Add constant assignment check

specs/const/assignment.php

@@ -0,0 +1,99 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the humbug/php-scoper package.
+ *
+ * Copyright (c) 2017 Théo FIDRY <[email protected]>,
+ *                    Pádraic Brady <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+return [
+    'meta' => [
+        'title' => 'Constant assignment',
+        // Default values. If not specified will be the one used
+        'prefix' => 'Humbug',
+
+        'expose-global-constants' => false,
+        'expose-global-classes' => false,
+        'expose-global-functions' => false,
+        'expose-namespaces' => [],
+        'expose-constants' => [],
+        'expose-classes' => [],
+        'expose-functions' => [],
+
+        'exclude-namespaces' => [],
+        'exclude-constants' => [],
+        'exclude-classes' => [],
+        'exclude-functions' => [],
+
+        'expected-recorded-classes' => [],
+        'expected-recorded-functions' => [],
+    ],
+
+    'Constant assignment in the global namespace' => <<<'PHP'
+    <?php
+
+    $x = DIRECTORY_SEPARATOR;
+    $x = Client::class;
+    $x = Client::VERSION;
+    $x = \Client::class;
+    $x = \Client::VERSION;
+    $x = Guzzle\Client::class;
+    $x = Guzzle\Client::VERSION;
+    $x = \Guzzle\Client::class;
+    $x = \Guzzle\Client::VERSION;
+
+    ----
+    <?php
+
+    namespace Humbug;
+
+    $x = \DIRECTORY_SEPARATOR;
+    $x = Client::class;
+    $x = Client::VERSION;
+    $x = \Humbug\Client::class;
+    $x = \Humbug\Client::VERSION;
+    $x = Guzzle\Client::class;
+    $x = Guzzle\Client::VERSION;
+    $x = \Humbug\Guzzle\Client::class;
+    $x = \Humbug\Guzzle\Client::VERSION;
+
+    PHP,
+
+    'Constant assignment in a namespace' => <<<'PHP'
+    <?php
+
+    namespace Acme;
+
+    $x = DIRECTORY_SEPARATOR;
+    $x = Client::class;
+    $x = Client::VERSION;
+    $x = \Client::class;
+    $x = \Client::VERSION;
+    $x = Guzzle\Client::class;
+    $x = Guzzle\Client::VERSION;
+    $x = \Guzzle\Client::class;
+    $x = \Guzzle\Client::VERSION;
+
+    ----
+    <?php
+
+    namespace Humbug\Acme;
+
+    $x = \DIRECTORY_SEPARATOR;
+    $x = Client::class;
+    $x = Client::VERSION;
+    $x = \Humbug\Client::class;
+    $x = \Humbug\Client::VERSION;
+    $x = Guzzle\Client::class;
+    $x = Guzzle\Client::VERSION;
+    $x = \Humbug\Guzzle\Client::class;
+    $x = \Humbug\Guzzle\Client::VERSION;
+
+    PHP,
+];