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<?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 one value is identical to another.
*
* Identical check is performed with PHP's === operator, the operator is
* explained in detail at
* {@url http://www.php.net/manual/en/types.comparisons.php}.
* Two values are identical if they have the same value and are of the same
* type.
*
* The expected value is passed in the constructor.
*
* @since Class available since Release 3.0.0
*/
class PHPUnit_Framework_Constraint_IsIdentical extends PHPUnit_Framework_Constraint
{
/**
* @var float
*/
const EPSILON = 0.0000000001;
/**
* @var mixed
*/
protected $value;
/**
* @param mixed $value
*/
public function __construct($value)
{
parent::__construct();
$this->value = $value;
}
/**
* 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 = '', $returnResult = false)
{
if (is_double($this->value) && is_double($other) &&
!is_infinite($this->value) && !is_infinite($other) &&
!is_nan($this->value) && !is_nan($other)) {
$success = abs($this->value - $other) < self::EPSILON;
} else {
$success = $this->value === $other;
}
if ($returnResult) {
return $success;
}
if (!$success) {
$f = null;
// if both values are strings, make sure a diff is generated
if (is_string($this->value) && is_string($other)) {
$f = new SebastianBergmann\Comparator\ComparisonFailure(
$this->value,
$other,
$this->value,
$other
);
}
$this->fail($other, $description, $f);
}
}
/**
* 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)
{
if (is_object($this->value) && is_object($other)) {
return 'two variables reference the same object';
}
if (is_string($this->value) && is_string($other)) {
return 'two strings are identical';
}
return parent::failureDescription($other);
}
/**
* Returns a string representation of the constraint.
*
* @return string
*/
public function toString()
{
if (is_object($this->value)) {
return 'is identical to an object of class "' .
get_class($this->value) . '"';
} else {
return 'is identical to ' .
$this->exporter->export($this->value);
}
}
}