDirectory       = substr( $this->path, -1 ) === '/';
 	}
 
 	public function isFileEntry() {

tests/unit/zip/ZipFunctionsTest.php

@@ -9,7 +9,7 @@
 use function WordPress\Zip\zip_extract_to;
 
 class ZipFunctionsTest extends PHPUnitTestCase {
-	public function testImmuneToZipSlip() {
+	public function testIsImmuneToZipSlipVulnerability() {
 		$filesystem = new Filesystem();
 
 		$filename = __DIR__ . 'tmp/zip-slip-test.zip';