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diff --git a/vendor/psy/psysh/test/CodeCleaner/FunctionReturnInWriteContextPassTest.php b/vendor/psy/psysh/test/CodeCleaner/FunctionReturnInWriteContextPassTest.php
new file mode 100644
index 000000000..419369b49
--- /dev/null
+++ b/vendor/psy/psysh/test/CodeCleaner/FunctionReturnInWriteContextPassTest.php
@@ -0,0 +1,75 @@
+<?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\FunctionReturnInWriteContextPass;
+use Psy\Exception\FatalErrorException;
+
+class FunctionReturnInWriteContextPassTest extends CodeCleanerTestCase
+{
+    public function setUp()
+    {
+        $this->setPass(new FunctionReturnInWriteContextPass());
+    }
+
+    /**
+     * @dataProvider invalidStatements
+     * @expectedException \Psy\Exception\FatalErrorException
+     * @expectedExceptionMessage Can't use function return value in write context
+     */
+    public function testProcessStatementFails($code)
+    {
+        $this->parseAndTraverse($code);
+    }
+
+    public function invalidStatements()
+    {
+        return [
+            ['f(&g())'],
+            ['array(& $object->method())'],
+            ['$a->method(& $closure())'],
+            ['array(& A::b())'],
+            ['f() = 5'],
+            ['unset(h())'],
+        ];
+    }
+
+    public function testIsset()
+    {
+        try {
+            $this->traverser->traverse($this->parse('isset(strtolower("A"))'));
+            $this->fail();
+        } catch (FatalErrorException $e) {
+            if (version_compare(PHP_VERSION, '5.5', '>=')) {
+                $this->assertContains(
+                    'Cannot use isset() on the result of a function call (you can use "null !== func()" instead)',
+                    $e->getMessage()
+                );
+            } else {
+                $this->assertContains("Can't use function return value in write context", $e->getMessage());
+            }
+        }
+    }
+
+    /**
+     * @expectedException \Psy\Exception\FatalErrorException
+     * @expectedExceptionMessage Can't use function return value in write context
+     */
+    public function testEmpty()
+    {
+        if (version_compare(PHP_VERSION, '5.5', '>=')) {
+            $this->markTestSkipped();
+        }
+
+        $this->traverser->traverse($this->parse('empty(strtolower("A"))'));
+    }
+}