Improve coverage

src/FilesystemPath.php

@@ -16,6 +16,9 @@ abstract class FilesystemPath extends AbstractAbsolutePath
         throw new \LogicException('The class is not meant to be extended externally');
     }
 
+    /**
+     * @codeCoverageIgnore OS specific
+     */
     public static function parse(string $path, bool $strict = false): self
     {
         if (DIRECTORY_SEPARATOR === '\\') {

src/RelativePath.php

@@ -25,6 +25,9 @@ final class RelativePath extends AbstractPath implements RelativePathInterface
         return new self($path, true);
     }
 
+    /**
+     * @codeCoverageIgnore OS specific
+     */
     public static function currentOS(string $path): self
     {
         return new self($path, DIRECTORY_SEPARATOR === '\\');

tests/FilesystemPathTest.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Arokettu\Path\Tests;
+
+use Arokettu\Path\FilesystemPath;
+use PHPUnit\Framework\TestCase;
+
+class FilesystemPathTest extends TestCase
+{
+    public function testDoNotAllowExtending(): void
+    {
+        $this->expectException(\LogicException::class);
+        $this->expectExceptionMessage('The class is not meant to be extended externally');
+
+        new class ('') extends FilesystemPath {
+            protected function parsePath(string $path, bool $strict): void
+            {
+                // whatever
+            }
+        };
+    }
+}