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diff --git a/vendor/mikey179/vfsStream/src/test/php/org/bovigo/vfs/vfsStreamWrapperAlreadyRegisteredTestCase.php b/vendor/mikey179/vfsStream/src/test/php/org/bovigo/vfs/vfsStreamWrapperAlreadyRegisteredTestCase.php
new file mode 100644
index 000000000..ded376ae6
--- /dev/null
+++ b/vendor/mikey179/vfsStream/src/test/php/org/bovigo/vfs/vfsStreamWrapperAlreadyRegisteredTestCase.php
@@ -0,0 +1,62 @@
+<?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;
+/**
+ * Helper class for the test.
+ */
+class TestvfsStreamWrapper extends vfsStreamWrapper
+{
+    /**
+     * unregisters vfsStreamWrapper
+     */
+    public static function unregister()
+    {
+        if (in_array(vfsStream::SCHEME, stream_get_wrappers()) === true) {
+            stream_wrapper_unregister(vfsStream::SCHEME);
+        }
+
+        self::$registered = false;
+    }
+}
+/**
+ * Test for org\bovigo\vfs\vfsStreamWrapper.
+ */
+class vfsStreamWrapperAlreadyRegisteredTestCase extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * set up test environment
+     */
+    public function setUp()
+    {
+        TestvfsStreamWrapper::unregister();
+        $mock = $this->getMock('org\\bovigo\\vfs\\vfsStreamWrapper');
+        stream_wrapper_register(vfsStream::SCHEME, get_class($mock));
+    }
+
+    /**
+     * clean up test environment
+     */
+    public function tearDown()
+    {
+        TestvfsStreamWrapper::unregister();
+    }
+
+    /**
+     * registering the stream wrapper when another stream wrapper is already
+     * registered for the vfs scheme should throw an exception
+     *
+     * @test
+     * @expectedException  org\bovigo\vfs\vfsStreamException
+     */
+    public function registerOverAnotherStreamWrapper()
+    {
+        vfsStreamWrapper::register();
+    }
+}