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diff --git a/vendor/phpunit/phpunit/src/Framework/Constraint/ArrayHasKey.php b/vendor/phpunit/phpunit/src/Framework/Constraint/ArrayHasKey.php
new file mode 100644
index 000000000..f208b709c
--- /dev/null
+++ b/vendor/phpunit/phpunit/src/Framework/Constraint/ArrayHasKey.php
@@ -0,0 +1,82 @@
+<?php
+/*
+ * This file is part of PHPUnit.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Constraint that asserts that the array it is evaluated for has a given key.
+ *
+ * Uses array_key_exists() to check if the key is found in the input array, if
+ * not found the evaluation fails.
+ *
+ * The array key is passed in the constructor.
+ *
+ * @since Class available since Release 3.0.0
+ */
+class PHPUnit_Framework_Constraint_ArrayHasKey extends PHPUnit_Framework_Constraint
+{
+    /**
+     * @var int|string
+     */
+    protected $key;
+
+    /**
+     * @param int|string $key
+     */
+    public function __construct($key)
+    {
+        parent::__construct();
+        $this->key = $key;
+    }
+
+    /**
+     * Evaluates the constraint for parameter $other. Returns true if the
+     * constraint is met, false otherwise.
+     *
+     * @param mixed $other Value or object to evaluate.
+     *
+     * @return bool
+     */
+    protected function matches($other)
+    {
+        if (is_array($other)) {
+            return array_key_exists($this->key, $other);
+        }
+
+        if ($other instanceof ArrayAccess) {
+            return $other->offsetExists($this->key);
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns a string representation of the constraint.
+     *
+     * @return string
+     */
+    public function toString()
+    {
+        return 'has the key ' . $this->exporter->export($this->key);
+    }
+
+    /**
+     * Returns the description of the failure
+     *
+     * The beginning of failure messages is "Failed asserting that" in most
+     * cases. This method should return the second part of that sentence.
+     *
+     * @param mixed $other Evaluated value or object.
+     *
+     * @return string
+     */
+    protected function failureDescription($other)
+    {
+        return 'an array ' . $this->toString();
+    }
+}