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diff --git a/vendor/sebastian/global-state/src/Restorer.php b/vendor/sebastian/global-state/src/Restorer.php
new file mode 100644
index 000000000..78e0ba805
--- /dev/null
+++ b/vendor/sebastian/global-state/src/Restorer.php
@@ -0,0 +1,141 @@
+<?php
+/*
+ * This file is part of the GlobalState package.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\GlobalState;
+
+use ReflectionProperty;
+
+/**
+ * Restorer of snapshots of global state.
+ */
+class Restorer
+{
+    /**
+     * Deletes function definitions that are not defined in a snapshot.
+     *
+     * @param  Snapshot         $snapshot
+     * @throws RuntimeException when the uopz_delete() function is not available
+     * @see    https://github.com/krakjoe/uopz
+     */
+    public function restoreFunctions(Snapshot $snapshot)
+    {
+        if (!function_exists('uopz_delete')) {
+            throw new RuntimeException('The uopz_delete() function is required for this operation');
+        }
+
+        $functions = get_defined_functions();
+
+        foreach (array_diff($functions['user'], $snapshot->functions()) as $function) {
+            uopz_delete($function);
+        }
+    }
+
+    /**
+     * Restores all global and super-global variables from a snapshot.
+     *
+     * @param Snapshot $snapshot
+     */
+    public function restoreGlobalVariables(Snapshot $snapshot)
+    {
+        $superGlobalArrays = $snapshot->superGlobalArrays();
+
+        foreach ($superGlobalArrays as $superGlobalArray) {
+            $this->restoreSuperGlobalArray($snapshot, $superGlobalArray);
+        }
+
+        $globalVariables = $snapshot->globalVariables();
+
+        foreach (array_keys($GLOBALS) as $key) {
+            if ($key != 'GLOBALS' &&
+                !in_array($key, $superGlobalArrays) &&
+                !$snapshot->blacklist()->isGlobalVariableBlacklisted($key)) {
+                if (isset($globalVariables[$key])) {
+                    $GLOBALS[$key] = $globalVariables[$key];
+                } else {
+                    unset($GLOBALS[$key]);
+                }
+            }
+        }
+    }
+
+    /**
+     * Restores all static attributes in user-defined classes from this snapshot.
+     *
+     * @param Snapshot $snapshot
+     */
+    public function restoreStaticAttributes(Snapshot $snapshot)
+    {
+        $current    = new Snapshot($snapshot->blacklist(), false, false, false, false, true, false, false, false, false);
+        $newClasses = array_diff($current->classes(), $snapshot->classes());
+        unset($current);
+
+        foreach ($snapshot->staticAttributes() as $className => $staticAttributes) {
+            foreach ($staticAttributes as $name => $value) {
+                $reflector = new ReflectionProperty($className, $name);
+                $reflector->setAccessible(true);
+                $reflector->setValue($value);
+            }
+        }
+
+        foreach ($newClasses as $className) {
+            $class    = new \ReflectionClass($className);
+            $defaults = $class->getDefaultProperties();
+
+            foreach ($class->getProperties() as $attribute) {
+                if (!$attribute->isStatic()) {
+                    continue;
+                }
+
+                $name = $attribute->getName();
+
+                if ($snapshot->blacklist()->isStaticAttributeBlacklisted($className, $name)) {
+                    continue;
+                }
+
+                if (!isset($defaults[$name])) {
+                    continue;
+                }
+
+                $attribute->setAccessible(true);
+                $attribute->setValue($defaults[$name]);
+            }
+        }
+    }
+
+    /**
+     * Restores a super-global variable array from this snapshot.
+     *
+     * @param Snapshot $snapshot
+     * @param $superGlobalArray
+     */
+    private function restoreSuperGlobalArray(Snapshot $snapshot, $superGlobalArray)
+    {
+        $superGlobalVariables = $snapshot->superGlobalVariables();
+
+        if (isset($GLOBALS[$superGlobalArray]) &&
+            is_array($GLOBALS[$superGlobalArray]) &&
+            isset($superGlobalVariables[$superGlobalArray])) {
+            $keys = array_keys(
+                array_merge(
+                    $GLOBALS[$superGlobalArray],
+                    $superGlobalVariables[$superGlobalArray]
+                )
+            );
+
+            foreach ($keys as $key) {
+                if (isset($superGlobalVariables[$superGlobalArray][$key])) {
+                    $GLOBALS[$superGlobalArray][$key] = $superGlobalVariables[$superGlobalArray][$key];
+                } else {
+                    unset($GLOBALS[$superGlobalArray][$key]);
+                }
+            }
+        }
+    }
+}