--- /dev/null
+<?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.
+ */
+
+/**
+ * @since Class available since Release 3.1.0
+ */
+class PHPUnit_Framework_Constraint_Attribute extends PHPUnit_Framework_Constraint_Composite
+{
+ /**
+ * @var string
+ */
+ protected $attributeName;
+
+ /**
+ * @param PHPUnit_Framework_Constraint $constraint
+ * @param string $attributeName
+ */
+ public function __construct(PHPUnit_Framework_Constraint $constraint, $attributeName)
+ {
+ parent::__construct($constraint);
+
+ $this->attributeName = $attributeName;
+ }
+
+ /**
+ * Evaluates the constraint for parameter $other
+ *
+ * If $returnResult is set to false (the default), an exception is thrown
+ * in case of a failure. null is returned otherwise.
+ *
+ * If $returnResult is true, the result of the evaluation is returned as
+ * a boolean value instead: true in case of success, false in case of a
+ * failure.
+ *
+ * @param mixed $other Value or object to evaluate.
+ * @param string $description Additional information about the test
+ * @param bool $returnResult Whether to return a result or throw an exception
+ *
+ * @return mixed
+ *
+ * @throws PHPUnit_Framework_ExpectationFailedException
+ */
+ public function evaluate($other, $description = '', $returnResult = false)
+ {
+ return parent::evaluate(
+ PHPUnit_Framework_Assert::readAttribute(
+ $other,
+ $this->attributeName
+ ),
+ $description,
+ $returnResult
+ );
+ }
+
+ /**
+ * Returns a string representation of the constraint.
+ *
+ * @return string
+ */
+ public function toString()
+ {
+ return 'attribute "' . $this->attributeName . '" ' .
+ $this->innerConstraint->toString();
+ }
+
+ /**
+ * 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 $this->toString();
+ }
+}