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<?php declare(strict_types=1);
/*
 * 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.
 */
namespace PHPUnit\Framework\Constraint;

use function sprintf;
use function trim;
use PHPUnit\Framework\ExpectationFailedException;
use PHPUnit\Util\Exporter;
use SebastianBergmann\Comparator\ComparisonFailure;
use SebastianBergmann\Comparator\Factory as ComparatorFactory;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 */
final class IsEqualWithDelta extends Constraint
{
    private readonly mixed $value;
    private readonly float $delta;

public function __construct(mixed $value, float $delta)
    {
        $this->value = $value;
        $this->delta = $delta;
    }

/**
     * 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.
     *
     * @throws ExpectationFailedException
     */
    public function evaluate(mixed $other, string $description = '', bool $returnResult = false): ?bool
    {
        // If $this->value and $other are identical, they are also equal.
        // This is the most common path and will allow us to skip
        // initialization of all the comparators.
        if ($this->value === $other) {
            return true;
        }

$comparatorFactory = ComparatorFactory::getInstance();

try {
            $comparator = $comparatorFactory->getComparatorFor(
                $this->value,
                $other,
            );

$comparator->assertEquals(
                $this->value,
                $other,
                $this->delta,
            );
        } catch (ComparisonFailure $f) {
            if ($returnResult) {
                return false;
            }

throw new ExpectationFailedException(
                trim($description . "\n" . $f->getMessage()),
                $f,
            );
        }

return true;
    }

/**
     * Returns a string representation of the constraint.
     */
    public function toString(bool $exportObjects = false): string
    {
        return sprintf(
            'is equal to %s with delta <%F>',
            Exporter::export($this->value, $exportObjects),
            $this->delta,
        );
    }
}

✏️ Editing: IsEqualWithDelta.php

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