add a test for the compress.zlib://vfs:// functionality

The canOpenTwoCompressZlibUrlsAtTheSameTime() test currently fails,
it seems it is not compatible with fopen(). This needs to be
investigated while file_get|put_contents() works but not fopen().

src/test/php/org/bovigo/vfs/StreamCastTestCase.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * This file is part of vfsStream.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @package  org\bovigo\vfs
+ */
+namespace org\bovigo\vfs;
+/**
+ * Test for stream_cast, e.g. compress.zlib://vfs://root/test.nbt.
+ *
+ * @group  issue_125
+ */
+class StreamCastTestCase extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @type  \org\bovigo\vfs\vfsStreamDirectory
+     */
+    private $root;
+
+    /**
+     * set up test environment
+     */
+    public function setUp()
+    {
+        $this->root = vfsStream::setup('root');
+    }
+
+    /**
+     * @test
+     */
+    public function canUseCompressZlibInConjunctionWithVfsUrl()
+    {
+        file_put_contents('compress.zlib://vfs://root/test.nbt', 'barbaz');
+        $this->assertEquals(
+                'barbaz',
+                file_get_contents('compress.zlib://vfs://root/test.nbt')
+        );
+    }
+
+    /**
+     * @test
+     */
+    public function canOpenTwoCompressZlibUrlsAtTheSameTime()
+    {
+        $file1 = fopen('compress.zlib://vfs://root/test.nbt', 'wb+');
+        $file2 = fopen('compress.zlib://vfs://root/other.nbt', 'wb+');
+        fwrite($file2, 'Yippie ki-yay');
+        fwrite($file1, 'barbaz');
+        fclose($file2);
+        fclose($file1);
+        $this->assertEquals(
+                'barbaz',
+                file_get_contents('compress.zlib://vfs://root/test.nbt')
+        );
+        $this->assertEquals(
+                'Yippie ki-yay',
+                file_get_contents('compress.zlib://vfs://root/other.nbt')
+        );
+
+    }
+}