* add phpunit as a dev dependency

 * add some basic tests for UrlHelper::rewrite_relative()
 * fix UrlHelper::rewrite_relative() to work better on non-absolute
   relative URL paths

10 files changed, 1027 insertions, 0 deletions

diff --git a/vendor/sebastian/global-state/ChangeLog.md b/vendor/sebastian/global-state/ChangeLog.md
new file mode 100644
index 000000000..a27a5cf16
--- /dev/null
+++ b/vendor/sebastian/global-state/ChangeLog.md
@@ -0,0 +1,79 @@
+# Changes in sebastian/global-state
+
+All notable changes in `sebastian/global-state` are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
+
+## [5.0.5] - 2022-02-14
+
+### Fixed
+
+* [#34](https://github.com/sebastianbergmann/global-state/pull/34): Uninitialised typed static properties are not handled correctly
+
+## [5.0.4] - 2022-02-10
+
+### Fixed
+
+* The `$includeTraits` parameter of `SebastianBergmann\GlobalState\Snapshot::__construct()` is not respected
+
+## [5.0.3] - 2021-06-11
+
+### Changed
+
+* `SebastianBergmann\GlobalState\CodeExporter::globalVariables()` now generates code that is compatible with PHP 8.1
+
+## [5.0.2] - 2020-10-26
+
+### Fixed
+
+* `SebastianBergmann\GlobalState\Exception` now correctly extends `\Throwable`
+
+## [5.0.1] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [5.0.0] - 2020-08-07
+
+### Changed
+
+* The `SebastianBergmann\GlobalState\Blacklist` class has been renamed to `SebastianBergmann\GlobalState\ExcludeList`
+
+## [4.0.0] - 2020-02-07
+
+### Removed
+
+* This component is no longer supported on PHP 7.2
+
+## [3.0.2] - 2022-02-10
+
+### Fixed
+
+* The `$includeTraits` parameter of `SebastianBergmann\GlobalState\Snapshot::__construct()` is not respected
+
+## [3.0.1] - 2020-11-30
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.2` to `>=7.2`
+
+## [3.0.0] - 2019-02-01
+
+### Changed
+
+* `Snapshot::canBeSerialized()` now recursively checks arrays and object graphs for variables that cannot be serialized
+
+### Removed
+
+* This component is no longer supported on PHP 7.0 and PHP 7.1
+
+[5.0.5]: https://github.com/sebastianbergmann/global-state/compare/5.0.4...5.0.5
+[5.0.4]: https://github.com/sebastianbergmann/global-state/compare/5.0.3...5.0.4
+[5.0.3]: https://github.com/sebastianbergmann/global-state/compare/5.0.2...5.0.3
+[5.0.2]: https://github.com/sebastianbergmann/global-state/compare/5.0.1...5.0.2
+[5.0.1]: https://github.com/sebastianbergmann/global-state/compare/5.0.0...5.0.1
+[5.0.0]: https://github.com/sebastianbergmann/global-state/compare/4.0.0...5.0.0
+[4.0.0]: https://github.com/sebastianbergmann/global-state/compare/3.0.2...4.0.0
+[3.0.2]: https://github.com/sebastianbergmann/phpunit/compare/3.0.1...3.0.2
+[3.0.1]: https://github.com/sebastianbergmann/phpunit/compare/3.0.0...3.0.1
+[3.0.0]: https://github.com/sebastianbergmann/phpunit/compare/2.0.0...3.0.0
+
diff --git a/vendor/sebastian/global-state/LICENSE b/vendor/sebastian/global-state/LICENSE
new file mode 100644
index 000000000..240190bd3
--- /dev/null
+++ b/vendor/sebastian/global-state/LICENSE
@@ -0,0 +1,33 @@
+sebastian/global-state
+
+Copyright (c) 2001-2022, Sebastian Bergmann <[email protected]>.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+ * Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in
+   the documentation and/or other materials provided with the
+   distribution.
+
+ * Neither the name of Sebastian Bergmann nor the names of his
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/sebastian/global-state/README.md b/vendor/sebastian/global-state/README.md
new file mode 100644
index 000000000..af15bedde
--- /dev/null
+++ b/vendor/sebastian/global-state/README.md
@@ -0,0 +1,20 @@
+# sebastian/global-state
+
+[![CI Status](https://github.com/sebastianbergmann/global-state/workflows/CI/badge.svg)](https://github.com/sebastianbergmann/global-state/actions)
+[![Type Coverage](https://shepherd.dev/github/sebastianbergmann/global-state/coverage.svg)](https://shepherd.dev/github/sebastianbergmann/global-state)
+
+Snapshotting of global state, factored out of PHPUnit into a stand-alone component.
+
+## Installation
+
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
+
+```
+composer require sebastian/global-state
+```
+
+If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
+
+```
+composer require --dev sebastian/global-state
+```
diff --git a/vendor/sebastian/global-state/composer.json b/vendor/sebastian/global-state/composer.json
new file mode 100644
index 000000000..0fef446a6
--- /dev/null
+++ b/vendor/sebastian/global-state/composer.json
@@ -0,0 +1,51 @@
+{
+    "name": "sebastian/global-state",
+    "description": "Snapshotting of global state",
+    "keywords": ["global state"],
+    "homepage": "http://www.github.com/sebastianbergmann/global-state",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Sebastian Bergmann",
+            "email": "[email protected]"
+        }
+    ],
+    "prefer-stable": true,
+    "config": {
+        "platform": {
+            "php": "7.3.0"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
+    "require": {
+        "php": ">=7.3",
+        "sebastian/object-reflector": "^2.0",
+        "sebastian/recursion-context": "^4.0"
+    },
+    "require-dev": {
+        "ext-dom": "*",
+        "phpunit/phpunit": "^9.3"
+    },
+    "suggest": {
+        "ext-uopz": "*"
+    },
+    "autoload": {
+        "classmap": [
+            "src/"
+        ]
+    },
+    "autoload-dev": {
+        "classmap": [
+            "tests/_fixture/"
+        ],
+        "files": [
+            "tests/_fixture/SnapshotFunctions.php"
+        ]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "5.0-dev"
+        }
+    }
+}
diff --git a/vendor/sebastian/global-state/src/CodeExporter.php b/vendor/sebastian/global-state/src/CodeExporter.php
new file mode 100644
index 000000000..71cdbf504
--- /dev/null
+++ b/vendor/sebastian/global-state/src/CodeExporter.php
@@ -0,0 +1,109 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+use const PHP_EOL;
+use function is_array;
+use function is_scalar;
+use function serialize;
+use function sprintf;
+use function var_export;
+
+/**
+ * Exports parts of a Snapshot as PHP code.
+ */
+final class CodeExporter
+{
+    public function constants(Snapshot $snapshot): string
+    {
+        $result = '';
+
+        foreach ($snapshot->constants() as $name => $value) {
+            $result .= sprintf(
+                'if (!defined(\'%s\')) define(\'%s\', %s);' . "\n",
+                $name,
+                $name,
+                $this->exportVariable($value)
+            );
+        }
+
+        return $result;
+    }
+
+    public function globalVariables(Snapshot $snapshot): string
+    {
+        $result = <<<'EOT'
+call_user_func(
+    function ()
+    {
+        foreach (array_keys($GLOBALS) as $key) {
+            unset($GLOBALS[$key]);
+        }
+    }
+);
+
+
+EOT;
+
+        foreach ($snapshot->globalVariables() as $name => $value) {
+            $result .= sprintf(
+                '$GLOBALS[%s] = %s;' . PHP_EOL,
+                $this->exportVariable($name),
+                $this->exportVariable($value)
+            );
+        }
+
+        return $result;
+    }
+
+    public function iniSettings(Snapshot $snapshot): string
+    {
+        $result = '';
+
+        foreach ($snapshot->iniSettings() as $key => $value) {
+            $result .= sprintf(
+                '@ini_set(%s, %s);' . "\n",
+                $this->exportVariable($key),
+                $this->exportVariable($value)
+            );
+        }
+
+        return $result;
+    }
+
+    private function exportVariable($variable): string
+    {
+        if (is_scalar($variable) || null === $variable ||
+            (is_array($variable) && $this->arrayOnlyContainsScalars($variable))) {
+            return var_export($variable, true);
+        }
+
+        return 'unserialize(' . var_export(serialize($variable), true) . ')';
+    }
+
+    private function arrayOnlyContainsScalars(array $array): bool
+    {
+        $result = true;
+
+        foreach ($array as $element) {
+            if (is_array($element)) {
+                $result = $this->arrayOnlyContainsScalars($element);
+            } elseif (!is_scalar($element) && null !== $element) {
+                $result = false;
+            }
+
+            if ($result === false) {
+                break;
+            }
+        }
+
+        return $result;
+    }
+}
diff --git a/vendor/sebastian/global-state/src/ExcludeList.php b/vendor/sebastian/global-state/src/ExcludeList.php
new file mode 100644
index 000000000..5631f1186
--- /dev/null
+++ b/vendor/sebastian/global-state/src/ExcludeList.php
@@ -0,0 +1,119 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+use function in_array;
+use function strpos;
+use ReflectionClass;
+
+final class ExcludeList
+{
+    /**
+     * @var array
+     */
+    private $globalVariables = [];
+
+    /**
+     * @var string[]
+     */
+    private $classes = [];
+
+    /**
+     * @var string[]
+     */
+    private $classNamePrefixes = [];
+
+    /**
+     * @var string[]
+     */
+    private $parentClasses = [];
+
+    /**
+     * @var string[]
+     */
+    private $interfaces = [];
+
+    /**
+     * @var array
+     */
+    private $staticAttributes = [];
+
+    public function addGlobalVariable(string $variableName): void
+    {
+        $this->globalVariables[$variableName] = true;
+    }
+
+    public function addClass(string $className): void
+    {
+        $this->classes[] = $className;
+    }
+
+    public function addSubclassesOf(string $className): void
+    {
+        $this->parentClasses[] = $className;
+    }
+
+    public function addImplementorsOf(string $interfaceName): void
+    {
+        $this->interfaces[] = $interfaceName;
+    }
+
+    public function addClassNamePrefix(string $classNamePrefix): void
+    {
+        $this->classNamePrefixes[] = $classNamePrefix;
+    }
+
+    public function addStaticAttribute(string $className, string $attributeName): void
+    {
+        if (!isset($this->staticAttributes[$className])) {
+            $this->staticAttributes[$className] = [];
+        }
+
+        $this->staticAttributes[$className][$attributeName] = true;
+    }
+
+    public function isGlobalVariableExcluded(string $variableName): bool
+    {
+        return isset($this->globalVariables[$variableName]);
+    }
+
+    public function isStaticAttributeExcluded(string $className, string $attributeName): bool
+    {
+        if (in_array($className, $this->classes, true)) {
+            return true;
+        }
+
+        foreach ($this->classNamePrefixes as $prefix) {
+            if (strpos($className, $prefix) === 0) {
+                return true;
+            }
+        }
+
+        $class = new ReflectionClass($className);
+
+        foreach ($this->parentClasses as $type) {
+            if ($class->isSubclassOf($type)) {
+                return true;
+            }
+        }
+
+        foreach ($this->interfaces as $type) {
+            if ($class->implementsInterface($type)) {
+                return true;
+            }
+        }
+
+        if (isset($this->staticAttributes[$className][$attributeName])) {
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/vendor/sebastian/global-state/src/Restorer.php b/vendor/sebastian/global-state/src/Restorer.php
new file mode 100644
index 000000000..1633fcc11
--- /dev/null
+++ b/vendor/sebastian/global-state/src/Restorer.php
@@ -0,0 +1,143 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+use function array_diff;
+use function array_key_exists;
+use function array_keys;
+use function array_merge;
+use function function_exists;
+use function get_defined_functions;
+use function in_array;
+use function is_array;
+use ReflectionClass;
+use ReflectionProperty;
+
+/**
+ * Restorer of snapshots of global state.
+ */
+class Restorer
+{
+    /**
+     * Deletes function definitions that are not defined in a snapshot.
+     *
+     * @throws RuntimeException when the uopz_delete() function is not available
+     *
+     * @see https://github.com/krakjoe/uopz
+     */
+    public function restoreFunctions(Snapshot $snapshot): void
+    {
+        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.
+     */
+    public function restoreGlobalVariables(Snapshot $snapshot): void
+    {
+        $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, $superGlobalArrays, true) &&
+                !$snapshot->excludeList()->isGlobalVariableExcluded($key)) {
+                if (array_key_exists($key, $globalVariables)) {
+                    $GLOBALS[$key] = $globalVariables[$key];
+                } else {
+                    unset($GLOBALS[$key]);
+                }
+            }
+        }
+    }
+
+    /**
+     * Restores all static attributes in user-defined classes from this snapshot.
+     */
+    public function restoreStaticAttributes(Snapshot $snapshot): void
+    {
+        $current    = new Snapshot($snapshot->excludeList(), 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->excludeList()->isStaticAttributeExcluded($className, $name)) {
+                    continue;
+                }
+
+                if (!isset($defaults[$name])) {
+                    continue;
+                }
+
+                $attribute->setAccessible(true);
+                $attribute->setValue($defaults[$name]);
+            }
+        }
+    }
+
+    /**
+     * Restores a super-global variable array from this snapshot.
+     */
+    private function restoreSuperGlobalArray(Snapshot $snapshot, string $superGlobalArray): void
+    {
+        $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]);
+                }
+            }
+        }
+    }
+}
diff --git a/vendor/sebastian/global-state/src/Snapshot.php b/vendor/sebastian/global-state/src/Snapshot.php
new file mode 100644
index 000000000..e33264eb0
--- /dev/null
+++ b/vendor/sebastian/global-state/src/Snapshot.php
@@ -0,0 +1,443 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+use const PHP_VERSION_ID;
+use function array_keys;
+use function array_merge;
+use function array_reverse;
+use function func_get_args;
+use function get_declared_classes;
+use function get_declared_interfaces;
+use function get_declared_traits;
+use function get_defined_constants;
+use function get_defined_functions;
+use function get_included_files;
+use function in_array;
+use function ini_get_all;
+use function is_array;
+use function is_object;
+use function is_resource;
+use function is_scalar;
+use function serialize;
+use function unserialize;
+use ReflectionClass;
+use SebastianBergmann\ObjectReflector\ObjectReflector;
+use SebastianBergmann\RecursionContext\Context;
+use Throwable;
+
+/**
+ * A snapshot of global state.
+ */
+class Snapshot
+{
+    /**
+     * @var ExcludeList
+     */
+    private $excludeList;
+
+    /**
+     * @var array
+     */
+    private $globalVariables = [];
+
+    /**
+     * @var array
+     */
+    private $superGlobalArrays = [];
+
+    /**
+     * @var array
+     */
+    private $superGlobalVariables = [];
+
+    /**
+     * @var array
+     */
+    private $staticAttributes = [];
+
+    /**
+     * @var array
+     */
+    private $iniSettings = [];
+
+    /**
+     * @var array
+     */
+    private $includedFiles = [];
+
+    /**
+     * @var array
+     */
+    private $constants = [];
+
+    /**
+     * @var array
+     */
+    private $functions = [];
+
+    /**
+     * @var array
+     */
+    private $interfaces = [];
+
+    /**
+     * @var array
+     */
+    private $classes = [];
+
+    /**
+     * @var array
+     */
+    private $traits = [];
+
+    /**
+     * Creates a snapshot of the current global state.
+     */
+    public function __construct(ExcludeList $excludeList = null, bool $includeGlobalVariables = true, bool $includeStaticAttributes = true, bool $includeConstants = true, bool $includeFunctions = true, bool $includeClasses = true, bool $includeInterfaces = true, bool $includeTraits = true, bool $includeIniSettings = true, bool $includeIncludedFiles = true)
+    {
+        $this->excludeList = $excludeList ?: new ExcludeList;
+
+        if ($includeConstants) {
+            $this->snapshotConstants();
+        }
+
+        if ($includeFunctions) {
+            $this->snapshotFunctions();
+        }
+
+        if ($includeClasses || $includeStaticAttributes) {
+            $this->snapshotClasses();
+        }
+
+        if ($includeInterfaces) {
+            $this->snapshotInterfaces();
+        }
+
+        if ($includeGlobalVariables) {
+            $this->setupSuperGlobalArrays();
+            $this->snapshotGlobals();
+        }
+
+        if ($includeStaticAttributes) {
+            $this->snapshotStaticAttributes();
+        }
+
+        if ($includeIniSettings) {
+            $this->iniSettings = ini_get_all(null, false);
+        }
+
+        if ($includeIncludedFiles) {
+            $this->includedFiles = get_included_files();
+        }
+
+        if ($includeTraits) {
+            $this->traits = get_declared_traits();
+        }
+    }
+
+    public function excludeList(): ExcludeList
+    {
+        return $this->excludeList;
+    }
+
+    public function globalVariables(): array
+    {
+        return $this->globalVariables;
+    }
+
+    public function superGlobalVariables(): array
+    {
+        return $this->superGlobalVariables;
+    }
+
+    public function superGlobalArrays(): array
+    {
+        return $this->superGlobalArrays;
+    }
+
+    public function staticAttributes(): array
+    {
+        return $this->staticAttributes;
+    }
+
+    public function iniSettings(): array
+    {
+        return $this->iniSettings;
+    }
+
+    public function includedFiles(): array
+    {
+        return $this->includedFiles;
+    }
+
+    public function constants(): array
+    {
+        return $this->constants;
+    }
+
+    public function functions(): array
+    {
+        return $this->functions;
+    }
+
+    public function interfaces(): array
+    {
+        return $this->interfaces;
+    }
+
+    public function classes(): array
+    {
+        return $this->classes;
+    }
+
+    public function traits(): array
+    {
+        return $this->traits;
+    }
+
+    /**
+     * Creates a snapshot user-defined constants.
+     */
+    private function snapshotConstants(): void
+    {
+        $constants = get_defined_constants(true);
+
+        if (isset($constants['user'])) {
+            $this->constants = $constants['user'];
+        }
+    }
+
+    /**
+     * Creates a snapshot user-defined functions.
+     */
+    private function snapshotFunctions(): void
+    {
+        $functions = get_defined_functions();
+
+        $this->functions = $functions['user'];
+    }
+
+    /**
+     * Creates a snapshot user-defined classes.
+     */
+    private function snapshotClasses(): void
+    {
+        foreach (array_reverse(get_declared_classes()) as $className) {
+            $class = new ReflectionClass($className);
+
+            if (!$class->isUserDefined()) {
+                break;
+            }
+
+            $this->classes[] = $className;
+        }
+
+        $this->classes = array_reverse($this->classes);
+    }
+
+    /**
+     * Creates a snapshot user-defined interfaces.
+     */
+    private function snapshotInterfaces(): void
+    {
+        foreach (array_reverse(get_declared_interfaces()) as $interfaceName) {
+            $class = new ReflectionClass($interfaceName);
+
+            if (!$class->isUserDefined()) {
+                break;
+            }
+
+            $this->interfaces[] = $interfaceName;
+        }
+
+        $this->interfaces = array_reverse($this->interfaces);
+    }
+
+    /**
+     * Creates a snapshot of all global and super-global variables.
+     */
+    private function snapshotGlobals(): void
+    {
+        $superGlobalArrays = $this->superGlobalArrays();
+
+        foreach ($superGlobalArrays as $superGlobalArray) {
+            $this->snapshotSuperGlobalArray($superGlobalArray);
+        }
+
+        foreach (array_keys($GLOBALS) as $key) {
+            if ($key !== 'GLOBALS' &&
+                !in_array($key, $superGlobalArrays, true) &&
+                $this->canBeSerialized($GLOBALS[$key]) &&
+                !$this->excludeList->isGlobalVariableExcluded($key)) {
+                /* @noinspection UnserializeExploitsInspection */
+                $this->globalVariables[$key] = unserialize(serialize($GLOBALS[$key]));
+            }
+        }
+    }
+
+    /**
+     * Creates a snapshot a super-global variable array.
+     */
+    private function snapshotSuperGlobalArray(string $superGlobalArray): void
+    {
+        $this->superGlobalVariables[$superGlobalArray] = [];
+
+        if (isset($GLOBALS[$superGlobalArray]) && is_array($GLOBALS[$superGlobalArray])) {
+            foreach ($GLOBALS[$superGlobalArray] as $key => $value) {
+                /* @noinspection UnserializeExploitsInspection */
+                $this->superGlobalVariables[$superGlobalArray][$key] = unserialize(serialize($value));
+            }
+        }
+    }
+
+    /**
+     * Creates a snapshot of all static attributes in user-defined classes.
+     */
+    private function snapshotStaticAttributes(): void
+    {
+        foreach ($this->classes as $className) {
+            $class    = new ReflectionClass($className);
+            $snapshot = [];
+
+            foreach ($class->getProperties() as $attribute) {
+                if ($attribute->isStatic()) {
+                    $name = $attribute->getName();
+
+                    if ($this->excludeList->isStaticAttributeExcluded($className, $name)) {
+                        continue;
+                    }
+
+                    $attribute->setAccessible(true);
+
+                    if (PHP_VERSION_ID >= 70400 && !$attribute->isInitialized()) {
+                        continue;
+                    }
+
+                    $value = $attribute->getValue();
+
+                    if ($this->canBeSerialized($value)) {
+                        /* @noinspection UnserializeExploitsInspection */
+                        $snapshot[$name] = unserialize(serialize($value));
+                    }
+                }
+            }
+
+            if (!empty($snapshot)) {
+                $this->staticAttributes[$className] = $snapshot;
+            }
+        }
+    }
+
+    /**
+     * Returns a list of all super-global variable arrays.
+     */
+    private function setupSuperGlobalArrays(): void
+    {
+        $this->superGlobalArrays = [
+            '_ENV',
+            '_POST',
+            '_GET',
+            '_COOKIE',
+            '_SERVER',
+            '_FILES',
+            '_REQUEST',
+        ];
+    }
+
+    private function canBeSerialized($variable): bool
+    {
+        if (is_scalar($variable) || $variable === null) {
+            return true;
+        }
+
+        if (is_resource($variable)) {
+            return false;
+        }
+
+        foreach ($this->enumerateObjectsAndResources($variable) as $value) {
+            if (is_resource($value)) {
+                return false;
+            }
+
+            if (is_object($value)) {
+                $class = new ReflectionClass($value);
+
+                if ($class->isAnonymous()) {
+                    return false;
+                }
+
+                try {
+                    @serialize($value);
+                } catch (Throwable $t) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
+    private function enumerateObjectsAndResources($variable): array
+    {
+        if (isset(func_get_args()[1])) {
+            $processed = func_get_args()[1];
+        } else {
+            $processed = new Context;
+        }
+
+        $result = [];
+
+        if ($processed->contains($variable)) {
+            return $result;
+        }
+
+        $array = $variable;
+        $processed->add($variable);
+
+        if (is_array($variable)) {
+            foreach ($array as $element) {
+                if (!is_array($element) && !is_object($element) && !is_resource($element)) {
+                    continue;
+                }
+
+                if (!is_resource($element)) {
+                    /** @noinspection SlowArrayOperationsInLoopInspection */
+                    $result = array_merge(
+                        $result,
+                        $this->enumerateObjectsAndResources($element, $processed)
+                    );
+                } else {
+                    $result[] = $element;
+                }
+            }
+        } else {
+            $result[] = $variable;
+
+            foreach ((new ObjectReflector)->getAttributes($variable) as $value) {
+                if (!is_array($value) && !is_object($value) && !is_resource($value)) {
+                    continue;
+                }
+
+                if (!is_resource($value)) {
+                    /** @noinspection SlowArrayOperationsInLoopInspection */
+                    $result = array_merge(
+                        $result,
+                        $this->enumerateObjectsAndResources($value, $processed)
+                    );
+                } else {
+                    $result[] = $value;
+                }
+            }
+        }
+
+        return $result;
+    }
+}
diff --git a/vendor/sebastian/global-state/src/exceptions/Exception.php b/vendor/sebastian/global-state/src/exceptions/Exception.php
new file mode 100644
index 000000000..94432008e
--- /dev/null
+++ b/vendor/sebastian/global-state/src/exceptions/Exception.php
@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+use Throwable;
+
+interface Exception extends Throwable
+{
+}
diff --git a/vendor/sebastian/global-state/src/exceptions/RuntimeException.php b/vendor/sebastian/global-state/src/exceptions/RuntimeException.php
new file mode 100644
index 000000000..79f02a114
--- /dev/null
+++ b/vendor/sebastian/global-state/src/exceptions/RuntimeException.php
@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/global-state.
+ *
+ * (c) Sebastian Bergmann <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\GlobalState;
+
+final class RuntimeException extends \RuntimeException implements Exception
+{
+}