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diff --git a/vendor/psy/psysh/test/Psy/Test/Readline/GNUReadlineTest.php b/vendor/psy/psysh/test/Psy/Test/Readline/GNUReadlineTest.php
new file mode 100644
index 000000000..45fbb9b58
--- /dev/null
+++ b/vendor/psy/psysh/test/Psy/Test/Readline/GNUReadlineTest.php
@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2017 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Test\Readline;
+
+use Psy\Readline\GNUReadline;
+
+class GNUReadlineTest extends \PHPUnit_Framework_TestCase
+{
+    private $historyFile;
+
+    public function setUp()
+    {
+        if (!GNUReadline::isSupported()) {
+            $this->markTestSkipped('GNUReadline not enabled');
+        }
+
+        $this->historyFile = tempnam(sys_get_temp_dir(), 'psysh_test_history');
+        file_put_contents($this->historyFile, "_HiStOrY_V2_\n");
+    }
+
+    public function testHistory()
+    {
+        $readline = new GNUReadline($this->historyFile);
+        $this->assertEmpty($readline->listHistory());
+        $readline->addHistory('foo');
+        $this->assertEquals(array('foo'), $readline->listHistory());
+        $readline->addHistory('bar');
+        $this->assertEquals(array('foo', 'bar'), $readline->listHistory());
+        $readline->addHistory('baz');
+        $this->assertEquals(array('foo', 'bar', 'baz'), $readline->listHistory());
+        $readline->clearHistory();
+        $this->assertEmpty($readline->listHistory());
+    }
+
+    /**
+     * @depends testHistory
+     */
+    public function testHistorySize()
+    {
+        $readline = new GNUReadline($this->historyFile, 2);
+        $this->assertEmpty($readline->listHistory());
+        $readline->addHistory('foo');
+        $readline->addHistory('bar');
+        $this->assertEquals(array('foo', 'bar'), $readline->listHistory());
+        $readline->addHistory('baz');
+        $this->assertEquals(array('bar', 'baz'), $readline->listHistory());
+        $readline->addHistory('w00t');
+        $this->assertEquals(array('baz', 'w00t'), $readline->listHistory());
+        $readline->clearHistory();
+        $this->assertEmpty($readline->listHistory());
+    }
+
+    /**
+     * @depends testHistory
+     */
+    public function testHistoryEraseDups()
+    {
+        $readline = new GNUReadline($this->historyFile, 0, true);
+        $this->assertEmpty($readline->listHistory());
+        $readline->addHistory('foo');
+        $readline->addHistory('bar');
+        $readline->addHistory('foo');
+        $this->assertEquals(array('bar', 'foo'), $readline->listHistory());
+        $readline->addHistory('baz');
+        $readline->addHistory('w00t');
+        $readline->addHistory('baz');
+        $this->assertEquals(array('bar', 'foo', 'w00t', 'baz'), $readline->listHistory());
+        $readline->clearHistory();
+        $this->assertEmpty($readline->listHistory());
+    }
+}