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diff --git a/vendor/psy/psysh/test/CodeCleaner/ValidConstantPassTest.php b/vendor/psy/psysh/test/CodeCleaner/ValidConstantPassTest.php
new file mode 100644
index 000000000..a6c52e041
--- /dev/null
+++ b/vendor/psy/psysh/test/CodeCleaner/ValidConstantPassTest.php
@@ -0,0 +1,65 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Test\CodeCleaner;
+
+use Psy\CodeCleaner\ValidConstantPass;
+
+class ValidConstantPassTest extends CodeCleanerTestCase
+{
+    public function setUp()
+    {
+        $this->setPass(new ValidConstantPass());
+    }
+
+    /**
+     * @dataProvider getInvalidReferences
+     * @expectedException \Psy\Exception\FatalErrorException
+     */
+    public function testProcessInvalidConstantReferences($code)
+    {
+        $this->parseAndTraverse($code);
+    }
+
+    public function getInvalidReferences()
+    {
+        return [
+            ['Foo\BAR'],
+
+            // class constant fetch
+            ['Psy\Test\CodeCleaner\ValidConstantPassTest::FOO'],
+            ['DateTime::BACON'],
+        ];
+    }
+
+    /**
+     * @dataProvider getValidReferences
+     */
+    public function testProcessValidConstantReferences($code)
+    {
+        $this->parseAndTraverse($code);
+        $this->assertTrue(true);
+    }
+
+    public function getValidReferences()
+    {
+        return [
+            ['PHP_EOL'],
+
+            // class constant fetch
+            ['NotAClass::FOO'],
+            ['DateTime::ATOM'],
+            ['$a = new DateTime; $a::ATOM'],
+            ['DateTime::class'],
+            ['$a = new DateTime; $a::class'],
+        ];
+    }
+}