vendor/nesbot/carbon/src/Carbon/Traits/Test.php

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<?php

/**
 * This file is part of the Carbon package.
 *
 * (c) Brian Nesbitt <brian@nesbot.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Carbon\Traits;

use Carbon\CarbonInterface;
use Carbon\CarbonTimeZone;
use Closure;
use DateTimeImmutable;
use DateTimeInterface;
use InvalidArgumentException;
use Throwable;

trait Test
{
    ///////////////////////////////////////////////////////////////////
    ///////////////////////// TESTING AIDS ////////////////////////////
    ///////////////////////////////////////////////////////////////////

    /**
     * A test Carbon instance to be returned when now instances are created.
     *
     * @var Closure|static|null
     */
    protected static $testNow;

    /**
     * The timezone to resto to when clearing the time mock.
     *
     * @var string|null
     */
    protected static $testDefaultTimezone;

    /**
     * Set a Carbon instance (real or mock) to be returned when a "now"
     * instance is created.  The provided instance will be returned
     * specifically under the following conditions:
     *   - A call to the static now() method, ex. Carbon::now()
     *   - When a null (or blank string) is passed to the constructor or parse(), ex. new Carbon(null)
     *   - When the string "now" is passed to the constructor or parse(), ex. new Carbon('now')
     *   - When a string containing the desired time is passed to Carbon::parse().
     *
     * Note the timezone parameter was left out of the examples above and
     * has no affect as the mock value will be returned regardless of its value.
     *
     * Only the moment is mocked with setTestNow(), the timezone will still be the one passed
     * as parameter of date_default_timezone_get() as a fallback (see setTestNowAndTimezone()).
     *
     * To clear the test instance call this method using the default
     * parameter of null.
     *
     * /!\ Use this method for unit tests only.