Add `symlink` and `is_link` acceptance tests

test/acceptance/Stream/StreamWrapper/SymlinkAcceptanceTest.php

@@ -0,0 +1,41 @@
+<?php
+namespace Vfs\Stream\StreamWrapper;
+
+use Vfs\Test\AcceptanceTestCase;
+
+class SymlinkAcceptanceTest extends AcceptanceTestCase
+{
+    protected $tree = [
+        'foo' => [
+            'bar' => 'baz'
+        ]
+    ];
+
+    public function testIsLink()
+    {
+        $factory = $this->fs->getNodeFactory();
+
+        $file = $this->fs->get('/foo/bar');
+        $this->fs->get('/')->add('symlink', $factory->buildFileLink($file));
+
+        $this->assertTrue(is_link("$this->scheme:///symlink"));
+    }
+
+    public function testDirectoryLink()
+    {
+        $this->markTestSkipped('`symlink()` isn\'t supported by PHP Stream Wrappers');
+
+        symlink("$this->scheme:///foo/bar", "$this->scheme:///symlink");
+
+        $this->assertTrue(is_link("$this->scheme:///symlink"));
+    }
+
+    public function testFileLink()
+    {
+        $this->markTestSkipped('`symlink()` isn\'t supported by PHP Stream Wrappers');
+
+        symlink("$this->scheme:///foo", "$this->scheme:///symlink");
+
+        $this->assertTrue(is_link("$this->scheme:///symlink"));
+    }
+}